How To Waterproof A Shed Roof?

How To Waterproof A Shed Roof
Download Article Keep the elements and rough weather out of your shed with these simple solutions Download Article Sheds are not always as hardy as other buildings against bad weather, so applying some weatherproofing features is a good idea. For new sheds, building it off the ground is the place to start. Waterproof paint for the outside and insulation for the inside of the shed are good ways to keep moisture from soaking into the wood.

  1. 1 Build the shed up off of the ground. If you are building a new shed, it is important to build it on supports rather than directly on the ground. Use cinder blocks or other stone shed supports, or use treated wood to build a framework that keeps it off of the ground.
    • Building the shed on supports keeps groundwater from soaking into it.
    • Your options are limited if your shed is already sitting directly on the ground. You could use heavy machinery to lift the shed and then add a support structure under the shed.
    • Most sheds installed by professionals are built up off of the ground.
  2. 2 Paint the outside with waterproof paint. Go to the hardware store and look in the paint aisle or speak to an employee. Choose an exterior paint that is specifically labelled as waterproof. Paint the entire exterior of the shed, including all four sides and the roof.
    • This creates a water-repelling barrier so the water is not absorbed.
    • If you are painting in conjunction with felting the roof, paint the roof in between cleaning the roof and applying the new felt.


  3. 3 Caulk gaps in the shed’s main structure. Grab a caulking gun and some all-purpose, exterior caulk. Look carefully for gaps at the corners and edges of the shed. Check the walls and the ceiling for holes or spaces between boards. Fill any gaps that you find with caulk.
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  1. 1 Check that the doors and windows are sealed. Always close the doors, and check to make sure they fit against the shed tightly so that nothing gets in. If there are windows that open, make sure they are shut tight any time you are away from the shed. Look around doors and windows for gaps that need to be filled.
  2. 2 Apply weatherstripping around windows and doors. If your windows and doors don’t already have foam seals around them, add some. Foam weatherstripping usually comes in a roll and is easy to apply around door frames and windows. It creates a seal for gaps between doors and windows and the frame of the building.
  3. 3 Insulate the inside of the shed. Insulation creates a waterproof layer around the inside structure of the shed. Staple insulation to the support studs of the shed, not to the outside paneling. Insulate the roof, as well as the walls.
    • Bubble wrap is a cheap and effective way to insulate a shed, but you can also use standard fiberglass insulation.
    • Stapling insulation to the studs creates a small air pocket between the outer paneling and the insulation, which helps reduce moisture.
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  1. 1 Measure the area of the roof. Measure the length and width of one side of the roof. Multiply those numbers to get the area of that side. If the shed is a basic A-frame, multiply that number by two to get the total area of the roof. If the roof has an irregular shape, find the area of each part of the roof.
    • You’ll need to set up a ladder so you can reach the roof. You may also want to have someone on another ladder at the other end of the roof to help you.
    • Write the numbers down so you don’t forget them.
  2. 2 Buy shed roofing felt. Go to the local hardware or home improvement store and locate roof felt. Use the roof area numbers that you wrote down when you measured to ensure that you buy enough felt to cover the entire roof.
    • If you have multiple options of roof felt, you’ll have to choose what is in your price range and seems like quality felt.
  3. 3 Remove existing felt or shingles. Climb up the ladder with a scraper of some kind. A scraper on a long pole is most effective. Position the scraper under the old felt or shingles and work it forward and backward so the roof covering comes loose. If the felt is nailed down or glued tight, this can be time consuming.
    • Be sure to dispose of the felt in the garbage once it is all removed.
  4. 4 Clean the surface of the roof and remove nails. Use a claw hammer or another nail removing tool to pull any nails that are crooked or sticking up from the roof. Any nails that are hammered flush with the roof decking can be left in place. Use a wet rag to wipe down the surface if it seems grimy.
    • Be sure to toss the nails into a bucket or trash barrel so they don’t end up in your yard. Loose nails can pop mower tires or end up in someone’s foot if you leave them on the ground.
  5. 5 Paint the roof with waterproof paint or primer. As mentioned above, weatherproof paint or primer adds an extra layer of sealant, even if you’re covering the roof with felt. Paint the roof at the same time that you paint the rest of the shed, or paint it separately when you are focused on felting the shed.
  6. 6 Lay the first piece of felt along the bottom edge of the roof. Unroll the felt horizontally along the length of the roof. Be sure to hang the felt about an inch over the edge of the roof so that water will run off.
    • The width of the rolls of felt you bought and the size of the roof will determine how many pieces of felt you need to lay.
  7. 7 Nail the felt down with galvanized clout nails. The exact type of nail you use can vary, but it’s important to use galvanized nails to insure that they don’t rust. Pound nails into the felt as you unroll it so that it stays in place. Nail around the entire perimeter of the felt, putting a nail roughly every 30cm (about every foot).
    • You’ll need to use nails that are at about 20mm (⅘ inch) long to ensure they go through the felt and secure into the roof.
  8. 8 Overlap the second piece over the first piece. When the first piece of felt is nailed in place, unroll the second piece horizontally as before. Make sure that it slightly overlaps the first piece to aid the flow of water. Nail the second piece in place as before.
    • Cover the whole side of the roof in this way. You may only need one or two pieces, depending on the size of the roof and the size of the felt roll. If you only need to use one piece, move to the other side of the roof.
  9. 9 Nail felt to the second side of the roof. Cover the second part of the roof in the same way you covered the first side. Start at the bottom and hang a bit of felt over the edge. Nail the felt in place as you go along. Be sure to overlap each piece on top of the one before it.
  10. 10 Center a final piece of felt over the apex so it overlaps both sides of the roof. When both sides of the roof are felted, lay one final piece on the top point of the roof. You don’t have to use a piece that is the full width of the roll. Cut it down to one foot or so, making sure it covers the crack of the apex and overlaps each side of the roof.
    • Since the felt on the sides of the roof form a crack at the top, it’s important to cover this with a final solid piece.
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Question How do I stop water from coming into my shed? Melissa and Michael Gabso are the Owners of MC Construction & Decks based in Los Angeles, California. With over ten years of experience, they specialize in exterior and interior remodeling and redesign, including kitchen, bathroom, and deck construction. Remodel & Redesign Experts Expert Answer

