[Greenbuilding] attaching 2" rigid foam

Reuben Deumling 9watts at gmail.com
Sat Dec 3 20:43:53 MST 2016


Great stuff. Thank you all for your suggestions and experiences. 3/4" is
very doable, In one particular area it is close, but I can make it work. 3"
long drywall screws also seems like a great idea. I have a bunch of those
left over from twenty years ago, before I ever met Robertson much less Torx
screws.

On Sat, Dec 3, 2016 at 12:14 PM, Jeff Martin <jeff at open2learn.ca> wrote:

> We've been using nominal 1 x 3s (3/4" x 2 5/8"). I agree with Clarke that
> 3/8" seems likely to be too thin. I don't think that 3/8" strips would hold
> the screws reliably or be stiff enough, although ripped strips of 3/8"
> plywood might.
>
> If trying to gain 3/8" of space is that crucial, I think the better
> solution for you, Reuben, is to temporarily hold the foam in place with the
> washered nails, then install your drywall directly over the foam, using 3"
> drywall screws. That way you'll gain the full 3/4" you would have lost
> using furring strips between the foam and the drywall. I think the main
> challenge that you'll face is hitting your studs reliably, when you're
> driving the 3" screws through the foam, especially at inside corners.
>
> Jeff
> On 12/1/2016 3:08 PM, Clarke Olsen wrote:
>
> Thew strips I was thinking of were thicker, my experience was with 2x4s;
> 3/8" is pretty thin, not much to grab.
> Clarke
>
>
> On Dec 1, 2016, at 1:04 PM, Reuben Deumling <9watts at gmail.com> wrote:
>
> I didn't have any particular glue in mind, just know that gluing sheet
> rock is done. About the furring strips, do the nails you're talking about
> go all the way through? And if so, couldn't one skip the fasteners holding
> the sheet itself and simply secure with one set through the furring strips?
> And since (in my case) the whole point here is to minimize wall thickness
> overall, how thin of a furring strip could one hope to get away with?
> 3/8"x1-1/2"?
> I realize we're trying to not split the strips with the drywall screws, or
> screws holding the assembly to the studs below....
>
> Thanks for all your suggestions. Delighted this list does still exist even
> if we've gotten kind of quiet.
>
> On Thu, Dec 1, 2016 at 8:53 AM, Clarke Olsen <colsen at fairpoint.net> wrote:
>
>> Quick hint: I found that a nail gun is essential when attaching furring
>> strips over foam. When you drive them with a hammer,
>> that 2nd, 3rd (4th?) blow will have crushed the foam. The nail gun hits
>> it so decisively, the foam says firm.
>> Clarke Olsen
>> clarkeolsendesign.com
>> 373 route 203
>> Spencertown, NY 12165
>> USA
>> 518-392-4640 <%28518%29%20392-4640>
>> colsen at taconic.net
>>
>>
>>
>>
>> On Nov 30, 2016, at 9:59 PM, Jeff Martin <jeff at open2learn.ca> wrote:
>>
>>
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