How To Fit A Rubber Roof?

How To Fit A Rubber Roof
How to Install Rubber Roofing (Step-By-Step)

  • Step 1: Gather Your Tools and Materials First things first, you’ll want to gather all the necessary tools and materials for your project.
  • Step 2: Tear Off Existing Roofing
  • Step 3: Secure the Roofing Deck
  • Step 4: Lay the Insulation
  • Step 5: Lay the Rubber Roofing
  • Step 6: Adhere Appropriately
  • Step 7: Seal the Seams
  • Step 8: Final Check & Clean Up

Does rubber roofing need to be glued?

Time to apply your glue – When you are fitting an EPDM roof, you need to make sure that it is glued down properly. During the membrane application process, you will need to apply two different types of adhesive. The first is a water-based adhesive. Use Permaroof deck adhesive for the best results.

  1. Buy roofing adhesive online.
  2. To apply this, you need to fold back one half of the membrane, before applying the glue to the roof decking.
  3. Do this with a 9″ roller, as this will make sure that the glue is evenly spread and it won’t have any lumps that will be visible underneath the membrane, once it has dried.

Once the water-based adhesive has been applied, Use contact adhesive at the edges. This is much stronger than the water based adhesive and needs to be applied to the edges of the roof. The contact adhesive will dry much more quickly than the water-based adhesive and should be applied to the roof deck and the membrane too. How To Fit A Rubber Roof

What material goes under a rubber roof?

What Can EPDM Be Installed On? – EPDM rubber roofing can be installed to a few different surfaces, but it works best when it adheres to timber deckings such as roofing grade plywood or OSB sterling board. Sometimes EPDM can be bonded to lightweight concrete and other surfaces that are non-porous like fibreglass and tissue faced insulation.

What is the average cost to install a rubber roof?

Rubber Roof Installation Costs – Now let’s get to the real question: how much is this going to cost? The average range of cost to install or replace a rubber roof is between $6,000 and $18,000, with the average being around $12,000. And as you know, all sorts of factors come into play that can affect that price, such as the materials, labor, obstructions, and customizations of the roof.

Membrane Type Average Lifespan Cost Per Sq. Ft. Labor Per Sq. Ft.
TPO 10 to 30 years $1.50 to $5 $2.50 to $9
PVC 10 to 15 years $0.75 to $2.50 $4 to $11
EPDM 20 to 30 years $1 to $4.50 $3.25 to $8

If you are in the market for a new flat roof, definitely consider any of these rubber roof options. They will work great for your new or existing flat roof. For more information, check out our roof replacement services, and contact us right away to get you an estimate and work with you to get started! : Rubber Roof Replacement Cost 2023 (Homeowners Guide)

Does a rubber roof need a pitch?

Recent Buildings.com Roofing News e-newsletters have followed the U.S. Corps of Engineers’ Commentary on Roofing Systems (mainly sections on bituminous and modified bituminous roofing). This column moves on to higher technology roofing – thermoset elastomers, especially ethylene propylene diene monomer rubber (otherwise known as EPDM).

  1. Single-Ply Roofing While built-up roofing (BUR) utilizes multiple layers of reinforcing and field-applied bitumen for the waterproofing, many MB systems use just two factory-coated sheets.
  2. EPDM goes even further, using just single layers of rubber and reduces field seaming by offering sheets in widths up to 50 feet.

Many of these EPDM sheets also eliminate internal reinforcement entirely. While EPDM is the polymer of choice today, other elastomers have been used in the recent past, including butyl rubber, neoprene (chloroprene), polyepichlorohydrin, and Hypalon ® (chlorosulfonated polyethylene or CSPE).

The polymeric component is a blend of polyethylene and polypropylene with a small amount of an unsaturated diene, a monomer that contains multiple double bonds through which cross linking or vulcanization can take place. Carbon black (consisting of extremely fine carbon particles) is added to act as an ultraviolet screening agent, as well as to increase the modulus of elasticity (increased tensile and tear resistance). Inert fillers such as limestone reduce membrane costs. Extending oil permits greater loading of low-cost fillers. Curing agents, processing aids, and catalysts. Fire retardants. UV- or ozone-resisting additives.

While most EPDM sheets are compounded with carbon black, white rubber has been attempted without much success. Currently, if a white roof is desired, a white coating is field applied after the EPDM membrane installation is completed. EPDM membranes may be non-reinforced, generally for ballasted systems, or they may have internal scrim reinforcement for mechanically fastened systems where concentrated stresses are expected.