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If you have a large shed, consider hiring a professional contractor or handyman to properly waterproof the roof.


  • Waterproof paint and paint supplies
  • Caulk and caulk gun
  • Foam weatherstripping
  • Insulation (or bubble wrap)
  • Tape measure
  • Roof felt
  • Ladder
  • Scraper
  • Hammer
  • Hot water
  • Bucket
  • Rag
  • Galvanized nails

Thanks to all authors for creating a page that has been read 55,050 times.

How do you waterproof a leaky shed?

2. Lay the right base – How To Waterproof A Shed Roof All garden buildings need a base. And one of the reasons for this is the way in which your shed will become damp more easily if it sits directly on the ground. You can build your own base by following our guide on how to build a shed base, or you can buy a plastic shed base – an eco-friendly alternative to a concrete shed base,

Both concrete bases and plastic bases help waterproof your shed. As a watertight foundation, a concrete base helps keep your shed clear of groundwater seepage. But to improve waterproofing even further, you could use a waterproof membrane for your shed base. The best plastic base kits also boast waterproofing features.

For example, the EcoBase Fastfit Base Kit uses a honeycomb structure to stop rainwater from puddling under the shed.

What do you cover shed roof with?

Which material can I use for my shed roof? – Sturdy and waterproof materials are the best for use on a shed roof or garden building. Here at Roofing Superstore, we’d recommend using felt, bitumen roof sheets, bitumen shingles, plastic lightweight roof tiles, or wood shingles to secure an attractive, long-term waterproof roof.

