On 2/11/19 10:48 AM, Tapley, Mark via cctalk wrote: > Jack, this looks like a pretty good idea in the short term. But, every piece > of concrete I have ever been associated with has been off-gassing water at a > slow rate. I have stored wood face-down on concrete enough times that I > should know better, and it has always been ruined - rotted - by constant > exposure to that water off-gassing. The wood traps the water (which would > normally have no problem evaporating, because it is a very slow rate) which > then rots the wood. Now whenever I store wood flat, I put bricks or something > between it and the concrete so there is an air-gap. > > Unless there is a pretty impermeable water barrier between the plywood and > the concrete, I would say that solution is not trustable for more than about > 6 months of service at the outside. Even if there is, I would check pretty > often around the bolt holes, because I think the bolts penetrated the barrier > and the wood around the bolts will be rotten soon. > > Comments and corrections most welcome from anyone who has more experience, of > course; YMMV and I Am Not a Carpenter…
Yup, the first thing done to the concrete floor of my shop was to apply a sealer, then a layer of mastic and vinyl tile. (tile, not sheet goods, as it's simple to replace a damaged tile). It's held up well for almost 30 years, with no trace of moisture damage here in the soggy Pacific Northwest. The concrete walls were similarly isolated with a layer of 30 lb. roofing telt, with an insulated stud wall and sheetrock over it. --Chuck