Typical product thicknesses are 1.1 millimeters (or 0.045 inches), 1.5 millimeters (or 0.060 inches), and 2.2 millimeters (or 0.090 inches). MB sheets are typically 4 millimeters for cap sheets and 3.5 millimeters for base sheets. Fire-retardants sheets are available, but are not required to meet the building code when ballast is to be applied.

Logistics with Rubber Roofing If giant rolls are used, the main advantage is to reduce the number of seams that have to be formed in the field; however, these tarps may weigh 1 ton or more and require special hoisting and transportation techniques so that the deck is not overloaded during construction.

  1. Giant rolls would not be effective on a roof where there are many penetrations, so narrower rolls are used.
  2. Field Conditions Wind can be a real problem, not only when working with the large sheets, but also when adhesive is applied to the substrate.
  3. Debris can blow into the wet adhesive, forming lumps and affecting the quality of bonding to the substrate.

Solvent fumes can carry into occupied spaces, resulting in occupant complaints. This may require shutting down air-intake equipment or constructing temporary elevated intake ducts to avoid problems. With loose-laid ballasted systems, temporary ballast is needed as work progresses so that the roof does not billow or blow off before it is even completed.

For ballasted roof design, refer to ANSI/SPRI document RP-4 (download this for free from the Single Ply Roofing Industry’s website ) that considers wind loading, parapet height, etc. RP-4 is referenced in most U.S. and Canadian building codes. Sheets should be installed so that side-laps of sheets run parallel to the slope or are shingled in such a fashion that water does not “buck” the laps.

If this cannot be avoided, batten strips of rubber can be laid over the seams to add an extra measure of protection. (A minimum slope of 0.25 inches per foot is recommended for all low-slope roofing systems.) For adhered systems, the substrate must be one that is approved by the system supplier.

Higher-density products provide improved impact resistance. Perlite board is not acceptable due to its relative dusty surface and low peel resistance. Newer products such as mineral fiber-based Coverboard ® have a higher density and better peel resistance. Energy Considerations MB and single-ply systems require far less petroleum-based material than traditional bituminous build-up roofing.The most spectacular comparison would be a flood-coat and gravel surfacing on a BUR, which requires 7.5 gallons (60 pounds) of asphalt per roofing square, while a single-ply roof requires none.

While much attention has recently been paid to ENERGY STAR ® reflective surfacings (most of which are white), an excellent case can be made for alternatives such as adding additional thermal insulation, the use of ballast with its increased thermal mass (thermal lag), and protected and vegetated roofs.

  • Aesthetics Aesthetics are typically not much of a concern in low-slope construction.
  • If they are, select ballast and/or paver combinations that are relatively pleasing to the eye.
  • Some concern has been expressed that white membranes may be objectionable due to excess glare and may be slippery when ice films are present.
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(Black membranes look darker when wet while white membranes show no difference in appearance.) Design Considerations and Alerts In loosely laid membranes, some membrane contraction (manifested by pulling away from curbs and walls) has been observed. Both the National Roofing Contractors Association (NRCA) and Midwest Roofing Contractors Association (MRCA) have published guidelines for repairing this condition, titled Repair Methods for Re-Attaching EPDM Membrane and Flashing Experiencing Shrinkage,

  • Newer membrane systems incorporate edge restraint strips (mechanically fastened reinforced rubber strips that are adhered to the field membrane).
  • EPDM membranes are vulnerable to oils, fats, and greases.
  • The membrane will absorb these oils and swell up, as well as become jelly-like.
  • Solutions to this problem include placing grease traps at exhaust vents or the substitution of an oil-resistant elastomer (i.e.

polyepichlorohydrin or Neoprene) in affected roof areas. Fleece-backed EPDM has been used as a separator when the substrate consists of an old bituminous roof containing soft bitumen (e.g. coal-tar pitch, Type I asphalt, asphalt mastic, or a resaturant).

Ballasted systems are limited to a maximum slope of 2 inches per foot (2 percent). Adhered systems using fire-retarded sheets can meet code at virtually any slope to vertical. Experience with EPDM As early as 1980, EPDM had captured 40 to 45 percent of the single-ply market. This is not to say that the EPDM systems have not been improved over this time period.

