The roof in question is mineral roll roofing over a sunroom. It has
been in place for many years and regularly receives a new coating of
brushable roof sealer.
My question: There are a couple of places where the roof puddles
badly, and historically these have been the source of leaks if I do
not recoat on almost an annual basis. I would like to level these
indentations. I had thought of using trowlable roofing cement but
really would like something pourable, which would dry hard and could
be then coated with roof sealer.
Is there anything petroleum or non-petroleum based that might
work? I have considered liquid fiberglass, floor leveler, etc but
thought I should ask the experts.
Thanks for your help.
Please do not confuse me with an expert.
Size matters here.
I would cut a piece of fiberglass window screen to match the pocket or the
center of the pocket if it is large, lay down a layer of fiberated roof
cement, embed the fiberglass and top it with another layer of cement.
Repeat as necessary over a period of time, allow each layer to dry well (30
days in summer heat) before adding another layer. You have to keep the coats
thin or they will crack
Once the water does not puddle, add your regular top coat at the end of the
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Thank you all for your interesting comments. I do think Red Green's
idea has merit. I would plan to spend some time cutting concentric
circles from asphalt shingles, slathering each with cement as I added
another one. I don't believe the problem would shift if done correctly
as the roof has had the same pattern of indentations for many years.
As for other fillers, the foam etc might work too but I see no
reason it would be better than the shingles.
I have considered a re-roofing with a rubber membrane but that
would be too expensive for me right now, plus it would take the fun
out of a creative solution, even if the creative solution required
much more attention over time.
On Tue, 7 Jun 2011 16:54:23 -0400, "Colbyt"
Any commercial roofing company can sell you slabs of foam designed to
contour flat roofs with. Carve as needed with whatever stone-age tools
you can come up with, glue down, and slap a square of membrane over it
and glue it down.
I used to have a flat roof that did that. They make pumps that
automatically will pump water off of roofs.
I talked to a roofer about fixing it and for another 1000 bucks (or
something) he said he could fill the dips in with special thick roofing
I would get a roofer in to do a tear off, repace what's sagging so you
have a flat roof again, and cover with the new rubberized stuff.
Probably be cheaper in the long run than getting up there all the time
and horsing around with fixes. BTDT.
Just the "peace of mind" might make it worth it.
I have a similar problem with two garage roofs.
I heard a suggestion about cement using using something like polystyrene
peanuts as aggregate (to reduce the weight), but I haven't tried is since I
don't have the recipe.
If anyone's heard of such a concoction, let me know.
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