[Greenbuilding] insulating around windows... best practice

Matt Dirksen dirksengreen at gmail.com
Thu Sep 5 09:31:53 MDT 2013


Found a blog post  that address this particular question:
http://arlingtonpassivehouse.wordpress.com/tag/tremco-trio/




On Thu, Sep 5, 2013 at 10:10 AM, John Salmen <terrain at shaw.ca> wrote:

> I’ve never seen that – but so many products out there. Nothing listed on
> the Canadian MSDS for the tape but the US one lists acrylate which is a
> contact allergen and polyurethane foam. ****
>
> ** **
>
> I think tape sealing the gap is more important than filling the gap as the
> idea is to leave room for building movement. We do use foam guns but I do
> think gaskets are the best as foam can get pretty rigid. (Trick with the
> foam gun is to Vaseline the can to gun connection and after using very
> tightly close up the adjustment knob and never touch it with cleaner and
> then make sure it gets used once a month at least). ****
>
> ** **
>
> Not much need for that type of filling now with exterior foam wraps. We
> are securing windows and doors to the outside foam skin using taped flanges
> (adding flanges to wood windows). Tied back to framing with strapping.
> Leaves a flexible assembly. If it is a wood window with wood liner – the
> liners are made up as part of the window (biscuit) and float with the
> window in the opening.****
>
> ** **
>
> Window details still need some work – I think ideally they should be
> recessed on the exterior to minimize wind washing but its a hard detail to
> work out.****
>
> ** **
>
> *From:* Greenbuilding [mailto:
> greenbuilding-bounces at lists.bioenergylists.org] *On Behalf Of *Alan Abrams
> *Sent:* September-05-13 4:34 AM
> *To:* Green Building
> *Subject:* Re: [Greenbuilding] insulating around windows... best practice*
> ***
>
> ** **
>
> I've heard about but never tried Tremco expanding foam tape.  It comes off
> the roll very thin, and sloowwwly expands.  You apply it to the window
> perimeter, and you have a few moments to slam the window in place, and
> level and square it up, before the Tremco swells to seal the gap.  If you
> run into a problem with the opening, or have to stop and take a leak, the
> foam expands larger than the opening, and you have to scrape it off (at
> what, a buck a foot???) and start over. ****
>
> ** **
>
> AA****
>
> ** **
>
> On Thu, Sep 5, 2013 at 3:00 AM, Reuben Deumling <9watts at gmail.com> wrote:*
> ***
>
> I like backer rod. My method has evolved into stuffing the appropriate
> diameter backer rod from the outside and from the inside around the
> perimeter of the window. Done carefully I convince myself that I'm creating
> some dead air space in between the two foam layers.
> Are there better ways of doing this?
> I am aware of and used to use a foam gun. But I never can seem to make
> sure to clean the gun when I'm done and so the next time I have to buy the
> expensive acetone cleaner and take the damn thing apart again. Which is one
> of the reasons I've switched to backer rod. ****
>
> Thanks.****
>
>
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>
>
>
> ****
>
> ** **
>
> --
> Alan Abrams*
> **certified professional building designer, AIBD
> certified passive house consultant, PHIUS*****
>
> *certified passive house builder, PHIUS
> *Abrams Design Build LLC
> *sustainable design for intentional living*
> cell     202-437-8583
> alan at abramsdesignbuild.com
> www.abramsdesignbuild.com****
>
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