Flashing material now uses either uncured EPDM or membrane material, replacing uncured neoprene that weathered poorly. Adhesives and primers have also improved, with self-adhesive tape replacing solvent-based neoprene and butyl liquid adhesives. Fleece backing and low-rise adhesives have provided versatility on substrates that were not conducive to mechanically fastened or ballasted systems.

  • Using EPDM in High Wind Exposures ANSI/SPRI RP-4 addresses concerns with all single-ply ballasted roof systems, not just EPDM.
  • In brief, larger ballast stones at greater weight (i.e.20 psf instead of 10 psf) can be used in corners, perimeters, or even the entire roof, when desired.
  • Adding parapets greatly improves both wind resistance and the possibility of wind scour.

ANSI/SPRI FX-1 provides a field test procedure for determining the withdrawal resistance of roofing fasteners from existing roof decks, and ANSI/SPRI ES-1 covers wind design of edge systems. The National Research Council Canada, Institute for Research in Construction (NRC-IRC) has published A Guide for the Wind Design of Mechanically Attached Flexible Membrane Roofs,

  1. Copies of the guide can be ordered from NRC’s virtual store,
  2. Substrates and Underlayments For ballasted systems, molded expanded polystyrene (MEPS) insulation is very cost effective; however, MEPS is vulnerable to heat exposure, so a newly installed black EPDM membrane must be protected with ballast on hot, sunny days to avoid cell collapse of the foam.

For adhered membrane systems, the underlayment must be membrane-supplier approved, as low shear or dusty products could cause bonding problems. In addition, some Isoboard facers have delaminated in service, so membrane suppliers generally require the use of “approved” Isoboard insulations.

  • In regions that experience hailstorms with large hail (greater than 1.5 inches in diameter), higher density substrates have proven effective, as well as the use of thicker membranes (e.g.90 mil instead of 45 mil material).
  • Rounded stone ballast and pavers can also be used to improve impact resistance.

Impermeable substrates or the incorporation of air/vapor barriers reduce the chances of roof flutter, fastener back-out, or membrane fatigue. For roofs exposed to considerable roof traffic, walkways of recycled rubber pads have been used. (It is difficult to walk over large round stones.) Placing fleece padding under concrete pavers is recommended, as the fleece facilitates water migration from under the pavers, reducing the chance for freeze-thaw degradation.

It is good practice to avoid having field-fabricated seams in ponded areas such as at drain sumps. Flashings and Penetrations Vertical flashings for most EPDM systems do not require a cant strip, as the EPDM sheets are very flexible; however, edge restraint and termination bars are used to keep the flashing and membrane in place.

Circular pipe penetrations are weatherproofed by the use of “witches hats” (flexible EPDM boots) that are bonded to the horizontal roof membrane and clamped to the pipe. For multiple or angular penetrations in a small area, pitch-pockets can be used. Instead of the bituminous filler customarily used for BUR and MB systems, curing elastomeric compounds are used (either catalyzed or moisture-curing).

ASTM D4811 – Standard Specification for Nonvulcanized (Uncured) Rubber Sheet Used as Roof Flashing. ASTM D4637 – Standard Specification for EPDM Sheet Used In Single-Ply Roof Membrane. ASTM D6134 – Standard Specification for Vulcanized Rubber Sheets Used in Waterproofing Systems. ASTM D6369 – Standard Guide for Design of Standard Flashing Details for EPDM Roof Membranes. ASTM D6383 – Standard Practice for Time-to-Failure (Creep-Rupture) of Adhesive Joints Fabricated from EPDM Roof Membrane Material. ASTM D6769 – Standard Guide for Application of Fully Adhered, Cold-Applied, Prefabricated Reinforced Modified Bituminous Membrane Waterproofing Systems. ASTM D6950 – Standard Practice for Application of Heat Weldable Atactic Polypropylene (APP) Modified Bituminous Waterproofing Membranes Systems for New Building Decks.

Resources

ASTM Intl. (formerly known as the American Society for Testing and Materials) National Research Council of Canada’s Institute for Research in Construction National Roofing Contractors Association Single Ply Roofing Industry Unified Facilities Criteria: Commentary on Roofing Systems

Does a rubber roof need a fall?

Prepare the roof – Next check the weather. The roof will have to be completely dry, free of dirt, leaves, water, rubbish, oil or anything else which would be loose. The surface cannot be damp in any way as the membrane will not adhere to it. If the rubber is installed and moisture is trapped underneath there is potential for the EPDM to ‘bubble’ (much like a poorly installed car window tint) ruining the installation and your EPDM membrane and possibly your roof could be rendered useless.

