Building Homes or Extensions/Insulation under cedar

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Expert: - 10/24/2008


Question
Hi,
 I have a very old house (1890) and am residing under the front porch.  I removed the existing cedar shakes, horizontal cedar boards, and am now down to 1x10 planks (sheathing).  I would like to put down 3/4" insulation and than cedar shingles.  However, several manufacturers say that I am not able to do this or they do not have a product.  Can I put down 1/2" insulation, than 1/4" plywood, tyvek, and than the cedar shingles?

Thank you very much for you help,
Debbie

Answer
Debbie,

The very best R value will come with Poyisccanurate.  This material can be purchased already bonded to plywood and nailbase product to assist in ventilation.

Here is a web address to become familiar with the product:
http://www.pima.org/ContentPage/ContentPage4,36.html

Here a technical bulltins on details:
http://www.pima.org/ContentPage/Bulletins.html  

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Dan Griffin

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I can answer almost all questions related to the total construction process. My expertise is in commercial construction, though I can field most any residential question. I have hands on experience in concrete, heavy equipment, masonry, all phases of carpentry, interior finishes, and I am fairly strong in mechanical and electrical.

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I have over 20 years experience as a commercial carpenter and commercial construction superintendent. I have another 20 years experience in facility management for a major school district.

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My favorite hobby for he past 12 years has been singing bass in a The OkChorale men's barbershop chorus and the Mature Moments quartet.

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I hold a Bachelor's degree in English and Math. I have completed many continuing education hours in the building trades. I hold a Master Carpenter card from the AGC, Associated General Contractors.

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