***SPAM*** Re: [Greenbuilding] ***SPAM*** Re: Remodeling concerns

[Beatrice Dohrn]

I also am facing a very labor intensive repair this spring of a low slope roof insulated with Polyiso, an EPDM membrane over top and sleepers and a deck over that.  Seems that insects have chewed enough tunnels to compromise the integrity of it all. 

Suggestions for replacement?  Is there rockwool that can be structural at about 7"?  I haven't started research.  The un-install and re-install will be a nightmare and I won't completely know what it going on until I open it all up. I am in Western Oregon (Eugene) and I ain't opening it until the rains leave.... 


Beatrice Dohrn 
 

    On Sunday, February 18, 2024 at 10:39:57 AM PST, Mike O'Brien <obrien at hevanet.com> wrote:  
 
 Hi, Ben—
Our house plans specified closed-cell foam in our roof, but without asking, our general contractor installed open cell foam. Now, 16 years later, there is rot in the roof sheathing and a very expensive repair job ahead. So I would caution against ever specifying either foam, as a mistake can be catastrophic years later.
Best, Mike O’BrienSent from my iPhone

On Feb 18, 2024, at 8:13 AM, Benjamin Pratt <benjamin.g.pratt at gmail.com> wrote:



Hi. I've been on this forum for many years, but I am not an architect or qualified expert.  I came across this article today and had some concerns about this project. 
1. By air source heat pump, I assume they mean mini-split(s). I did some calculations rencenty and found that electricity is about 9 times more expensive per therm than gas. Combining with the very cold temperatures we typically get, I imagine The bill will be higher than if they had a gas boiler. Also, they now have to deal with uneven temperatures throughout the house and leaving doors open to all the rooms they want heated.  What do you think?
2. I have read about dangers of using spray foam in an old house--especially the potential for rot.  What do you think?   
This article reads as an advertisement for doing this sort of remodel without mentioning any of the potential downsides.  I'd love to hear your thoughts.
https://www.mprnews.org/story/2024/02/18/renovating-old-1909-st-paul-house-into-all-electric-green-home

Ben Pratt

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