Be positive that the roof has at least a 1 to 80 fall. This is the absolute minimum for and EPDM rubber roof (also good practice for any flat roof in general) to prevent ponding. (ponding is the accumulation of water on a roof without it being able to run off anywhere else, creating a dead load on the roof).

This may not seem so difficult if you are or installing a sheet onto a small porch, but with larger flat roofs this becomes a lot more important and somewhat trickier. If you are having difficulty or are sceptical about your installation do call an expert for more advice.

Can you walk on a rubber flat roof?

Can I walk on an EPDM rubber roof? 2022-11-18T15:43:43+00:00

This is during the installation process, further maintenance and using it to access windows for cleaning.However, if you require to walk over the EPDM roof regularly, there are ways to reinforce for surface and ensure that the integrity of the roof isn’t affected by regular foot traffic.At Rubber Roofing Direct, our and are designed to improve the structure of the flat roof and reduce any damage that could be caused by regular use of walking across the surface.

PS Walkway Pads are designed to protect the EPDM membrane from regular foot traffic. They can be applied to the surface using that bonds it to the membrane. Paving Supports are ideal for paving as they are placed directly onto the membrane without any adhesives or fasteners needed.

These modular units can be stacked, allowing you to dictate the height when paving and applying tiles. Yes, you can safely install tiles or slabs on top of an EPDM flat rubber roof. The EPDM membrane can act as a secure base for cement screed to be poured on top of. You will need to ensure a separation layer is placed between the EPDM and screed, allowing you to install tiles or slabs on top of the rubber roof.

This can allow you to use your flat roof as a balcony. We always recommend assessing the structure before looking to make the flat roof a regular walking space. Some extensions may not be designed to actively use the roof as a balcony and may not have the correct structural support : Can I walk on an EPDM rubber roof?

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What is the life expectancy of a rubber roof?

How long will and EPDM rubber roof last? 2022-11-18T16:06:50+00:00 An EPDM rubber roof is incredibly long-lasting and durable. The rubber recycled and used for the synthetic rubber membrane isn’t damaged under the sun’s UV or ultraviolet rays. If installed correctly, you can expect a rubber roof to in excess of up to 50 years.

  • Because an EPDM flat roof is compromised of durable rubber, it can withstand extreme weather conditions such as hail or snow and common weather such as rain and strong winds.
  • Furthermore, if the rubber membrane is ever damaged, torn or split, it’s incredibly easy to quickly repair.
  • It’s common to find a flat rubber roof that has been installed since the 1970s,

That’s why it’s so popular for homeowners. It requires minimal maintenance throughout its lifetime. This is what makes a rubber roof membrane extremely attractive for commercial and privately owned properties. It’s incredibly cost-effective and generally has a longer lifespan compared to traditional materials such as asphalt or felt.

Can I put rubber roof on plywood?

hi here is the specifications for wood applications thank you RVRoofmagic adheres well to all types of wood. If the rubber is applied directly to the wood, however, its appearance will not be uniform because of the differing porosities of the surface. This condition can be avoided by first priming the wood with an oil based primer,

Can you put rubber directly on plywood roof?

Liquid Rubber For Ponds and Plywood Application Liquid Rubber Fix pond leaks. Waterproofing Fish Pond, Leaks Repair, pond liner, Fountains, & Reflecting Pools with Liquid EPDM Rubber Concrete which has not been modified with special additives must be protected by an impervious coatings when used for containing water.

Unprotected concrete will absorb water which can then leach out soluble constituents and cause spalling when frozen. The combination of outdoor exposure plus water immersion creates a demanding environment for a coating. It must have high resistance to water penetration, be flexible enough to withstand extremes in temperature, and not be affected by ultra violet radiation from the sun.

Liquid EPDM rubber coatings possess all this characteristics and are also non toxic to fish. Liquid Rubber Sealant Coating Preparation. Drain water and clean surface dirt while concrete is still wet. High pressure water spray and/or scouring surface with a wire brush may be necessary in fish ponds.

  1. If algae is present treat with an algaecide or 25% solution of bleach, let stand for one hour and rise well.
  2. Allow one week (rain free) for concrete to dry out.
  3. If you are using this in Koi tanks in immersion conditions, make sure you have 2 coats of Liquid EPDM and that you have a full cure.
  4. To do so, let cure in air (without water) for about 1 week in 70 deg F or more ).

