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| Howdy. I closed in a porch. It has 2x4 rafters. I have some 2" pressed fiberglass (?)furnace duct board someone gave me. I'm thinking of cutting it into strips and using it between the rafters. It would still allow a 1-1/2" space above it for heat to travel from the soffit to the roof vent. The duct board has foil on one side but seems flimsy. Does my insulation plan make sense or am I heading for trouble? Thanks, Gene |
Follow-Up Postings:
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| Hello, again. I should clarify that the duct board is rigid and okay. Its outside foil is flimsy and peels off quickly. Gene |
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- Posted by energy_rater_la (My Page) on Sun, Jul 29, 12 at 13:48
| don't know what you hope to achieve.. ductboard isn't much insulation value R-8 at most. adding batts would give you more R-value and use the ductboard somewhere else. air sealing these porches to be able to heat and cool them is always an issue. I've gotten lots of calls to homes where they best of luck. |
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- Posted by energy_rater_la (My Page) on Sun, Jul 29, 12 at 13:56
| thought about it a bit more and realized that you may be wanting to put layers of ductboard for insulation. ah so! IF you remove the silver vapor barrier you can if you are hoping for a radiant barrier the I pay about $30 per 10x8 sheet of ductboard best of luck. |
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| Thanks for helping. Issues with trying to make conditioned space from a porch is very well said. Mine was a deck. The interior ceiling insulation matter and the interior wall covering is all that remains to resolve. The room is only around 170 square feet with eight insulated windows, an exterior door, and patio doors accessing the main part of the house. It's not on the primary heating system. Even before my first post I knew I couldn't insulate the 2'x4' ceiling as I wished. I have a carport beneath the room and I insulated the room's 2x10 floor joists pretty well. I've read what you said several times. I'll keep it in mind. Many thanks. Gene |
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| Carport open or closed? Need vapor barrier under floor if closed for CO protection. (maybe if open too-check codes) |
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| Thanks for the reminder, busboy. The carport beneath the closed in porch is open on three sides. I've given thought as to whether I might wish to ever enclose it so it would conform with the two car garage beside it. I did cover the carport ceiling with 4x8 sheets of luan. I'll keep the vapor barrier in mind. Regards, Gene |
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