[Greenbuilding] attaching 2" rigid foam

[Jeff Martin]

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 
> <mailto: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 
>> <mailto: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 <http://clarkeolsendesign.com/>
>>     373 route 203
>>     Spencertown, NY 12165
>>     USA
>>     518-392-4640 <tel:%28518%29%20392-4640>
>>     colsen at taconic.net <mailto:colsen at taconic.net>
>>
>>
>>
>>
>>     On Nov 30, 2016, at 9:59 PM, Jeff Martin <jeff at open2learn.ca
>>     <mailto:jeff at open2learn.ca>> wrote:
>>
>>
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