[Greenbuilding] SIP and Drainback Solar Hot Water system

[Mike Forbes]

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