Expansive foam

	Expansive foam

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Subject

Author

Date

Expansive foam

MiamiCuse

07-09-2007

hobbes

Meat Plow

ransley

MiamiCuse

Jackson

Al Bundy

Oren

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Posted by MiamiCuse on July 9, 2007, 2:29 am

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

Posted by hobbes on July 9, 2007, 6:18 am

> 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

You could try and use some backer rod. This is a foam which is tube
shaped and available on a roll. You stuff this into your gap first.
Then fill up the remaining bit with caulk.

You can get this stuff at Home depot.

http://www.rd.com/content/openContent.do?contentId=19689

Best, Mike.

Posted by Meat Plow on July 9, 2007, 7:48 am

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.

Posted by ransley on July 9, 2007, 8:47 am

> 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

Posted by MiamiCuse on July 9, 2007, 11:58 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

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