Take A Thermal Break

3405 Views 7 Replies 4 Participants Last post by neolitic, Jan 17, 2010

neolitic

Discussion Starter · Jan 8, 2010

A problem bugging me
that needs to be solved before
I can put in stools and aprons
on some JeldWen clad windows.
They have no thermal break on
the sills in their new design.
The aluminum that the stool
will butt into sweats/frosts like a ......

The problem is at the red arrow,
and that is where the stool slips in.
The groove in the wood above is just
a profile detail, not made to accept stool.

I filled the void space under the extrusion
with foam, and covered it with Vycor
to create a vapor barrier, but that just moves
the condensate to the face of the Vycor.

My last thought is to cover it with
1/4" foam tape.
I think I'll finally get to talk to a
JeldWen "expert" this morning,
but I'm not expecting much from him.

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TimelessQuality

· #2 · Jan 8, 2010

I like the foam tape idea...

Maybe install the stools
a little shy of contacting the al....
creating a little airgap??

I always run into a similar problem with steel frame basement windows..:furious:

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house bldr

· #3 · Jan 8, 2010

I'm guessing they are going to tell you that your stool will act as the thermal break, buffering the cold aluminum from the warmth of the house,not that it is right but I've never seen a window or door company admit fault willingly.We have a new home built last year with ice on the inide of their windows after temp swings the window rep says " oh thats perfectly normal".uh huh sure it is!

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neolitic

Discussion Starter · #4 · Jan 16, 2010

Just to follow up.
The Jeld-Wen warranty guy
had never heard of such a PROBLEM.

¼" stick on closed cell foam tape
stopped the condensation in cace
anyone else runs into this.
I think I will put it on if I use these
windows again, no matter what
time of year. :thumbsup:

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Tom Struble

· #5 · Jan 17, 2010

thanks for the heads up Neo,i never even thought about that before:notworthy

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neolitic

Discussion Starter · #6 · Jan 17, 2010

If you come in the house and there's
condensate running down the walls...
you'd think about it too! :laughing:

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Tom Struble

· #7 · Jan 17, 2010

yea looking at the detail closer theres bound to be condensation where the metal meets the wood

that could have easily been 2 seperate extrusions
or 1 extrusion and a wood shim

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neolitic

Discussion Starter · #8 · Jan 17, 2010

tomstruble said:
yea looking at the detail closer theres bound to be condensation where the metal meets the wood

that could have easily been 2 seperate extrusions
or 1 extrusion and a wood shim

I would have expected something.
Maybe it wouldn't be an issue
once it's trimmed out, but
I never thought of stool and apron
as being "air tight."

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