Is peel and stick roofing waterproof?

Peel & Seal roll roofing will not tear, crack or dry out over time. It is designed specifically to reflect heat and resist water and exposure to other elements without any additional coverage needed.

Do roof sealants work?

Purpose – Roof sealants serve two main purposes: to protect your roof and to repair your roof. Depending on the product, roof sealants can provide a protective seal against moisture and sun exposure and can repair minor leaks before the leak creates serious damage.

Although some roof sealants will be effective on virtually any type of roof, most sealants are formulated to work with specific roofing materials. Roofing materials like asphalt shingles, composite shingles, metal, and rubber have different characteristics that require special considerations. Additionally, whether a roof is flat or slanted also can change what is considered an ideal roof sealant.

Finally, whether you’re attempting to repair minor damage or seal an entire roof will impact the type of roof sealant that’s best.

What is the strongest waterproof sealant?

Frequently asked questions about waterproof sealant – What is the best external waterproof sealant? Adiseal is the best external waterproof sealant. It seals instantly even underwater. It has high mould resistance. The clear waterproof sealant stays clearest when it was submerged in water for a long time.

  1. It is a sealant that also works in the rain.
  2. Can you paint over waterproof sealant? It is possible to paint over waterproof sealant if the sealant is Adiseal.
  3. Most paints are suitable to use.
  4. If the paint is oil or solvent based, it is recommended to test first.
  5. What sealant works in the rain? Adiseal weatherproof sealant works in the rain as well as in the dry and even underwater.

It seals instantly, like leaking gutters even if there is rain outside. It provides a long lasting and flexible seal. What sealants are waterproof? Adiseal is a waterproof sealant that seals in the dry, damp, wet and even underwater. Most sealant require a dry surface for it to be able to work properly.

What is the best outdoor waterproof silicone?

The Best Silicone Sealant 2022—Summary – Among these top products, we recommend the Gorilla clear silicone sealant caulk ( US$9.99, Amazon ) for any repair projects and touch-up jobs around the house. For higher performance and professional results, both the GE GE5070 advanced silicone kitchen and bath sealant ( US$8.74, Amazon ) and the DAP all-purpose adhesive silicone sealant ( US$9.78, Amazon ) are great options, particularly for installations of new bathtubs, sinks, and trims.

What is the cheapest way to cover a shed roof?

Cheap, cheerful & an easy DIY project – Felt is the classic inexpensive roofing material for sheds, It’s perfect for smaller budgets and the average DIYer. It’s so easy to re-felt your shed roof: simply lay the felt on your shed roof and nail it down.

What is the cheapest shed roofing material?

Roofing With MSR Roll Materials – In most cases, MSR roll roofing is the cheapest shed roof material you can buy. Roll roofing is also the easiest shed roof to install because you can cover large areas quickly by simply rolling it out and nailing it down.

Does a shed roof need to breathe?

At a glance: – You’ll get so much more use from your wooden shed if it’s a comfortable place to be. Make sure there’s adequate airflow to ensure better temperature control and a drier atmosphere, which helps prevent tools and electrical equipment from degrading.

What is a natural Waterproofer?

Waterproof your Fabrics Without Plastic – Can Non-Plastic Natural Materials Be Made Waterproof We all know how good of a job plastic does at keeping water out but can non-plastic natural materials be made water-resistant too? Absolutely! When making more plastic-free choices we are often opting for more natural materials, some of which are not typically known for being as reliably waterproof as plastic.

  1. There are however naturally water-resistant materials like beeswax and lanolin that can be used to protect all kinds of fabrics like cotton jackets, leather shoes, canvas bags, tents and more! Otter Wax is one our most trusted suppliers.
  2. They make all kinds of natural fabric care products while considering their ethical commitment to people, animals, and the planet.

They are an inspirational company who believes wholeheartedly that “Mother nature has given us all the tools we need to create products for everyday life”. Their products are made with natural plant-based ingredients that are sustainably harvested with the lowest environmental impact possible.

