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Passive House

Passive House - Air Sealing

Passive House - Air Sealing

As this building comes out of the ground, it is crucial to continue the tight air barrier in this Passive House.  The details of the buildings are designed so that every possible break in the air barrier can be managed.  Our crew is well equipped with some of the best tapes in the industry, including the Tescon Vana tapes seen in these images.  

Air barrier comes up from under the footing to be taped to the under slab layer

Air barrier comes up from under the footing to be taped to the under slab layer

After the air barrier has been sealed, the masons pour the concrete slab

After the air barrier has been sealed, the masons pour the concrete slab

Every seam is sealed with special tape - this is the Tescon Vana

Every seam is sealed with special tape - this is the Tescon Vana

In order to become a certified Passive House, homes must pass a final blower door test in order to comply with .6 air leakage requirement or LESS. For context, Maryland homes only have to have 3 or lower to pass the energy code. 

CMU Block air barrier is kept long, ready to overlap and be taped to plywood sheathing. 

CMU Block air barrier is kept long, ready to overlap and be taped to plywood sheathing. 

tape! tape!

tape! tape!

Every penetration coming up through the slab, is sealed with the same tape

Every penetration coming up through the slab, is sealed with the same tape

Passive House, Mountain Lake Park - Insulation

Passive House, Mountain Lake Park - Insulation

Earlier this summer we started construction on a Passive House in Mountain Lake Park. The home was designed for a local couple who have had their heart set on building a sustainable home for years.  The owners began working with Carri Beer, AIA, LEED AP, from Brennan and Company Architects, and Passive House consultant Michael Hindle. 

The Passive House has many energy efficient and sustainable details.  Below are some photos of the excavation, foundation, and footing insulation.  

The footings bear on a cellular glass insulation block called FOAMGLAS from Pittsburgh corning, and the under slab, interior and exterior of the footings have Roxul Rockboard mineral wool insulation. 

FOAMGLAS - Cellular glass insulation

FOAMGLAS - Cellular glass insulation

FOAMGLAS insulation

FOAMGLAS insulation

FOAMGLAS under footing insulation, with Mineral Wool Insulation on exterior side

FOAMGLAS under footing insulation, with Mineral Wool Insulation on exterior side

Exterior Insulation - Mineral Wool; Rub-R-Wall waterproofing on concrete block

Exterior Insulation - Mineral Wool; Rub-R-Wall waterproofing on concrete block

Exterior Insulation - Mineral Wool

Exterior Insulation - Mineral Wool