Union agreements often require that the contractor provide a dry shack on-site. Dry Shacks A layout plan identifying the placement of all temporary facilities needed during the construction stage of the project, such as the office trailer, storage, security fencing, dumpsters, and portable toilets.
DRY SHACK. A construction shack shall be provided in the event that the job is longer than thirty (30) consecutive days, and that there are no other facilities available, and that there is sufficient room or location available, and that there are three (3) or more workers working on the job.
Where can I find more information about dry-stack masonry?
CONSTRUCTION – Dry-stack concrete masonry units can be used to construct walls that are grouted or partially grouted; unreinforced, reinforced or prestressed; or surface bonded. With each construction type, walls are built by first stacking concrete masonry units.
For unreinforced construction as shown in Figure 2a, grouting provides flexural and shear strength to a wall system. Flexural tensile stresses due to out-of-plane bending are resisted by the grout cores. Grout cores also interlace units placed in running bond and thus provide resistance to in-plane shear forces beyond that provided by friction developed along horizontal joints.
Grout cores can also be reinforced to increase flexural strength. Reinforcement can be placed vertically, in which case only those cells containing reinforcement may be grouted as shown in Figure 2b, as well as horizontally, in which case the masonry must be fully grouted.
Another version is to place vertical prestressing tendons in place of reinforcement. Vertical axial compressive stress, applied via the tendons, increases flexural and shear capacity. Tendons may be bonded to grout, or unbonded, based upon the design. Placement of grout may be optional. Horizontally reinforced bond beam lintels can be created using a grout stop beneath the unit to contain grout.
As an alternative to reinforcing or prestressing, wall surfaces may be parged (coated) with a fiber-reinforced surface bonding cement/stucco per ASTM C887(ref.14) as illustrated in Figure 2c. This surface treatment, applied to both faces of a wall, bonds concrete units together without the need for grout or internal reinforcement.
Is the shack area dry year round?
Our Temporary Ham Shack After becoming licensed in 2010/2011, AB1OC and AB1QB set up a “temporary” HF station in our second-floor home office. In retrospect, this was a good idea because it gave us a chance to use some of our HF equipment and learn what we really wanted to do with a more permanent station.
The second-floor location required a 20+ ft connection to the ground which created RF problems in the temporary shack The room did not have adequate electrical power or cooling to allow full operation of our station in a comfortable environment We did not have a good way to disconnect and ground our antennas during electrical storms We only had room for one operating position which became a problem as we both got more involved in HAM radio
I plan to cover the design and construction of our new ham shack in a series of four posts. This first post will cover the planning and framing aspects of the project. Late in 2011, we began to make plans for a more permanent station in the basement of our house. Our goals for our new ham shack design included:
Building a state-of-the-art multi-op station with separate positions that would allow both of us to operate at the same time Adequate power and cooling to allow the use of legal limit amplifiers in a comfortable environment Good lighting and ergonomics to support extended operating sessions including multi-day contests A well-executed antenna switching and station ground system to provide better lightning protection and RF grounds for our station Provision for full automation of our station’s antenna switching and human interfaces to support more automated sharing of our antenna farm in a multi-SO2R configuration Addition of weak-signal VHF/UHF systems to our station A permanent area for electronics construction and troubleshooting (we are both Electrical Engineers and are interested in the “home brewing” side of Amateur Radio) An A/V area to allow us to take advantage of our existing Whole House Entertainment System Adequate storage for all of our Amateur Radio items
The first step in the project was to secure a building permit to finish a room in our basement and clean out and seal the area prior to construction. Our basement is dry year-round so we could finish the shack area without water problems. As an extra precaution, we also installed underground drain lines on all of our rain spoutings that surround the shack area in our basement to ensure that we would not have water problems in the future. Rain Drainage With our building permit in hand, we translated our ham shack design to draw up detailed plans for the room’s framing, electrical system, and HVAC system, as well as plans for the finish elements such as the operating desk and cabinetry. Plans For Our New Shack In addition, we did careful heat dissipation calculations to determine the HVAC requirements for the room as well as electrical power planning to determine the total electrical capacity, circuit count, and individual circuit load requirements.
- We have been fortunate to work with several very good carpentry, electrical, and HVAC contractors on other remodeling projects that we have done around our home and these folks were very helpful in developing our plans for our new shack.
- Our contractors also handled some of the work to complete the project.
We worked with Jim and Bob Bourassa ( [email protected] ) on many of the carpentry aspects of our project. Brian Fessenden ( [email protected] ), our electrician, helped us to plan and install the electrical and generator systems. Absolute Mechanical Systems, our HVAC contractor helped us with the HVAC systems in our Shack, and Brian Veillette ( [email protected] ) handled the excavation and landscaping elements outside the shack. Lumber For Framing One of the most useful tools at the framing stage of a project like this is a good set of laser levels. These tools help to get all of the walls and other aspects of the framing square, plumb, and level. Some time spent to get everything right at this stage makes the drywall, flooring, ceiling, and finish carpentry aspects go much more smoothly and ensures a good overall result. Laser Levels The framing of our shack was a bit of a challenge due to several non-conventional aspects of our room and the plans for it. The following picture shows the nearly completed framing looking into the room. The back wall was thicker than standard to allow for the installation of 2″ PVC conduits to route coax and control cables inside this wall to the planned operating positions. Shack Framing (View Into The Room) The picture below is a view of the framing from inside the shack. The stairs and the wall next to it also presented some challenges. The original width of the stairs did not allow the new wall to line up properly with the finished wall in the stairwell above the shack.