Is there a spray to make something waterproof?

You can use Bickmore waterproofing spray on various objects and materials, including leather, suede, boots, shoes, luggage, and more. It also protects against dirt and stains for an all-in-one spray treatment.

How long does liquid rubber last on roof?

Frequently asked questions – Is liquid rubber a good roof coating? Yes, liquid rubber is a high-quality roof coating material. It provides waterproofing, is easy to apply, is cost-efficient and is environmentally friendly. It allows building owners an alternative to costly roof replacement that’s just as effective in protecting the building from rain, wind and sun exposure.

  • How long does liquid rubber last on a roof? The best liquid rubber roof coating lasts 15 to 25 years, depending on the thickness and quality of the application.
  • The material needs to be applied in thin layers, but the more layers are applied, the longer the roof will last.
  • Once those 15 to 25 years have passed, though, you can recoat the roof to extend its lifespan even further.

Recoating involves power-washing, making any necessary repairs and applying a new thin layer of coating on top of the existing layer. Doing so allows the roof to last for another 15 to 25 years. shift-admin 2022-07-12T12:45:23-05:00

How long does peel and stick roofing last?

Durability – Roofing systems made with SA membranes are extremely durable and can stand up to a variety of weather conditions. Even with basic maintenance, SA membranes can last at least 20 to 30 years, and they are easy to repair should any problems occur. Their lifespan can be extended further through the use of products such as silicone coatings.

Is liquid rubber a good roof coating?

Liquid rubber for RV roofs – How To Waterproof A Shed Roof RV roofing can be very fragile and replacing it can be very expensive, so any RV and trailer owners would be wise to check for damage early and often and to get a can of liquid rubber for RV roofs. Easy to apply, environmentally friendly and perfect for all types of RV roofs, campers and trailers, liquid rubber sealant is an elastomeric coating which creates a waterproof seal, protects the surface and prevents leaks.

  1. To make your life even easier you can get a ready-made kit which includes everything you need – a 5 gallon can of RV roof coating, seam tape, primer, cleaner, brushes, rollers and even gloves.
  2. Eep in mind that you should not leave the can open while you work, because the top layer will start to dry out.

You can also keep any leftover sealant in the closed can and use it later, there is no need to use up the entire 5 gallons if you don’t need them.

What is the best sealer for outdoor wood?

Recap – We know that was a lot of information! Hopefully you learned something from this post to help you treat your wood for the outdoors! Remember that you have three methods to treat your wood:

  1. Use an outdoor-rated finish like polyurethane, epoxy, lacquer, or varnish.
  2. Make a natural oil finish with one part tung or linseed oil, one part mineral spirits, and one part polyurethane.
  3. Use a stain sealant combo that gives your wood some color and a durable finish all in one.

Check out more of our outdoor content at the links below!

What is a good outdoor sealant?

Exterior Butyl Rubber Exterior Caulk – Butyl rubber caulk is a popular pick due to its flexibility. Because of this, they are great at sealing exterior joints that experience vast movement. Butyl rubber is also very effective at sealing water in or out.

Butyl rubber can be applied to masonry, metal, and gutters. It is one of the most resilient waterproofing caulks optimal for chimney flashing and roofing applications. Butyl rubber is known to shrink more than other sealants; therefore, two applications are recommended. You shouldn’t apply it to voids larger than 0.25 in,

Similar to rubber, this caulking is exceptionally flexible. However, it is prone to become brittle and lose its elasticity resulting in oxidation and hairline cracks. In areas of extreme weather exposure, expect this caulk to last between 8 to 12 years.

What is the best treatment for a wooden shed?

Old sheds affected by mould, algae and other biological growth should be treated with a wood cleaner, prior to applying a wood preservative, paint or exterior wood oil. New sheds can be treated with a clear or coloured wood preservative to protect against mould, algae, insect attack and wood rot.