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Using Open-Web Trusses as Rafters for Superinsulated Roofs

Although they are usually used as joists, deep parallel-chord trusses with solid-wood diagonal struts can also be used as rafters

Posted on Dec 6 2012 by Alex Wilson

Last week I wrote about an innovative foundation insulation material, Foamglas, that we used in our new house in Dummerston. This week I’ll talk about the open-web rafters we’re using to achieve a superinsulated roof.

First, a little background. There are several approaches to creating highly insulated roofs.


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Image Credits:

  1. Alex Wilson

Roof Trusses

Trusses Make a Stronger, Straighter Roof and They Go Up Quickly

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Image Credits:

  1. Donald Blum/Fine Homebuilding #168
  2. Courtesy Wood Structures, Inc./Fine Homebuilding #89
  3. Christopher Clapp/Fine Homebuilding #89
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