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Irishvoyageur

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Reply with quote  #1 
I am building a long zero pass SAH and will soon be adding the glazing (twin wall 8mm polycarbonate). I saw a post where someone used silicone to make a gasket for the edge of the collector. I am think about using high temperature synthetic felt between the inside surface of the panel and the edge of the frame (treated wood). I would then use some type of EPDM material between the top side of the glazing and aluminum angle, which will secure the panel to the frame and hopefully provide a weather seal for water infiltration. I will likely add a small bead of silicone to the edge of the aluminum channel where it meets with the panel to provide additional water protection. Any thoughts on these plans or possible alternative ways to seal the panels to the frame while still allowing panel removal should the need arise?

gbwillson

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Reply with quote  #2 
Irishvoyageur-

Depending on the seal, both DPDM rubber and felt work, although I have some concern if the felt absorbs water. I'd be hesitant to use any gasket material that isn't resilient. You don't want it to flatten or squish so flat that there essentially isn't a gasket. Using pure silicone caulk is the best if you want to try sealing up AFTER assembly, although it can be messy unless you tape things off you don't want siliconed. I do recall someone basically squirted silicone caulk into a channel, or groove, they had cut into the side of a 2x4 with a router and filled with silicone. Wax paper was used to line the groove. Once cured, the silicone was carefully removed from the channel and placed into position. I don't recall how this worked out. But the idea is interesting in that you can make the gasket as thick or as wide as desired. Custom gaskets, and very cheap! My friend Craig used extra strength double sided industrial foam tape to seal and attach the glazing to the corner angles. Worked really well, but you have to be very careful as once the tape touches a surface, that's pretty much where it's going to stay! The glazing and corners were attached to each other and then he bolted the two to the collector box. 

Greg in MN
Irishvoyageur

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Reply with quote  #3 
Thanks for the info. Do you recall the brand of "industrial foam tape" used by your friend?
gbwillson

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Reply with quote  #4 
He used 3M Scotch Extreme Mounting Tape. There are many brands available, But 3M has a very good reputation. LLP in another brand that is cheaper, and has tested well. i just don't know about how well it performs longterm.

Greg in MN
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