Insulating A Roof Without Felt

He also found a water stain on the living room ceiling and recommended that the.

Insulating a roof without felt.

Roofing felt was introduced primarily to act as a secondary barrier against wind driven snow and rain but its use also causes a reduction in air movement within the roof space particularly if the roofing felt is impervious and this effect is often compounded by the introduction of insulation. Insulate and try to keep from reaching the dew point. Add a preinstalled membrane to absorb and release the condensation as it forms with the natural weather cycle. 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.

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. If the roof is nailsick the slates should be removed with a proper slate ripper and checked for cracks and kept for reuse. 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. When the home inspector checked the roof he found that the new shingles were installed without a layer of felt.