This issue of poly, or not, is interesting. On a new large floor where I now store my cars I purposely went no poly, after a lot of thought, as to where do you think that water goes? It is trying to get up despite your poly?.Must build up rather aggressively under there with various sequels --none of them good. I have not had any dampness troubles, but garage is heated to 50-55 in winter and very heavily insulated/sealed . In winter humidity is low, the moisture comes up and dissipates . Insulation is key I think, because I have noted that opening the garage door on humid hot summer day the floor flashes damp , due to cooling..but that evaporates when door is closed. poly will not stop that coolness , below outside temp, -- w insulation. Equilibrium happens if kept sealed. .
The space was framed as a large pole barn, using creosoted real telephone poles, no floor (originally horses) ; I redid 100% , in the process found that pole bottoms were ,like, GONE…ready to fall over after 40 years. Gives an insight as to what is going on if you do not let moisture out , would be even worse . Now shortened poles sit attached to concrete by steel. Lot of unanticipated work.
I saw a plan --and almost did it --involving putting poly with perforated 4” drain type PVC on 4’ centers just under slab over the poly , vented to outside risers , but decided I was getting 90% fanatic over 10 % problem. Dehumidifier that senses humidity, heavy sealing and insulation is probably best way.. however I am happy no poly. Experts are often FOS, in building codes IMHO. I was victimized by “vapor shields” they “required” in 70’s (poly in walls) that turn to solid mold. It is just someone’s loudmouth opinion, usually has a $ motive, and they may not be the brightest bulb in the sign. Getting old makes you feel like that..
The ability to hold water is related to temp, so insulation keeps it about 55 year round in NE, less water in summer in air in there , that saturated air outside at 70-80, none in winter , and inside construction absorbs a lot too , acts a little bit like dehumidifier (it is wood/plaster) heat drys it out like crazy in winter. . Another one in concrete block,…seems to be more damp . The idea that chrome etc deteriorates in storage relates to all this…good discussion. Answers not really clear.
now that we a getting into the summer months, any suggestion on how to eliminate moisture buildup on concrete floors due to higher humidity. thanks in advance, jim
Posted by: "John Grady" <jkg@xxxxxxxxxxxxxxxxx>
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