Soak and rinse out the tank several times with water before making this ready for the Koi. The soaking and rinsing is to ensure you get out any residue solvents after the curing process. You will of course need to prepare the water for the Koy in whatever normal way you prepare Koi tanks/ponds.

  1. Whether your pond is concrete, plastic or rubber lined.
  2. EPDM Liquid Rubber can fix your leaks troubles.
  3. Plastic pond liners have a tendency to crack or to tear.
  4. There are products such at tapes and caulks that will eventually wear.
  5. EPDM Liquid Rubber, on the will not.
  6. For concrete ponds the easiest solution for leaks are to cover them with a rubber liner but they are tricky to install.

Liquid Rubber Coatings provides an easy one-time solution to your pond leak regardless of if they are made of rubber, concrete or plastic. And yes, it is safe for fish! Liquid Rubber for Coating Plywood: Coatings has been used directly over plywood to make a finished roof in situations where expediency and minimal cost were the primary considerations.

  1. Although this procedure results in a weaker roof structure, water-tightness can be achieved if the application is performed carefully.
  2. The joint between sheets should be positioned directly over a roof truss and securely fastened to prevent warping.
  3. Next, to seal the pores, coat plywood with an oil based primer.

Allow an overnight cure. Seal the joint by bridging it with a 6″ wide polyester fabric strip. Apply a light coat of EPDM rubber over the joint, lay fabric into wet rubber and smooth out wrinkles. Complete job by applying a liberal coat of Liquid Rubber over entire roof surface, being especially careful to completely cover the fabric over the joint without skips or pinholes.

Using an oil base primer on the wood considerably improves the appearance of a one-coat application of Liquid Rubber. Liquid Rubber is excellent for Wood Surfaces Repair Product; Liquid Rubber can be applied to wood. We recommend first applying a primer coat using an oil base primer and then the Liquid Rubber after the primer has dried.

Liquid Rubber can be colored using “universal” colorants available at any paint store. You can add up to one cup per gallon of paint thinner for easier handling when going over wood. Liquid Rubber is slippery when there is only a fine mist of water on its surface.

Is a rubber roof worth it?

How To Fit A Rubber Roof Asphalt roofing is often thought of as the standard choice of materials, but have you ever thought of a rubber roof? Rubber roofing is one of the best options, especially when it comes time to replace your roof. It’s incredibly durable, eco-friendly, and has a long lifespan.

How long does it take for a rubber roof to dry?

The roof should be allowed to dry completely, so plan for downtime to be up to 24 hours. If needed, use a leaf blower to speed up the drying process.

How often do rubber roofs need to be replaced?

Rubber Roofs: 30-50 years.

Does a rubber roof need a pitch?

Recent Buildings.com Roofing News e-newsletters have followed the U.S. Corps of Engineers’ Commentary on Roofing Systems (mainly sections on bituminous and modified bituminous roofing). This column moves on to higher technology roofing – thermoset elastomers, especially ethylene propylene diene monomer rubber (otherwise known as EPDM).

Single-Ply Roofing While built-up roofing (BUR) utilizes multiple layers of reinforcing and field-applied bitumen for the waterproofing, many MB systems use just two factory-coated sheets. EPDM goes even further, using just single layers of rubber and reduces field seaming by offering sheets in widths up to 50 feet.

Many of these EPDM sheets also eliminate internal reinforcement entirely. While EPDM is the polymer of choice today, other elastomers have been used in the recent past, including butyl rubber, neoprene (chloroprene), polyepichlorohydrin, and Hypalon ® (chlorosulfonated polyethylene or CSPE).

The polymeric component is a blend of polyethylene and polypropylene with a small amount of an unsaturated diene, a monomer that contains multiple double bonds through which cross linking or vulcanization can take place. Carbon black (consisting of extremely fine carbon particles) is added to act as an ultraviolet screening agent, as well as to increase the modulus of elasticity (increased tensile and tear resistance). Inert fillers such as limestone reduce membrane costs. Extending oil permits greater loading of low-cost fillers. Curing agents, processing aids, and catalysts. Fire retardants. UV- or ozone-resisting additives.

While most EPDM sheets are compounded with carbon black, white rubber has been attempted without much success. Currently, if a white roof is desired, a white coating is field applied after the EPDM membrane installation is completed. EPDM membranes may be non-reinforced, generally for ballasted systems, or they may have internal scrim reinforcement for mechanically fastened systems where concentrated stresses are expected.

