<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr"> Concrete may, if thick enough, be _water_proof (think dams) but when used as a floor it is not _vapour_proof. Vapour comes right through six inches of concrete, almost as readily as through bare earth. </div><div dir="ltr"> A responsible installer of tile, vinyl, carpet or anything else will tape a pane of glass down onto a concrete floor that is poured on ground, then check for condensation on underside of the glass a day later. One should not place a bet that there will be no condensation; there almost always is. That’s why carpets on lower-level of houses will smell musty after a year or so; it is because they are musty. </div><div dir="ltr"> Any conscientious home builder will put a layer of 10-mil plastic sheeting on top of the crushed rock before he pours the concrete. I read about one once; have never met one. </div><div dir="ltr"> There are ways to seal the concrete, ways of greater or lesser effectiveness. One commonly-used product in USA is “DryLock”, a coating for concrete that is pretty effective at stopping moisture vapour seeping through the concrete. It is simple to apply, but hard work, as the thick material must be scrubbed into the concrete floor and walls to achieve the sealing effect wanted. It works; I used it on the lower level of my raised-ranch house and found the dehumidifier ran half as much. </div><div dir="ltr"> In a garage, I would work at improving ventilation before messing around with concrete sealer. Code for a house is one sq foot of ventilation per 1000 square ft of house. That is entirely inadequate, especially so when one realises that ordinary window screen reduces air flow by 50%. A 12x20 ft garage is 240 sq feet, and really should have a vent at each end, or ridge vent its entire length. That is way in excess of code requirements, but will reduce considerably condensation from moisture through the floor.</div><div dir="ltr">Bob</div><div dir="ltr"><br></div><div dir="ltr"><br>On May 6, 2021, at 5:20 PM, Max Heim <<a href="mailto:mvheim@sonic.net">mvheim@sonic.net</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="Content-Type" content="text/html; charset=utf-8">Theoretically it will form on the underside of the plastic… which will not be good for your carpet, which should be removed.<div class=""><br class=""></div><div class="">Leave the cover off for ventilation, as much as possible (obviously you might want to cover the car if you are running the saw or the belt sander, or spraying paint). If you could leave the windows down, at least a few inches, it would help. Surely mice can’t climb up sheer glass…</div><div class=""><br class=""></div><div class=""><br class=""><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="margin: 0px; font-size: 13px;" class="">--</div><div style="margin: 0px; font-size: 13px; min-height: 16px;" class="">Max Heim</div><div style="margin: 0px; font-size: 13px;" class="">'66 MGB</div></div></div>
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<div><br class=""><blockquote type="cite" class=""><div class="">On May 6, 2021, at 2:06 PM, Frank Krajewski <<a href="mailto:frankk12@verizon.net" class="">frankk12@verizon.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">I have received many great suggestions from the list. A simple start will be to create a moisture barrier between the concrete floor, which at present has a carpet, and the MGB. This will be in the form of a tarp or plastic sheet. Excuse my naïveté but what prevents moisture from forming on the tarp or plastic? <br class="">Frank Krajewski<br class="">1980 MGB LE<br class="">1991 Mazda Miata SE<br class="">2003 RAV4<br class="">2021 Subaru Outback Limited <br class=""><br class="">Sent from my iPad<br class="">_______________________________________________<br class=""><br class=""><a href="mailto:Mgs@autox.team.net" class="">Mgs@autox.team.net</a><br class="">Donate: <a href="http://www.team.net/donate.html">http://www.team.net/donate.html</a><br class="">Suggested annual donation $12.75<br class=""><br class="">Archive: <a href="http://www.team.net/pipermail/mgs">http://www.team.net/pipermail/mgs</a> <a href="http://autox.team.net/archive">http://autox.team.net/archive</a><br class=""><br class="">Unsubscribe: <a href="http://autox.team.net/mailman/options/mgs/mvheim@sonic.net">http://autox.team.net/mailman/options/mgs/mvheim@sonic.net</a><br class=""><br class=""></div></div></blockquote></div><br class=""></div></div></blockquote><blockquote type="cite"><div dir="ltr"><span>_______________________________________________</span><br><span></span><br><span><a href="mailto:Mgs@autox.team.net">Mgs@autox.team.net</a></span><br><span>Donate: <a href="http://www.team.net/donate.html">http://www.team.net/donate.html</a></span><br><span>Suggested annual donation $12.75</span><br><span></span><br><span>Archive: <a href="http://www.team.net/pipermail/mgs">http://www.team.net/pipermail/mgs</a> <a href="http://autox.team.net/archive">http://autox.team.net/archive</a></span><br><span></span><br><span>Unsubscribe: <a href="http://autox.team.net/mailman/options/mgs/mgbobh@gmail.com">http://autox.team.net/mailman/options/mgs/mgbobh@gmail.com</a></span><br></div></blockquote></body></html>