I have a flat roof of tar and areas of rubber torch down. What can be
used in below freezing to fix a few leaks. Rubber torch needs above
55f, will that thin tar in a 5 gallon bucket at box stores work in
winter, I know the thick mastic works when hot out but in cold it wont
be pliable, and will anything bond in cold for DIY. A pro and tar
truck would cost alot.
You can keep the bucket of roof cement inside in a heated area until
you need to use it. A heat gun, or, if you're braver and careful, a
propane torch, can be used to heat up the tar so it can get into the
Roof cement is pretty thick even at 60f, its not cracks since I have
gone over everything I just cant find these leaks, Its an area maybe
8x8 I need to coat, cement would hit the cold roof and air and be
unworkable, Im sure my 250000 btu torch would just make a fire.
AMEN!! I fought flat roof leaks for years at our church and finally
talked them into getting a slope on it. Problems solved. It doesn't
need to be a big slope, just enough to get the water to run off. A 2'
drop across 30' with commercial roll roofing & properly installed did
A few years ago our county bit the bullet and did a multimillion
dollar refit of the HS flat roof. They wised up and put a peaked roof
(around 4 in 12 by the looks of it) over the flat roof.
Why architects design buildings with roofs gauranteed to leak is
beyond me. I can see it for huge buildigns but in residences or
reasonably sized ones it is asinine.
If the flat roof has those little parapet walls, you can fake things
with built-up contoured layers of foam insulation over the old deck,
with the new membrane roof layered over it. Usually cheaper than adding
a whole peaked roof, and the added insulation helps the HVAC load. Only
hard part is adding the drains or scuppers to lead the water away.
I used to be the Chair of a Strata Council with 3 buildings. For
emergency repairs I would put a liberal amount of dry concrete over the
spot (flatten out about 1" thick). As long as the roof stayed wet the
patch will hold. Then on the first dry day have the roof fixed.
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