Insulating Between The Ceiling And A Low Slope Roof - Insulation - Page 2 - DIY Chatroom Home Improvement Forum
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Old 08-28-2019, 11:40 AM   #16
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Re: Insulating between the ceiling and a low slope roof


@jaketrades With all the work you are doing I think it is foolish to put off the new roof. With what ever you use for insulation and if you do a proper seal on the ceiling it will be some time for a leak to show up and could bring major repairs again. With a new roof you might look at the insulation from a different angle.
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figure 7-14
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Old 09-08-2019, 02:30 PM   #17
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Re: Insulating between the ceiling and a low slope roof


Batts work with new construction but even then the actual R-value is roughly half of the specification due to air movement along the edges. Closed cell provides double the R-value per inch of foam and it waterproofs the ceiling in the event of a roof leak.
As already mentioned adding 4 inches of solid foam prior to adding the roofing will help a great deal if that is an option.

Problem with closed cell is that the feds have allowed companies to continue to use ones containing isocyanates and other chemicals that can cause severe asthma and death and carcinogins as well. Contractors recommend not being in the house for 24 hours after applying the foam but the required time is 72 to 100 hours to have the attic space off gassing vented to the outside completed and the air in the house to be safe for its occupants. Contractors do not want to lose jobs by having people add in the cost of spending 3-4 nights at a hotel and meals at restaurants.
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