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Community and Q&A

Insulating a timber frame roof

NorthJersey | Posted in Green Building Techniques on

I’m going to be building a timber frame porch with exposed rafters and roof deck.

I would appreciate feedback on insulating the roof.

I plan to have a roof cross-section that looks something like this:

1×12 pine decking
Solitex Mento Plus WRB
Six inches of salvaged rigid foam insulation in 3 or 4 layers with the seams staggered and taped
1/2″ Advantech or plywood
Ice and Water Shield for the first two feet, then 30 lb. felt
Standing seam metal roof

Do you see any problems with this installation?



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  1. GBA Editor
    Martin Holladay | | #1

    Sounds OK to me.

  2. NorthJersey | | #2

    Thanks, Martin. Do you think I need the metal roof to be gapped above the felt?

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