Insulating A Roof Without An Attic

For the same reason insulation shouldn t touch the roof s underside.

Insulating a roof without an attic.

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. In practical terms you can choose between mineral wool or insulation boards. Batt insulation can be added to the underside of the roof between rafters and a layer of batt or loose insulation can be added over the attic flooring. To install the air chutes staple them directly to the roof decking.

Insulating the attic floor. Check around windows or vents and examine the perimeter looking for tiny gaps or holes. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. This may pose a problem for the longevity of your roof as these ceilings also typically do not have enough room to allow for proper air flow of the roof.

If you ve ever wondered why your attic has insulation it s because it acts as a barrier against temperature extremes. After a snowstorm this heat aids in melting the snow more quickly thus minimizing the snow load on. And having insulation in your attic keeps the area at a consistent temperature. Once air leaks have been addressed you can add insulation.

Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away. To effectively ventilate your roof create a 1 in. Airspace from the soffit to the ridge by installing a continuous air chute in each rafter bay. You may also insulate your roof to help regulate the temperature in an attic that is a part of your living space.

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. If you do not use the attic much it is pointless heating this area. Insulating the roof is a priority if the ceilings of your home happen to be part of the roof deck as is the case with cathedral ceilings. Materials commonly used for the insulation of the roof deck include.

Staple them directly to the roof decking for better insulating roof rafters. This is because without attic insulation heat typically rises in the house and warms the roof.