11 Feb
2019
11 Feb
'19
11:42 a.m.
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