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TOPIC: Insulation Concerns

adding metal roof & foam board insulation

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I have a gable roof, poorly insulated r-19, vaulted ceilings and asphalt shingles. 13 roof mount ventilators and a metal chimney. I would like to add 2'foam board insulation and maybe reflective insulation also. Should I go with tar paper or water shield? I have purchased nor clad metal roofing and getting ready to start this project. I need as much direction as possible sure there are several ways to do this project. All help would be appreciated.
Guest User

6/25/2009
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Is your attic ventilated? Especially in your climate I would think insulation would best be invested in for the attic (above your ceilings) rather than up on the roof. Todd Miller
Todd Miller
Isaiah Industries, Inc.

6/25/2009
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Yes, I have r-19 in the ceiling which is vaulted no attic The only way to add insulation is on the roof unless I were to pull down t&g red cedar from the ceiling.The roof has roof mounted ventilations that ron down to the soffit which is screened.
Guest User

6/25/2009
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any suggestions todd
Guest User

6/27/2009
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You can put down rigid insulation. I am not a huge fan of it as I feel it makes the roofing process a little more difficult. Make sure that the roofing manufacturer is okay with what you're doing. As far as a radiant barrier ... if it is going to be part of a tight sandwich of materials, it will lose its effectiveness and probably not be worthwhile. I would suggest either 30 pound felt or a synthetic underlayment. I would not ice and watershield the entire roof as that makes the system less breathable and that could lead to condensation issues in your case. Todd Miller
Todd Miller
Isaiah Industries, Inc.

6/28/2009
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Thanks for the advice.
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6/29/2009
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You are welcome Todd Miller
Todd Miller
Isaiah Industries, Inc.

6/30/2009
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What type of adhesive can be used to adhere the insulation to the metal roof?
Guest User

7/29/2009
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Rigid board is typically screwed down to the deck using large, plate type washers.
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7/30/2009
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Thanks. Todd Miller
Todd Miller
Isaiah Industries, Inc.

8/1/2009
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There are low rise foams that can be used to firmly adhere iso board if you do not want screws penetrating.
Aaron Scurlock
The Best in Polymer Roofing Soutions

8/25/2009
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