Insulating A Roof Without Felt

Depending on your climate you ll need r 30 to r 49 to meet code which is 5 to 8 1 2 inches of polyiso rigid foam which is r 6 per inch.

Insulating a roof without felt.

I would lean toward adding rigid foam either on top of the roof or on the inside under the joists if reducing headroom isn t a problem. Insulate and try to keep from reaching the dew point. Traditionally we ve insulated the roof panel to try and keep the temperature on the panel from reaching the dew point. The roof can usually be insulated under the rafters with sheet insulation and incorporate a vapour barrier.

He also found a water stain on the living room ceiling and recommended that the. Loft insulation against rafters on an old roof with no felt lining under the tiles i want to make more use of the loft space and ideally want to insulate and board up the roof to create an clean insulated space. Roofing felt may be necessary for use with your shingles to meet a class a fire rating when shingles are evaluated for their fire ratings it is done on a small test deck with the roofing felt underlayment in place without this underlayment the shingles alone may not meet the class a fire requirements. Add a preinstalled membrane to absorb and release the condensation as it forms with the natural weather cycle.