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Concrete may, if thick enough, be _water_proof (think dams) but when us=
ed as a floor it is not _vapour_proof. Vapour comes right through six inche=
s of concrete, almost as readily as through bare earth.=20
A responsible installer of tile, vinyl, carpet or anything else will tap=
e a pane of glass down onto a concrete floor that is poured on ground, then c=
heck for condensation on underside of the glass a day later. One should no=
t place a bet that there will be no condensation; there almost always is. T=
hat=E2=80=99s why carpets on lower-level of houses will smell musty after a y=
ear or so; it is because they are musty. =20
Any conscientious home builder will put a layer of 10-mil plastic sheetin=
g on top of the crushed rock before he pours the concrete. I read about one=
once; have never met one.=20
There are ways to seal the concrete, ways of greater or lesser effectiven=
ess. One commonly-used product in USA is =E2=80=9CDryLock=E2=80=9D, a coati=
ng 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 m=
aterial must be scrubbed into the concrete floor and walls to achieve the se=
aling effect wanted. It works; I used it on the lower level of my raised-ra=
nch house and found the dehumidifier ran half as much. =20
In a garage, I would work at improving ventilation before messing around w=
ith 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 re=
alises that ordinary window screen reduces air flow by 50%. A 12x20 ft gar=
age 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 re=
duce considerably condensation from moisture through the floor.
Bob
> On May 6, 2021, at 5:20 PM, Max Heim <mvheim@sonic.net> wrote:
>=20
> Theoretically it will form on the underside of the plastic=E2=80=A6 which w=
ill not be good for your carpet, which should be removed.
>=20
> Leave the cover off for ventilation, as much as possible (obviously you mi=
ght want to cover the car if you are running the saw or the belt sander, or s=
praying paint). If you could leave the windows down, at least a few inches, i=
t would help. Surely mice can=E2=80=99t climb up sheer glass=E2=80=A6
>=20
>=20
> --
> Max Heim
> '66 MGB
>=20
>> On May 6, 2021, at 2:06 PM, Frank Krajewski <frankk12@verizon.net> wrote:=
>>=20
>> 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 presen=
t has a carpet, and the MGB. This will be in the form of a tarp or plastic s=
heet. Excuse my na=C3=AFvet=C3=A9 but what prevents moisture from forming o=
n the tarp or plastic?=20
>> Frank Krajewski
>> 1980 MGB LE
>> 1991 Mazda Miata SE
>> 2003 RAV4
>> 2021 Subaru Outback Limited=20
>>=20
>> Sent from my iPad
>> _______________________________________________
>>=20
>> Mgs@autox.team.net
>> Donate: http://www.team.net/donate.html
>> Suggested annual donation $12.75
>>=20
>> Archive: http://www.team.net/pipermail/mgs http://autox.team.net/archive
>>=20
>> Unsubscribe: http://autox.team.net/mailman/options/mgs/mvheim@sonic.net
>>=20
>=20
> _______________________________________________
>=20
> Mgs@autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation $12.75
>=20
> Archive: http://www.team.net/pipermail/mgs http://autox.team.net/archive
>=20
> Unsubscribe: http://autox.team.net/mailman/options/mgs/mgbobh@gmail.com
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div dir=3D"ltr"></div><div dir=3D"ltr">&nb=
sp; Concrete may, if thick enough, be _water_proof (think dams)  =
;but when used as a floor it is not _vapour_proof. Vapour comes right t=
hrough six inches of concrete, almost as readily as through bare earth. =
;</div><div dir=3D"ltr"> A responsible installer of tile, vinyl=
, carpet or anything else will tape a pane of glass down onto a concrete flo=
or 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 c=
ondensation; there almost always is. That=E2=80=99s why carpets on lo=
wer-level of houses will smell musty after a year or so; it is because they a=
re musty. </div><div dir=3D"ltr"> Any conscientious home b=
uilder will put a layer of 10-mil plastic sheeting on top of the crushed roc=
k before he pours the concrete. I read about one once; have never met o=
ne. </div><div dir=3D"ltr"> There are ways to seal the conc=
rete, ways of greater or lesser effectiveness. One commonly-used produ=
ct in USA is =E2=80=9CDryLock=E2=80=9D, a coating for concrete that is prett=
y 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. &nb=
sp;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=3D"ltr"> &nbs=
