Foam under basement slab
xaja34
12 years ago
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umsteadrunner
12 years agoRelated Discussions
Voids Under Basement Slabs
Comments (2)If the problem is running water, the settlement will continue. But if six inch voids in 50 years is representative, I would stabilize it with slurry, fix my downspouts and forget it. I've put in radiant heating and find it much overrated. *** I once came across a nice 80-year old home where the owners had decided to lower the basement floor for a rental apartment. Shortly after they jackhammered the concrete away and started digging they hit an underground stream. Before they could find sump pumps, the water rose five feet, leaving a "high-tide" mark on the walls. Now, two pumps operate 24-hours a day and will continue to do so until Lake Ontario runs dry....See MoreHelp with gravel under basement slab
Comments (1)you need to rent a compactor and go over the entire area to make sure all the gravel is compacted and nice and flat...See MoreInsulating under deep, heated basement slab: rockwool vs EPS, & depth?
Comments (7)How is rock wool going to meet the compressive strength requirements for a stable slab? And if you compress it that much - it's no longer insulates, right? I have 6" of EPS under my slab. It's high compression EDITED - it's XPS that is 40PSI (i think) which is higher than the soil compaction PSI requirement. Over that a taped 15Mil vapor barrier - Stegowrap Curious about the concern about EPS/XPS. We had a concern over the blowing chemicals (hexobromododecane? I think??? which is used in the manufacture / fire retardant process and is bioaccumulating etc - so we found a product that used CO2 in blowing process and imported from Finland......... FINNFOAM. Briefly looked at a product called FOAMGLAS too - but that was stupid expensive....See MoreMinimum Basement under slab insulation R Value to make it feel warm.
Comments (8)Insulation is what keeps the slab at 70, and not a ground coupled 55. So insulation helps a great deal. But the floor will still feel cold to bare skin without a less conductive surface on top of it. The reason a 70 degree concrete slab feels cold isn’t because of a lack of insulation. It has to do with thermal conductivity. It’s a large thermal mass that is cooler than your body, and it’s highly thermally conductive. It can quickly absorb the heat from your bare feet, away from your feet. Put wood over that concrete mass, and even a .5 R value, plus the lesser thermal conductivity, makes the floor feel “warm”....See Morelive_wire_oak
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