Scissors truss insulating | Ask Mason Knowles - SPF Consultant | Spray Foam Technical Questions and Answers | SprayFoam Magazine Q&A Forums

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Chris Klar Posted: Jun 02, 2009 01:39 PM	Scissors truss insulating I am building a addition, 20x24 with 8/12 pitch outside, 6/12 pitch inside scissor trusses. What is the best way to sprayfoam insulate this style of ceiling?
mason Posted: Jun 02, 2009 02:19 PM	I would insulate the underside of the roof sheathing in an unvented attic configuration. Depending on the design of the scissor trust you would probably not be able to spray foam to the top side of the ceiling's interior sheathing and vent the space above it.

Author

Comments

Chris Klar

Posted: Jun 02, 2009 01:39 PM

Scissors truss insulating

I am building a addition, 20x24 with 8/12 pitch outside, 6/12 pitch inside scissor trusses.
What is the best way to sprayfoam insulate this style of ceiling?

mason

Posted: Jun 02, 2009 02:19 PM

I would insulate the underside of the roof sheathing in an unvented attic configuration. Depending on the design of the scissor trust you would probably not be able to spray foam to the top side of the ceiling's interior sheathing and vent the space above it.

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