p;In a garage, I would work at improving ventilation before messing around w=
ith 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 o=
ne realises that ordinary window screen reduces air flow by 50%. A 12=
x20 ft garage is 240 sq feet, and really should have a vent at each end, or r=
idge vent its entire length. That is way in excess of code requirement=
s, but will reduce considerably condensation from moisture through the floor=
.</div><div dir=3D"ltr">Bob</div><div dir=3D"ltr"><br></div><div dir=3D"ltr"=
><br>On May 6, 2021, at 5:20 PM, Max Heim <<a href=3D"mailto:mvheim@sonic=
.net">mvheim@sonic.net</a>> wrote:<br><br></div><blockquote type=3D"cite"=
><div dir=3D"ltr"><meta http-equiv=3D"Content-Type" content=3D"text/html; ch=
arset=3Dutf-8">Theoretically it will form on the underside of the plastic=E2=
=80=A6 which will not be good for your carpet, which should be removed.<div c=
lass=3D""><br class=3D""></div><div class=3D"">Leave the cover off for venti=
lation, as much as possible (obviously you might want to cover the car if yo=
u are running the saw or the belt sander, or spraying paint). If you could l=
eave the windows down, at least a few inches, it would help. Surely mice can=
=E2=80=99t climb up sheer glass=E2=80=A6</div><div class=3D""><br class=3D""=
></div><div class=3D""><br class=3D""><div class=3D"">
<div style=3D"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-mo=
de: space; -webkit-line-break: after-white-space;" class=3D""><div style=3D"=
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; -we=
bkit-line-break: after-white-space;" class=3D""><div style=3D"margin: 0px; f=
ont-size: 13px;" class=3D"">--</div><div style=3D"margin: 0px; font-size: 13=
px; min-height: 16px;" class=3D"">Max Heim</div><div style=3D"margin: 0px; f=
ont-size: 13px;" class=3D"">'66 MGB</div></div></div>
</div>
<div><br class=3D""><blockquote type=3D"cite" class=3D""><div class=3D"">On M=
ay 6, 2021, at 2:06 PM, Frank Krajewski <<a href=3D"mailto:frankk12@veriz=
on.net" class=3D"">frankk12@verizon.net</a>> wrote:</div><br class=3D"App=
le-interchange-newline"><div class=3D""><div class=3D"">I have received many=
great suggestions from the list. A simple start will be to create a moistur=
e 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. Excus=
e my na=C3=AFvet=C3=A9 but what prevents moisture from forming on the tarp o=
r plastic? <br class=3D"">Frank Krajewski<br class=3D"">1980 MGB LE<br class=
=3D"">1991 Mazda Miata SE<br class=3D"">2003 RAV4<br class=3D"">2021 Subaru O=
utback Limited <br class=3D""><br class=3D"">Sent from my iPad<br class=3D""=
>_______________________________________________<br class=3D""><br class=3D"=
"><a href=3D"mailto:Mgs@autox.team.net"; class=3D"">Mgs@autox.team.net</a><br=
class=3D"">Donate: <a href=3D"http://www.team.net/donate.html";>http://www.t=
eam.net/donate.html</a><br class=3D"">Suggested annual donation $12.75=
<br class=3D""><br class=3D"">Archive: <a href=3D"http://www.team.net/piperm=
ail/mgs">http://www.team.net/pipermail/mgs</a> <a href=3D"http://autox.team.=
net/archive">http://autox.team.net/archive</a><br class=3D""><br class=3D"">=
Unsubscribe: <a href=3D"http://autox.team.net/mailman/options/mgs/mvheim@son=
ic.net">http://autox.team.net/mailman/options/mgs/mvheim@sonic.net</a><br cl=
ass=3D""><br class=3D""></div></div></blockquote></div><br class=3D""></div>=
</div></blockquote><blockquote type=3D"cite"><div dir=3D"ltr"><span>________=
_______________________________________</span><br><span></span><br><span><a h=
ref=3D"mailto:Mgs@autox.team.net";>Mgs@autox.team.net</a></span><br><span>Don=
ate: <a href=3D"http://www.team.net/donate.html";>http://www.team.net/donate.=
html</a></span><br><span>Suggested annual donation $12.75</span><br><s=
pan></span><br><span>Archive: <a href=3D"http://www.team.net/pipermail/mgs";>=
http://www.team.net/pipermail/mgs</a> <a href=3D"http://autox.team.net/archi=
ve">http://autox.team.net/archive</a></span><br><span></span><br><span>Unsub=
scribe: <a href=3D"http://autox.team.net/mailman/options/mgs/mgbobh@gmail.co=
m">http://autox.team.net/mailman/options/mgs/mgbobh@gmail.com</a></span><br>=
</div></blockquote></body></html>=
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Mgs@autox.team.net
Archive: http://www.team.net/pipermail/mgs http://autox.team.net/archive
Unsubscribe: http://autox.team.net/mailman/options/mgs/mharc@autox.team.net
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