Can you help with passive solar greenhouse exterior wall details?

Rick Carter
Updated: Sept. 24, 2020

I have started construction on a 38'x20' passive solar greenhouse. 2x6 framed walls on south side with many windows. Struggling a bit on:

1) Best insulation type to go between studs. 

2) If I should have a vapour barrier, or let the wall breath (high humidity inside). Location and type of vapour barrier. 

3) best rigid insulation type to create a thermal break / if that rigid insulation should be breathable.   

Trying to avoid moisture condensing inside the walls. We live in NW Alberta - will attempt to use the greenhouse early March to late October. Have had -30c in early March. 

Thanks for any opinions offered.   


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