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Jan 11, 2019· If your basement slab lacks sub-slab , you'll have to install the insulation above the slab. There are several ways to install subflooring above the rigid : you can use either one or two layers of plywood or OSB, and the subflooring can either be fastened to the concrete with long Tapcon screws or it can simply float above the .
Any home that is built on a concrete slab is going to need to have a vapor barrier installed.The vapor barrier covers the ground underneath the concrete slab in order to protect the home from any type of moisture from seeping through the porous concrete and into the home.
Stego Industries is the leader in the below-slab concrete vapor barrier market. Known for our flagship Stego Wrap line of below-slab vapor barriers and retarders, Stego has earned the respect, trust, and recommendation of architectural, engineering, and construction communities.
A concrete vapor barrier is simply a sheet of polyethylene plastic (Visqueen) placed directly on top of the sub-grade before the concrete floor or slab is poured to help keep moisture from the soil from passing up through the concrete.
Thin plastic like this is often called a vapor retarder—meaning it slows the vapor down but doesn't stop it. A much better approach is a true vapor barrier, with characteristics that conform to the requirements of ASTM E-1745, "Standard Specification for Water Vapor Retarders Used in Contact with Soil or Granular Fill under Concrete Slabs."
Dec 07, 2004· Re: compacting gravel under a slab Tucker: With 2 to 3 feet of rock, I fail to see why you need either poly or insulation under the slab, I think I would opt for the "oozing" and the thickening effect of the "waffle" bottom, I would think that structurally it turns a 3 1/2" slab into something more like a 6 or 8" slab from a structural standpoint.
Dec 11, 2007· As we saw on a recent post, not all garages have properly sloped floors. Even if they are properly sloped, water doesn''t flow very well on the rough concrete floor. I prefer not having vapor barriers under garage floors so the water or melting ice that drips off the cars can soak through the slab and gravel into the dirt.
May 26, 2008· Actually, no. Air barriers need to be continuous and free from holes, but vapor barriers do not need to be. Lots of vapor moves by air movement, not a heck of a lot of vapor moves by vapor diffusion. The concrete slab is the air barrier, and the ripped and torn and punctured polyethylene sheet is the vapor barrier. It's that Fick's Law thing.
design between the vapor barrier and the slab, additional care should be taken, especially if sharp crushed rock is used. Washed rock will provide less chance of damage during placement. These are very general installation instructions. Instructions on architectural or structural drawings should be reviewed and followed as well. Detailed ...
A perpetual problem with thin overlays is that since they form an impermeable layer on the slab, any water vapor emissions from the underlying slab will be trapped. This vapor can then develop more pressure than the bond strength between the topping and the slab, delaminating the topping. Slabs that lack under-slab vapor barriers will nearly ...
Vapor Barriers for Concrete Slabs Learn how to minimize moisture vapor moving through a slab by choosing the right vapor barrier and installing it properly By Bill Palmer, Concrete Network Columnist. The last thing you want your customers to envision when thinking of a concrete floor is a damp, cold basement slab. One of the reasons those old ...
Feb 10, 2006· Can anyone tell me definatively where the vapor barrier should go on a slab-on-grade installation. Before asking this I went through old threads/articles to first read how important a layer of sand or gravel between the VB and the bottom of the slab is, only to follow up with an article completely condemning this practice.
Aug 27, 2010· I am rebuilding my basement floor after a flood with a sub-floor with 2×3's ( floor is too uneven to install laminate directly on concrete) and since no vapour barrier was put under the concrete, I want to know if putting a 6mil plastic vapour barrier directly on the concrete will do any harm.
At just 100 sq. ft. per roll, Moisture Barrier eliminates the hassle of dealing with a giant sheet of folded plastic. It rolls out and lies flat, with self-sealing seams making it simple to connect and form a continuous 6 mm vapor barrier between wood or laminate planks and a subfloor. Made with polyethylene for long-lasting moisture ...
Nov 01, 2010· Problems with vapor barriers Sub slab vapor barriers by themselves are not effective barrier to radon entry. There are too many other pathways around the vapor barrier for the radon gas to travel. I believe the vapor barrier's prime benefit is to block moisture wicking into the concrete.
CIP 29 - Vapor Retarders Under Slabs on Grade WHAT are Vapor Retarders? Vapor retarders are materials that will minimize the trans-mission of water vapor from the sub-slab support sys-tem into a concrete slab. Vapor retarders are typically specified according to ASTM E 1745 and have a per-meance of less than 0.3 US perms (0.2 metric perms),
May 03, 2011· 2-part question: 1) I'm building a 2-car garage with upstairs apartment in zone 4, 26' x 28'. getting different opinions on whether the vapor barrier -6ml plastic- should be under the 4'' of gravel or on top of the gravel directly under slab? Some are saying it is not good to pour concrete right on plastic, although this seems to be the most common way to do it.
If a cushion or blotter layer is required in the design between PERMINATOR EVOH and the slab, additional care should be given if sharp crushed rock is used. Washed rock will provide less chance of damage during placement. Care must be taken to protect blotter layer from precipitation before concrete .
Apr 08, 2002· For slabs without covering, a vapor barrier directly below the slab increases the potential for curling and diminishes the slab-life. In addition, if your project is a tilt-up concrete system, the slab will usually be placed first, before the roof structure, exposing the slab to exterior rain.
We're building a passive-solar home (SIPs on a monolithic slab for thermal mass). I'm wondering about the placement of the vapor barrier underneath the slab. Should the order be (from bottom up): gravel fill layer, vapor barrier, XPS, then concrete? Or can it go: vapor barrier, gravel fill, XPS, then concrete? Are there any moisture issues associated with the latter method?
Jun 15, 2015· A crawl space with a concrete floor has far fewer odor problems than an open crawl space. The Cons-Some are constructed with foundation vents; Most are poured as a "mud pad". A mud pad is a rough poured concrete slab that's sole purpose is to cap the earth under it- usually without a vapor barrier between the concrete and the earth.
May 26, 2016· I am building a 28x40 garage in New Hampshire. I am doing an I slab radiant pour. I plan to use 2 inch xps board under the slab and as a thermal break to to frost walls. The issue that I have is that this install is for a garage build and will not have a roof over the floor before the slab pour leading to the possibility of rain water ending up being caught between the vapor barrier and ...
Apr 05, 2004· Re: Slab over slab Hey guys, great responses from everyone! Mike, thanks for the reminder. I probably should have stated that this job is in San Diego, CA. It is common practice here to omit the vapor barrier between sub-grade and the slab. The .
A concrete vapor barrier is simply a sheet of polyethylene plastic (Visqueen) placed directly on top of the sub-grade before the concrete floor or slab is poured to help keep moisture from the soil from passing up through the concrete.
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