  1. Typical product thicknesses are 1.1 millimeters (or 0.045 inches), 1.5 millimeters (or 0.060 inches), and 2.2 millimeters (or 0.090 inches).
  2. MB sheets are typically 4 millimeters for cap sheets and 3.5 millimeters for base sheets.
  3. Fire-retardants sheets are available, but are not required to meet the building code when ballast is to be applied.

Logistics with Rubber Roofing If giant rolls are used, the main advantage is to reduce the number of seams that have to be formed in the field; however, these tarps may weigh 1 ton or more and require special hoisting and transportation techniques so that the deck is not overloaded during construction.

Giant rolls would not be effective on a roof where there are many penetrations, so narrower rolls are used. Field Conditions Wind can be a real problem, not only when working with the large sheets, but also when adhesive is applied to the substrate. Debris can blow into the wet adhesive, forming lumps and affecting the quality of bonding to the substrate.

Solvent fumes can carry into occupied spaces, resulting in occupant complaints. This may require shutting down air-intake equipment or constructing temporary elevated intake ducts to avoid problems. With loose-laid ballasted systems, temporary ballast is needed as work progresses so that the roof does not billow or blow off before it is even completed.

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For ballasted roof design, refer to ANSI/SPRI document RP-4 (download this for free from the Single Ply Roofing Industry’s website ) that considers wind loading, parapet height, etc. RP-4 is referenced in most U.S. and Canadian building codes. Sheets should be installed so that side-laps of sheets run parallel to the slope or are shingled in such a fashion that water does not “buck” the laps.

If this cannot be avoided, batten strips of rubber can be laid over the seams to add an extra measure of protection. (A minimum slope of 0.25 inches per foot is recommended for all low-slope roofing systems.) For adhered systems, the substrate must be one that is approved by the system supplier.

Higher-density products provide improved impact resistance. Perlite board is not acceptable due to its relative dusty surface and low peel resistance. Newer products such as mineral fiber-based Coverboard ® have a higher density and better peel resistance. Energy Considerations MB and single-ply systems require far less petroleum-based material than traditional bituminous build-up roofing.The most spectacular comparison would be a flood-coat and gravel surfacing on a BUR, which requires 7.5 gallons (60 pounds) of asphalt per roofing square, while a single-ply roof requires none.

While much attention has recently been paid to ENERGY STAR ® reflective surfacings (most of which are white), an excellent case can be made for alternatives such as adding additional thermal insulation, the use of ballast with its increased thermal mass (thermal lag), and protected and vegetated roofs.

Aesthetics Aesthetics are typically not much of a concern in low-slope construction. If they are, select ballast and/or paver combinations that are relatively pleasing to the eye. Some concern has been expressed that white membranes may be objectionable due to excess glare and may be slippery when ice films are present.

(Black membranes look darker when wet while white membranes show no difference in appearance.) Design Considerations and Alerts In loosely laid membranes, some membrane contraction (manifested by pulling away from curbs and walls) has been observed. Both the National Roofing Contractors Association (NRCA) and Midwest Roofing Contractors Association (MRCA) have published guidelines for repairing this condition, titled Repair Methods for Re-Attaching EPDM Membrane and Flashing Experiencing Shrinkage,

  • Newer membrane systems incorporate edge restraint strips (mechanically fastened reinforced rubber strips that are adhered to the field membrane).
  • EPDM membranes are vulnerable to oils, fats, and greases.
  • The membrane will absorb these oils and swell up, as well as become jelly-like.
  • Solutions to this problem include placing grease traps at exhaust vents or the substitution of an oil-resistant elastomer (i.e.

polyepichlorohydrin or Neoprene) in affected roof areas. Fleece-backed EPDM has been used as a separator when the substrate consists of an old bituminous roof containing soft bitumen (e.g. coal-tar pitch, Type I asphalt, asphalt mastic, or a resaturant).

  • Ballasted systems are limited to a maximum slope of 2 inches per foot (2 percent).
  • Adhered systems using fire-retarded sheets can meet code at virtually any slope to vertical.
  • Experience with EPDM As early as 1980, EPDM had captured 40 to 45 percent of the single-ply market.
  • This is not to say that the EPDM systems have not been improved over this time period.

