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Posted by Jackson on July 10, 2007, 11:47 pm
>
>>> On Mon, 09 Jul 2007 02:29:27 -0400, MiamiCuse wrote:
>>> > 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
>>>
>>> Buy the window and door foam (blue cap) it expands about half of what
>>> the
>>> normal Stuff does.- Hide quoted text -
>>>
>>> - Show quoted text -
>>
>> Do it right and foam isnt it. Its a job for a carpenter who can also
>> flash it properly
>>
>
> Thanks. I did not explain clearly but this has nothing to do with the
> flashing. The flashing is installed between the chimney and plywood roof,
> then a layer of membrane on top, then the cement and concrete tiles.
>
> There is no leakage in the roof either. The tiles were cut around the
> perimeter of the chimney, and the gap is like a almost two inches wide.
> Tree leaves fall in there and some moisture will go under the tiles (but
> above the flashing) and come out in the weep holes at the end. I just
> want to seal off this gap as well to prevent the leaves and water from
> getting under, but there is no leak through the chimeny roof joint which
> the flashing is protecting very well.
>
> MC
>
>
>
That foam will actually absorb moisture and will certainly break down over
time. It is not an effective barrier for water, not to mention it will
degrade from exposure. Find another option. The foam is easy to apply, but
it isn't going to offer any protection from moisture, in fact, it may even
collect moisture.
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