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Concrete Crawl Space

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Jun 15, 2015· A crawl space with a concrete floor has far fewer odor problems than an open crawl space. The ConsSome 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.

PERMINATOR EVOH Installation Guidelines W. R. Meadows

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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 …

SlabonGrade Vapor Barrier JLCOnline Forums

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Feb 10, 2006· Can anyone tell me definatively where the vapor barrier should go on a slabongrade 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.

Vapor barrier under garage slab | Page 2 | NonStructural ...

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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.

CIP 29 Vapor Retarders Under Slabs on Grade

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CIP 29 Vapor Retarders Under Slabs on Grade WHAT are Vapor Retarders? Vapor retarders are materials that will minimize the transmission of water vapor from the subslab support system into a concrete slab. Vapor retarders are typically specified according to ASTM E 1745 and have a permeance of less than US perms ( metric perms),

Optimal placement of vapor barrier under slab ...

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We're building a passivesolar 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?

Vapor barrier under exterior slabongrade?? Concrete ...

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Apr 08, 2002· For slabs without covering, a vapor barrier directly below the slab increases the potential for curling and diminishes the slablife. In addition, if your project is a tiltup concrete system, the slab will usually be placed first, before the roof structure, exposing the slab to exterior rain.

compacting gravel under a slab JLCOnline Forums

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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.

Slab over slab JLCOnline Forums

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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 subgrade and the slab. The …

Stego Industries | Moisture Protection Solutions

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Stego Industries is the leader in the belowslab concrete vapor barrier market. Known for our flagship Stego Wrap line of belowslab vapor barriers and retarders, Stego has earned the respect, trust, and recommendation of architectural, engineering, and construction communities.

Water Vapor Transmission How to Seal a Slab Before ...

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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 underslab vapor barriers will nearly ...

Vapor Barriers Under Concrete Floor Slabs: Friend or Foe?

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Vapor barriers have been associated with certain concrete slabongrade problems including curling and cracking. But they have also proven to be beneficial in reducing failures of moisturesensitive flooring materials, adhesives, and coatings caused by excessive emission of moisture vapor from concrete slabs.

Installing Rigid Foam Above a Concrete Slab ...

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Jan 11, 2019· If your basement slab lacks subslab foam, you'll have to install the insulation above the slab. There are several ways to install subflooring above the rigid foam: 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 foam.

Concrete Vapor Barriers What are They? The Concrete ...

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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 E1745, "Standard Specification for Water Vapor Retarders Used in Contact with Soil or Granular Fill under Concrete Slabs."

Installing a Vapor Barrier Underneath Concrete Slab ...

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Any home that is built on a concrete slab is going to need to have a vapor barrier 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.

Concrete Vapor Barriers The Concrete Network

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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 ...

Poly vapor barrier under XPS foam board in slab radiant ...

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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 foam 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 ...

16MIL REINFORCED “CLASS A” VAPOR BARRIER

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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 ...

Concrete Vapor Barrier Everything About Concrete

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A concrete vapor barrier is simply a sheet of polyethylene plastic (Visqueen) placed directly on top of the subgrade before the concrete floor or slab is poured to help keep moisture from the soil from passing up through the concrete.

Concrete Vapor Barrier What Is A Vapor Barrier And Do I ...

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A concrete vapor barrier is simply a sheet of polyethylene plastic (Visqueen) placed directly on top of the subgrade before the concrete floor or slab is poured to help keep moisture from the soil from passing up through the concrete.

Moisture Barrier and Underlayments: Don't Leave It Out ...

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Aug 27, 2010· I am rebuilding my basement floor after a flood with a subfloor 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.

MP Global 21/2 ft. x 40 ft. 6 mil Polyethylene Film ...

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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 selfsealing 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 longlasting moisture ...

Concrete Floor Problems | Building Science Corporation

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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.

Vapor Barriers, Radon, Basement Slabs, and VOCs — How to ...

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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.

Basement Floors by Striking Concrete Services, Inc.

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Striking Concrete has basement floor solutions that will have you enjoying your space through the ages. The most common problems that can occur with concrete slabs and basement floors are centered around moisture diffusion. The solution, is to form a proper barrier between the ground and concrete.

Concrete Vapor Barriers: The Pros Cons of Getting The Vapors

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May 03, 2011· 2part question: 1) I'm building a 2car 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.

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