How To Insulate An Attic Plus Porch Roof Rafters

To cut blanket style insulation place the product over a piece of plywood with its paper or foil side down.

How to insulate an attic plus porch roof rafters.

Step 1 measuring the space. Install ventilation baffles into the space between the rafters before you install the insulation usually by stapling into place. On new construction in northern nj spray foam companies are huge advocates of insulating at the rafters. But if the floor is covered in plywood you can t stuff enough insulation beneath it to do the job sufficiently not even in warm climates.

Insulating a finished attic there are two basic ways to insulate a finished attic. Lay a two by four on top temporarily compressing the insulation to a manageable. If 180mm is to be installed then 100mm board might be introduced between the rafters there has to be a minimum 25mm air gap between the insulation and the underside of the tiles or slates with an 80mm board running across the rafters. I am an advocate of spray foam but my experience tells me that unless there is much ductwork in the attic the attic plane is very complex or there is a very low ceiling height i would rather seal and insulate any ductwork properly and insulate at the attic floor to keep the overall.

Airspace from the soffit to the ridge by installing a continuous air chute in each rafter bay. Plan to pull up the flooring and layer new insulation on top of the old. Staple them directly to the roof decking for better insulating roof rafters. In this case the area behind the knee wall will be uncomfortably hot or cold.

With a warm roof the usual process is to split the insulation into two layers. How to insulate roof rafters. If only the living space will be insulated wrap the insulation around the room s walls and ceiling and then continue along the floor of the non living space. To effectively ventilate your roof create a 1 in.

Step 2 cutting and fitting the insulation. Attach the insulation to the rafter scab board by the paper flange so as not to compress the fiberglass. First climb into the attic and use measuring tape to determine the square footage of the space. If your attic is going to be converted into livable space then you will need to insulate the roof rafters.

Use 3 8 inch heavy duty staples every six inches. Staple it to the rafters or scabbed on boards with a staple gun so that the paper backing is toward the interior of the room to act as a vapor barrier.