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

[Lynelle A. Hamilton]

Hi Ben,

Two things.

I have 4 heat pumps that provide zoned forced air heat.  I love them.  
Propane in Ontario is very expensive and the rates somewhat volatile. 
Electricity somewhat less so. Heat loss for the house is calculated at 
44K BTU, and the 4 heat pumps total 36KBTU. No problems and the systems 
aren't running past peak efficiency.  I do have a wood stove that I use 
on really cold days to offset the load, but that's on -30C and 
relatively rare.

I have a steel roof with no decking (soon to be installed vapour barrier 
between insulation and steel--builder's error and fixed at his cost). 
when I looked at it, CCF was an option for a steel roof, but the risk of 
rust is still present.  I'd do Rockwool.

Glad this list is still going!

Lynelle

On 2024-02-18 1:33 p.m., Mike O'Brien 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’Brien
> Sent 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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