It would seem the stone would allow greater drying via the vapor phase particularly is there was a radon mitigation system. You can also cover concrete with sheets of plastic, but beware; this may cause discoloration of the surface if the plastic is not uniformly spread over the concrete. ... For sidewalks placed directly on the subgrade soil, is a sheet-plastic vapor retarder useful or harmful? http://publicecodes.cyberregs.com/st/ca/st/b400v10/st_ca_st_b400v10_appf_sec001.htm. ... Methods of curing include covering the concrete with plastic ⦠However, we choose to put the poly below it regardless, because we don't like our insulation's r-value being degraded at all. So, to answer the question, yes, using the blotter sand technique was dangerous and illogic but putting the poly up or down is a matter of job site condition, that's it. Come join the discussion about tools, projects, builds, styles, scales, reviews, accessories, classifieds, and more! Alain, And because foam goes down fast, we just wait for a window when the weather is good for a few days so we can get the foam down and get the slab poured immediately after. In the recent construction of our pre-certified PassivHaus in NJ we did exactly what Peter (above) described. Itâs the perfect ⦠Salt Response to Alain Hamel (Comment #14) Choose a method that works for you. One contractor says to put plastic under the concrete, it prevents moisture from coming up into the concrete. When the ground under the concrete settles, cracks could form if the settling is uneven. Additionally, I used poured stem walls and a 'floating' slab (thermal and structural isolation) and NO rebar in the slab. If this approach is legally required in Canada, you should, of course, follow the code. For 3 1/2" slab a 6x6-W4.0xW4.0 will do. i saw this detail in one of Joe L's post on another site. But the closer it is to the top the more effective it is at crack control. Besides that, for years many, many homes were built without poly. Karl. Gravel pavers are available in a variety of different shapes and sizes and are composed from either plastic or a heavy duty geotextile. Great stuff. For the concrete pouring thing, i use chairs on stairs, balconies or structural slabs never on basement slab, its useless, rebars or reinforcement mesh are only there as an attachment for the pipes, i ask concrete finishing team to slightly shake the pipes support to be sure that they are well coated with concrete. Perfect timing Southern Arizona slab on grade with radiant tubing Response to Matthew Nolette (Comment #2) It could protect the concrete from freeze-thaw damage by reducing the amount of water it absorbs from the wet subgrade. Sub-slab foam serves no other point than to insulate, so why risk defeating that purpose at all? But it might be harmful to seal this concrete ⦠These are valid points. Our Driveway Fabric is a permeable textile that increases stability, provides erosion control, and aids in the stabilization of the substrate under your driveway or temporary entrance. Once this happens the foam becomes buoyant and pokes up thru the concrete like icebergs. I'll never recommend anyone use a crawlspace in Arizona. Longevity The ground is always damp. I agree, but I think a much simpler, more forgiving approach is to break the slab up with control joints. This doesn't strike me as one of those building science issues with warning signs written all over it. That is what would be living in your crawlspace and coming into and around your home if you did a crawlspace. Good subject but.. Q. Is this really only applicable where you wouldn't be putting another finish over the slab or is this really not a recommended practice at all? Anything less is a very bad idea. "Has anyone else come across the discussion of polyethylene degradation below slabs?". I fully agree with Martin's blog and not some recent posts 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 â¦
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