When spraying foam insulation to the roof deck of my existing house, why is it necessary to remove the existing insulation from the attic floor?
When spraying to the roof deck, we are creating a “Conditioned Attic Assembly,” a code-defined configuration, which requires that the attic be semi-heated and cooled. There are two ways to accomplish this: remove the insulation and vapor barrier from the ceiling below, and let the attic temperature and humidity be altered through the sheetrock and the openings for lights, fans, and other fixtures, or put enough HVAC outlets in the attic to semi-condition the area, the same way that would be done in a conditioned crawlspace.
Related Questions
- I am building a house with a sealed attic; i.e., with foam insulation applied to the underside of the roof decking. Can I install a gas furnace or water heater?
- When spraying foam insulation to the roof deck of my existing house, why is it necessary to remove the existing insulation from the attic floor?
- On an existing project, is it necessary to remove the old roof prior to the installation of a new EPDM roofing system?
