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buffalobillpatrick · 01-02-18, 02:01 PM

House is a 1-1/2 story walk out basement.

Earth covers about 50% of the main level walls, this will help it stay cool in the Summer & warm in the Winter.

As all the insulation is on the inside, the outside structure will get cold, design temperature is +2*F but on rare occasion it can drop to -25*F

This makes it very important to have a near perfect water vapor barrier in the walls, as water will condense at the Dew Point (but not inside impermeable foam).

All of the 2 layers of foam boards have a 3/4” gap around each perimeter, this was filled with GreatStuff closed cell spray foam, they are my vapor barrier.

air at 70*F & 20% Relative Humidity (RH) becomes 100% RH at 32*F

That is Pikes Peak off to the East.

01-02-18, 02:01 PM	#48
buffalobillpatrick Master EcoRenovator Join Date: Mar 2014 Location: Florissant, Colorado Posts: 599 Thanks: 814 Thanked 59 Times in 55 Posts	House is a 1-1/2 story walk out basement. Earth covers about 50% of the main level walls, this will help it stay cool in the Summer & warm in the Winter. As all the insulation is on the inside, the outside structure will get cold, design temperature is +2F but on rare occasion it can drop to -25F This makes it very important to have a near perfect water vapor barrier in the walls, as water will condense at the Dew Point (but not inside impermeable foam). All of the 2 layers of foam boards have a 3/4” gap around each perimeter, this was filled with GreatStuff closed cell spray foam, they are my vapor barrier. air at 70F & 20% Relative Humidity (RH) becomes 100% RH at 32F That is Pikes Peak off to the East. Attached Images Last edited by buffalobillpatrick; 03-09-18 at 11:15 AM..