Vapor Barrier For Attic Cieling And Florida

Attic spaces designed by a florida licensed engineer or registered architect to eliminate the attic venting.

Vapor barrier for attic cieling and florida.

This acts as a barrier to keep heated moist air from rising up into the attic during cold weather. For example installing a radiant barrier in an attic that already has high levels of insulation r 30 or above would result in much lower energy savings than in an attic insulated at a low level r 11 or less. Attic insulation should always be installed with the paper backing facing toward the living space the ceiling in this case. On the other hand an air barrier a properly detailed air tight drywall ceiling for example in the absence of a vapor barrier can be effective since it stops the flow of vapor laden air.

The amount of thermal insulation affects the potential radiant barrier energy savings. Rosemary june 5 2015 at 3 03 pm. To know if you need a vapor retarder ask yourself a few basic questions. Some regions don t require a vapor barrier.

Whether or not you need a vapor retarder hinges on three main factors your climate your home and the location of the wall you re insulating. Whether using loose fill or batts put the vapor barrier closest to the warm side of your installation where hot moist air would get in facing the house s interior in cold climates beneath floor insulation and the attic s interior in hot climates on top of floor insulation. A vapor barrier in an attic assembly in a severely cold climate with the absence of an air barrier will likely be ineffective. My question is should iuse a vapor barrier inthe attic floor.

Fbc section 1203 2 newer studies newer ashrae studies have found that the practice of attic ventilation to be detrimental to structures in warm humid climates. Of vent opening is needed for every 150 square ft.