Attic Conditioned Space

However you do not describe the potential uses for that space and that gives me pause as to how to properly evaluate the risks of your options.

Attic conditioned space.

In warmer climates unvented attics can prevent the condensation that occurs on ductwork in some vented attic spaces. If you re considering turning your attic into conditioned storage or living space it s worth changing tactics to insulate between the rafters and wall joists instead of the floor. A fundamental requirement of an unvented attic assembly is the use of air impermeable insulation on the underside of the unvented roof to prevent air infiltration and exclude airborne moisture from the attic. You can insulate the rafter space provided that you leave a ventilation space between the top of the insulation typically fiberglass batts or blown cellulose and the underside of the roof sheathing section r806 1 ventilation required.

Compact assembly or hot roof ventilated roof assembly. Hire a pro to install spray foam insulation. You can use rigid foam panels or do as tom silva does with nearly all houses these days. Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts.

The intended purpose was to allow warm air and moisture to escape. In a roof attic assembly the builder has two choices. In the winter any small air leaks in the attic probably not through the foam but elsewhere leak air out and the warm humid air from the conditioned space refills the attic providing a fresh supply of humidity that can replenish the reservoir of humidity in the roof deck. An unvented attic assembly a k a.

The loss of energy efficiency means some designers choose to move the ductwork into the conditioned areas of the home and leave the attics unvented. Your stated goal is to turn your attic into a non vented conditioned space. An outdoor unit which houses the fan condenser and compressor and an indoor unit which holds the evaporator and fan. Building america research has demonstrated unvented conditioned attics can substantially improve energy performance while allowing home builders to continue locating hvac systems in the attic space.

Traditionally building codes have required attic ventilation. Making the attic a conditioned space taking the building envelope to the roof is a good approach and will save energy another approach is to use radiant coated deck sheathing seal all ceiling attic penetrations and blow in r 60 insulation as it will cost less than spray foam and should give at least the same energy efficiency to the home. The attic space becomes indirectly conditioned as a result of the air leakage heat transfer and vapor diffusion through the ceiling.