[Greenbuilding] SIP and Drainback Solar Hot Water system

[Keith Winston]

If it's easy you could add the Armacell, but I think the airspace would 
suffice, as long as the copper is no actually incontact with the EPS. 
These are flat plate collectors, after all.

Keith


Mike Forbes wrote:
> Hi all,
> I'm just finally sitting down with a beer after installing the roof portion
> of my drainback system. I have a question regarding melting points and am
> hoping someone might have an opinion on this.
>
> What i have:
>
> 12" SIP roof (EPS foam) w/ metal roofing
> 128 sq. ft flat plate collectors (4 - Sunearth EP-32's)
> approx 30' of 3/4 copper run to storage tank
> Armacell pipe insulation everywhere except where it penetrates the roof.
>
> What i'm wondering:
>
> as i was making the roof penetration I started thinking about the temps the
> pipe would expect and what that would do to the EPS foam in the SIP.
> Looking at the MSDS on EPS foam it begins to soften at 175-220 degF for most
> of the SIP manufacturers out there.
>
> What I did:
>
> Drilled a 2" hole through the roof.
> Made a copper pipe insulator to hold the 3/4 copper in the center of the
> hole
> Used a silicone boot to seal the hole from the weather along with the smelly
> sealant...
> There is approx 1/2"-5/8" airspace around the copper pipe going through the
> SIP.
>
> What should I do:
>
> a) nothing, the airspace will keep the EPS from getting too hot
> b) put Armacell (230 degF working temp) around the 3/4 pipe in the SIP
> c) something else, suggestions?
>
> Thanks a bunch,
> Mike
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