[Greenbuilding] ***SPAM*** Re: ***SPAM*** Re: ***SPAM*** Wet-spray insulation

[Mike O'Brien]

Hi, Lynelle—

There’s 2 inches of high density foam under the roof sheathing. It’s partly helping stiffen the rafters, as there is an ecoroof on the top surface, about 4 inches deep. It’s around R-14, which seemed adequate to avoid condensation—and, the high density foam does not transmit water vapor. So there is no vapor barrier on the batts. We run exhaust fans every day to draw in outside air, which helps ensure the humidity is low to mid-range. 

Best, Mike
Sent from my iPhone

> On Jan 7, 2023, at 2:59 PM, Lynelle Hamilton <lynelle at lahamilton.com> wrote:
> 
> Mike,
> 
> I'd assume that the gable is sealed (foam) at the outer side. Did you also use a vapour barrier on the warm side of the batts?  How did you calculate the condensation point? Do you have any problems with moisture?
> 
> Thanks!
> 
> Lynelle
> 
>> On 2023-01-07 5:36 p.m., Mike O'Brien wrote:
>> Hi, Reuben—
>> 
>> The green building list seems dormant, but happy to chat with you. We have two different roofs on our house. One is a gable with a sloped ceiling below. We blew high-density foam on the under side of the roofing plywood, then added R-38 batts between the rafters. The other roof has a flat ceiling under it, with R-49 blown-in cellulose (not damp spray). Our general was Dave Heslam, who now works at Earth Advantage in Portland, his crew did the insulation. Hope that helps.
>> 
>> Best, Mike
>> Sent from my iPhone
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