expanding foam around windows

atlonglast

Windows being installed in a few weeks and the sales rep. mentioned putting expanding foam around them which I know is not airtight, so I told him not to bother as airtight tape would be going on them. However, should I just let them put the foam on(as well as the airtight tape)?

BryanF

atlonglast wrote: »

Windows being installed in a few weeks and the sales rep. mentioned putting expanding foam around them which I know is not airtight, so I told him not to bother as airtight tape would be going on them. However, should I just let them put the foam on(as well as the airtight tape)?

Yes, why not. have you detail you can show us of where the foam is going?

martinn123

Be careful with expanding foam around windows which are not reinforced.
The expansion can cause the frame to warp, if the installer is a bit generous with the foam.
Would prefer to see you use fixings on the side of the frames.

gman2k

Use the Hilti airtight expanding foam, which is
1. Airtight &
2. Won't damage frames
But it is expensive. I would be still taping up the windows on the inside as well though.

sydthebeat

gman2k wrote: »

Use the Hilti airtight expanding foam, which is
1. Airtight &
2. Won't damage frames
But it is expensive. I would be still taping up the windows on the inside as well though.

are you talking about the CF 812 or the CF 1 750?

gman2k

sydthebeat wrote: »

are you talking about the CF 812 or the CF 1 750?

http://www.hilti.ie/holie/page/module/product/prca_rangedetail.jsf?lang=en&nodeId=-97914

sydthebeat

yeah thats specifically designed for air tightness..... but wouldnt be in common place use by contractors

gman2k

sydthebeat wrote: »

yeah thats specifically designed for air tightness..... but wouldnt be in common place use by contractors

That's because it's on the expensive side!!!!

beyondpassive

That hilti foam is good, however costly. I routinely use expandable tapes around the frame then airtight tape on the inside reveal.

Do-more

beyondpassive wrote: »

That hilti foam is good, however costly. I routinely use expandable tapes around the frame then airtight tape on the inside reveal.

Could you kindly PM me the name of the expandable tape you use BP.

beyondpassive

PM sent

atlonglast

Thanks for all the help. I'm still undecided what to do. I doubt the foam is Hilti as I'd say the window company is just using cheap stuff. Will check it out though. Beyond Passive could you pm me the name of the tape please?

Main reason I'm against it is if it affects the frame as the windows have only a little steel reinforcement.

Do-more

atlonglast wrote: »

Beyond Passive could you pm me the name of the tape please?

To save BP the hassle I can tell you that he didn't know the name of the tape, it was an unbranded roll given to him by a window company.

Google is probably your best bet.

When I looked Google through up some university research in Norway into airtightness sealing around windows.

My reading of their research was that carefully applied airtightness tapes with no holes was the best solution.

The expanding sealer on its own did let some air through and their were issues associated with using the correct size tape according to the gap that had to be sealed.

So it wouldn't be a preferred option to use the expanding sealer on it's own but I imagine that using it in conjunction with an airtightness tape could be worthwhile in reducing the likelihood of air leaks.

heavydawson

beyondpassive wrote: »

That hilti foam is good, however costly. I routinely use expandable tapes around the frame then airtight tape on the inside reveal.

BP, can you possibly PM me the tape details. Thanks!

Do-more

gman2k wrote: »

http://www.hilti.ie/holie/page/module/product/prca_rangedetail.jsf?lang=en&nodeId=-97914

I just went to buy some of this foam as I need to fill a gap beside an RSJ and be sure it is air tight and the product seems to be discontinued.

Anyone know more or can point me in the direction of a comparable product?

Cheers.

gman2k

Do-more wrote: »

gman2k wrote: »

http://www.hilti.ie/holie/page/module/product/prca_rangedetail.jsf?lang=en&nodeId=-97914

I just went to buy some of this foam as I need to fill a gap beside an RSJ and be sure it is air tight and the product seems to be discontinued.

Anyone know more or can point me in the direction of a comparable product?

Cheers.

where did you try and buy the foam? I had to go to Hilti in Finglas to get mine.

Do-more

gman2k wrote: »

where did you try and buy the foam? I had to go to Hilti in Finglas to get mine.

I was looking to buy it online direct from Hilti (but I'm in Sweden) and the CF 812 is not listed on the Swedish Hilti website and so I checked the link you posted and it's gone from the Irish website also.

I'll give Hilti a ring later today and see what the say.

[Edit] I rang Hilti here and they never had the CF 812 here and only list the CF I750, they checked with Hilti Germany and they don't have the CF 812 so it looks like I am out of luck.