To solve this problem, I had to remove the stair riser and narrow the stairs by about 1/2″. There also was a column in the location of this wall to support the beam and floor above the shack so we had to temporarily support the wall with jack columns and build a load-bearing wall under this area. Finally, the overhead support beam and a series of HVAC ducts, and other lines between the beam and the front wall had the potential to create a low ceiling.
Some careful attention to the framing in this area created a ceiling that was no lower than the bottom of the existing beam which allowed plenty of ceiling-to-floor clearance. These are all pretty standard framing construction problems and a good basement remodeling book will explain how to do these steps if they are needed. Shack Framing (View From Inside The Room) We also opted to build an area outside the shack to mount a dedicated electrical breaker panel for the room as well as to provide a place to mount our planned antenna switching matrix. This was done by building a simple 2×4 frame on the wall and covering it with a piece of plywood. Node 1 We installed a pair of bookshelves in this area to hold all of our Amateur Radio-related books and manuals. Our local Staples store supplied the shelves. The next step of our shack construction project will be the electrical and HVAC rough-in. This will be the subject of our next post.
A Tour of Our Shack Shack Construction – Part 2/4 (Electrical, HVAC, And Grounding) Shack Construction – Part 3/4 (Insulation, Drywall And Finish Construction) Shack Construction – Part 4/4 (Final Setup Of Equipment) Complete presentation on the Design and Construction of our station including Towers and Antennas
– Fred, AB1OC If you have found a spelling error, please, notify us by selecting that text and pressing Ctrl+Enter,
What are the provisions of the Tek for dry stack construction?
INTRODUCTION – Construction of masonry wall systems is possible without the use of mortar. The use of standard CMU units laid dry and subsequently surface bonded with fiber reinforced surfaced bonding cement has been well documented in the past. (ref.16) With the use of specially fabricated concrete masonry units known as “dry-stack units,” construction of these mortarless systems is simple, easy and cost effective.
- Grouted, partially grouted or surface bonded
- Unreinforced, reinforced, or prestressed
Note that dry-stacked prestressed systems are available that do not contain grout or surface bonding. The provisions of this TEK do not apply to such systems due to a difference in design section properties (ref 8). Specially designed units for dry-stack construction are available in many different conÞ gurations as shown in Figure 1.
The latest and most sophisticated designs incorporate face shell alignment features that make units easier and faster to stack plumb and level. Other units are fabricated with a combination of keys, tabs or slots along both horizontal and vertical faces as shown in Figure 1 so that they may interlock easily when placed.
Physical tolerances of dry-stack concrete units are limited to ± 1 / 16 in. (1.58 mm.) which precludes the need for mortaring, grinding of face shell surfaces or shimming to even out courses during construction. Interlocking units placed in running bond resist flexural and shear stresses resulting from out-of-plane loads as a result of the keying action: (a) at the top of a web with the recess in the web of the unit above, (b) at two levels of bearing surface along each face shell at the bed joint, and (c) between adjacent blocks along the head joint.
The first of these two interlocking mechanisms also ensures vertical alignment of blocks. The interlocking features of dry-stack units improve alignment and leveling, reduce the need for skilled labor and reduce construction time. Floor and roof systems can be supported by mortarless walls with a bond beam at the top of the wall which expedites the construction process.
Wall strength and stability are greatly enhanced with grouting which provides the necessary integrity to resist forces applied parallel, and transverse to, the wall plane. Vertical alignment of webs ensures a continuous grout column even when the adjacent cell is left ungrouted.
- Grouting is necessary to develop flexural tensile stress normal to the bed joints, which is resisted through unit-mortar bond for traditional masonry construction.
- Strength of grouted dry-stack walls may also be enhanced by traditional reinforcement, prestressing, post-tensioning or with external fiber-reinforced surface coatings (surface bonding) as described in the next section.
Typical applications for mortarless concrete masonry include basement walls, foundation walls, retaining walls, exterior above-grade walls, internal bearing walls and partitions. Dry-stack masonry construction can prove to be a cost-effective solution for residential and low-rise commercial applications because of it’s speed and ease of construction, strength and stability even in zones of moderate and high seismicity.
How to apply Dry shake on concrete?
Dry Shake Application Methods – Dry shake is applied onto fresh concrete by hand or machinery. Commonly, hand application is finalized after the initial set and floating of the concrete whereas machine application is conducted immediately after concrete placement, before the concrete sets. Fig.2: Dry Shake Application by Machine Fig.3: Finishing Process of Dry Shake Hardener