"MiamiCuse" wrote in
:

Is there any guideline on how much of the expansive foam to use? I
have a chimney and where it meets the concrete roof tiles the gap is
too large for caulk or sealant. As a matter of fact I can fit two
fingers along one edge and there is a small crevice under the tiles as
well where they meet. Even though I am pretty sure there is flashing
underneath I will still feel better if I can fill the crevice along
the perimeter.

I thought I would use those foam that expands, however last time I
used it I did a poor job of it and underestimated how much to use and
it ended up expanding and cracking the surface I put on top of it. I
wonder what is the best way to gauge how much to apply.

Thanks,

MC




As Ransley said, flashing is the right way to do it. Here's an article on
the way it should be done.

http://www.rd.com/content/printConte...ontentId=17758

I've yet to fix a leaking chimney that was done this way but maybe that's
why they leaked, ya think? Ones I've done this way never leaked. Yep it
requires time, work & tools.