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Insulated slabs usually have vapor barrier underneath. Since you did a test and found no moisture, there should be no problem installing vinyl flooring on it.


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The US Dept of Energy also says 1/16" back drainage cavity for siding is appropriate even though capillary action occurs up to 1/4". Point being, the department of energy tends to lag significantly behind the latest in building technology. I did my undergraduate in environmental sciences at the University of Missouri and my masters in architecture at the ...


2

Follow manufacturer's instructions first and foremost. Also in places with hot humid climate vapor barrier on the inside wall causes more trouble than it fixes. https://www.jameshardiepros.com/getattachment/98adb0c7-1bd1-49e7-a9d4-a8275d29ae4a/HardieBacker-Installation-Guide-English_Spanish-HB1710.pdf Note on page 4 "vapor barrier if local codes require." ...


1

Whether one product is "better" than another is really subjective. What I can tell you is that denshield is a more advanced product, eliminates the need for a membrane, and I find it easier to use than cement board for sure However, I would get four sheets instead of three. Then you only need to have three vertical seams, total: two corners and one along a ...


1

I would not do the plastic vapor barrier as it will not do much to help. The area under the deck is open to the outside air and that air will dominate the moisture content of the air under the deck. In a crawlspace under a house, the air moisture can easily be dominated by the soil moisture and is one reason that a vapor barrier is used. The tar paper over ...


1

I think you can do air/moisture/heat in one shot by using spray foam behind foam panels. Buy two cans of max-expansion spray foam. One may do, but it's best to have enough on hand. Cut 1-1/2" or 2" foam panel to fit each bay reasonably well. The plan is basically this: Spray a layer of foam on the mortar / set the foam panel in place / let the foam cure ...


1

I've used a product called Xypex. There's a lot of these Integral Crystalline Systems on the market. The manufacturers say that the thin slurry penetrates wet concrete, especially new concrete, forming dendritic crystals that grow into and fill the microscopic pores and cracks. They claim that the crystal growth penetrates concrete several inches deep. ...


1

I have had great luck at sealing slabs with 2 part epoxy paint, in a garage you don’t want to go cheap or when you drive the car in and park it where the tires are ends up pealing up. I have painted in summer when the slab was dry enough and eliminated a huge amount of moisture in basements. This will help if the source is from the slab if high humidity is ...


1

Your first question is a bit unclear, but I'd consider installing blocking to bring the wall on plane, then OSB or plywood sheathing. You could have a selection of spacer blocks on hand and pull lines to check the needed thickness at each vertical on 24" centers. I'd probably pull horizontal lines top and bottom, then pull between them as you install the ...


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Once the vapor barrier or plastic is installed/stapled over the faced insulation while forgetting to destroy/slash insulation facing underneath, three likely possibilities exist for destroying/slashing the insulation facing beneath the plastic or vapor barrier. 1) Possible to pull-up the vapor barrier at the top and bottom, only destroying the vapor barrier ...


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That foil is probably a vapor barrier, if the foamboard isn't already Most foamboard is made from what is called closed cell foam; this provides it with adequate rigidity, but also makes it largely impermeable to moisture, atop being an effective air barrier when taped properly at the seams. Even if your foamboard itself wasn't a vapor barrier, the foil ...


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Super late to the discussion, but for those who are still using this as a reference, the important thing to note is that open cell spray foam insulation is not a vapor barrier. Use closed cell foam if you are intending to create a vapor barrier. Another solution that may be more cost effective would be to cut foil-faced EPS and place to underside of ...


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