thermal bridge free exterior

December 31, 2012

next up on skidmore passivhaus is installing the outsulation on the walls along with the rainscreen furring.

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the plywood sheathing was first covered by a weather resistive barrier with metal head flashings at the windows and doors.

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most walls get a layer of 3″ poly-iso, while the south wall will get 4″ to match the recessed pocket for the exterior shades.

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2 screws (with plastic washer) per 4×8 sheet hold it in place until the furring strips are installed.

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all seams and fasteners are taped.  the face of the insulation is treated as a second weather resistive barrier.

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additional flashings at all doors and windows will be taped to the insulation as the wood trim is installed.

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1/2″ x 2″ pt plywood furring strips run vertically to create the drainage plane.  they are held in place by just a few fasteners until the next layer is installed.

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since we are using vertical siding, a second layer of furring runs horizontally.  we used pt 1×4 as a solid nailing base for the siding.

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long fasteners secure the second layer of furring strips running horizontally through the foam to the studs.  the straightforward framing layout makes the studs much easier to locate.

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keep in mind that long fasteners get expensive.  we settled on grabber #10 x 6″ square drive coated screws (from nw staple).

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next up on the exterior is trimming windows and installing siding.

stop by again soon.

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4 Responses to “thermal bridge free exterior”


  1. […] « thermal bridge free exterior […]


  2. […] wrapped up.  the vertical siding is installed on rainscreen over rigid exterior insulation.  see this past post for more info on the […]

  3. John Says:

    Hi Jeff,
    I have just been checking out the project. Commendable undertaking, and beautiful project. I have had a difficult time on the last couple of residential projects trying to get the results as cleanly executed as you have achieved here. I appreciate the attention to details not seen and love the siding. Well done!

    John Wright
    john@wrightdesignoffice.com

  4. insituarchitecture Says:

    thanks for the nice comments john. feel free to stop by for a tour anytime. you can reach me at jeff@insituarchitecture.net.


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