Flashing material now uses either uncured EPDM or membrane material, replacing uncured neoprene that weathered poorly. Adhesives and primers have also improved, with self-adhesive tape replacing solvent-based neoprene and butyl liquid adhesives. Fleece backing and low-rise adhesives have provided versatility on substrates that were not conducive to mechanically fastened or ballasted systems.

  1. Using EPDM in High Wind Exposures ANSI/SPRI RP-4 addresses concerns with all single-ply ballasted roof systems, not just EPDM.
  2. In brief, larger ballast stones at greater weight (i.e.20 psf instead of 10 psf) can be used in corners, perimeters, or even the entire roof, when desired.
  3. Adding parapets greatly improves both wind resistance and the possibility of wind scour.

ANSI/SPRI FX-1 provides a field test procedure for determining the withdrawal resistance of roofing fasteners from existing roof decks, and ANSI/SPRI ES-1 covers wind design of edge systems. The National Research Council Canada, Institute for Research in Construction (NRC-IRC) has published A Guide for the Wind Design of Mechanically Attached Flexible Membrane Roofs,

Copies of the guide can be ordered from NRC’s virtual store, Substrates and Underlayments For ballasted systems, molded expanded polystyrene (MEPS) insulation is very cost effective; however, MEPS is vulnerable to heat exposure, so a newly installed black EPDM membrane must be protected with ballast on hot, sunny days to avoid cell collapse of the foam.

For adhered membrane systems, the underlayment must be membrane-supplier approved, as low shear or dusty products could cause bonding problems. In addition, some Isoboard facers have delaminated in service, so membrane suppliers generally require the use of “approved” Isoboard insulations.

  1. In regions that experience hailstorms with large hail (greater than 1.5 inches in diameter), higher density substrates have proven effective, as well as the use of thicker membranes (e.g.90 mil instead of 45 mil material).
  2. Rounded stone ballast and pavers can also be used to improve impact resistance.

Impermeable substrates or the incorporation of air/vapor barriers reduce the chances of roof flutter, fastener back-out, or membrane fatigue. For roofs exposed to considerable roof traffic, walkways of recycled rubber pads have been used. (It is difficult to walk over large round stones.) Placing fleece padding under concrete pavers is recommended, as the fleece facilitates water migration from under the pavers, reducing the chance for freeze-thaw degradation.

It is good practice to avoid having field-fabricated seams in ponded areas such as at drain sumps. Flashings and Penetrations Vertical flashings for most EPDM systems do not require a cant strip, as the EPDM sheets are very flexible; however, edge restraint and termination bars are used to keep the flashing and membrane in place.

Circular pipe penetrations are weatherproofed by the use of “witches hats” (flexible EPDM boots) that are bonded to the horizontal roof membrane and clamped to the pipe. For multiple or angular penetrations in a small area, pitch-pockets can be used. Instead of the bituminous filler customarily used for BUR and MB systems, curing elastomeric compounds are used (either catalyzed or moisture-curing).

ASTM D4811 – Standard Specification for Nonvulcanized (Uncured) Rubber Sheet Used as Roof Flashing. ASTM D4637 – Standard Specification for EPDM Sheet Used In Single-Ply Roof Membrane. ASTM D6134 – Standard Specification for Vulcanized Rubber Sheets Used in Waterproofing Systems. ASTM D6369 – Standard Guide for Design of Standard Flashing Details for EPDM Roof Membranes. ASTM D6383 – Standard Practice for Time-to-Failure (Creep-Rupture) of Adhesive Joints Fabricated from EPDM Roof Membrane Material. ASTM D6769 – Standard Guide for Application of Fully Adhered, Cold-Applied, Prefabricated Reinforced Modified Bituminous Membrane Waterproofing Systems. ASTM D6950 – Standard Practice for Application of Heat Weldable Atactic Polypropylene (APP) Modified Bituminous Waterproofing Membranes Systems for New Building Decks.

Resources

ASTM Intl. (formerly known as the American Society for Testing and Materials) National Research Council of Canada’s Institute for Research in Construction National Roofing Contractors Association Single Ply Roofing Industry Unified Facilities Criteria: Commentary on Roofing Systems

Can you do a flat roof yourself?

As the fitting process does incorporate the use of naked flames, it may be dangerous to attempt DIY installation without the correct training. Most feel that leaving the job to a professional is the safest option as it does depend on the level of experience you have with this type of flat roofing material.