Monday, February 15, 2010



Bedroom 1 14' x 15'
Bedroom 2 14' x 15'
Full Bathroom 8' x 7'
Stair/Hall 8' x 17'8
Attics (2) 14' x 8' ea

745 sf (outside dimension)
650 sf (inside heated space)

The Second Floor of the Maison Cocagne House is designed to be the private area of the house. The main components are two bedroom areas separated by a bathroom/stair core. Adjacent to the bedrooms are attic spaces with sloped roofs. The core walls are framed as double stud walls to accommodate the heat recovery ductwork that will be discussed later. These spaces make up the thermal envelope of the main house. The bathroom is designed as a full bath located in a dormer. Cost reduction could be achieved by constructing the house with a full bathroom on the main floor and a compact 1/2 bath at the second floor (negates need for dormer). Finishes and final furnishing arrangement of areas are up to the occupant.

Windows would be high efficiency, triple glazed casements.

Maison Cocagne House is designed with double 2x4 insulated, exterior stud walls separated by a 3-1/2 inch fully insulated space to isolate the exterior walls from thermal bridging. The outside double stud walls would be erected prior to construction and erection of the interior stud walls. The inside stud walls are designed to be load bearing while the outside stud walls are designed to carry the exterior finish. The cold side of the inside stud wall is completely covered in a 6 mil vapor barrier then sheathed with 1/2 inch CDX plywood sheathing to provide lateral bracing as well as protect the vapor barrier. Experience has shown that the vapor barrier can be safely installed inside the wall as long as 2/3 of the insulation is on the cold side of the barrier. Locating the vapor barrier at the cold side of the inside stud wall allows for installation of electric without penetrating the vapor barrier. The cold side of the outside stud wall is sheathed with 1/2 inch fiberboard sheathing, then covered with house wrap. Tongue & groove sheathing can also be used at outside stud walls to facilitate insulation installation. Details for air-tightness and openings are provided in the links and will be discussed later.

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