Insulating Attic Rafter With Chimney

R value for fiberglass or wool batts per inch is between r3 and r3 5.

Insulating attic rafter with chimney.

Hire a pro to install spray foam insulation. 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. While insulating your attic space with foam can be an effective way to lower heating costs you can use a simple reflective foil material as a cost effective alternative. Place the plastic sheeting on top of the rolled insulation.

For houses with 2 6 rafters it s necessary to increase rafter depth to make room for enough insulation to meet code minimums. If there is a floor you will need to remove it to properly insulate the roof rafters. With a helper to load the blower with insulation as needed start at the perimeter of the attic and work toward the attic access door. With a warm roof the usual process is to split the insulation into two layers.

Roof insulation configurations for unvented rafter truss assemblies. You get a free blown in machine. Images courtesy simpson gumpertz heger. If the rafters are deep enough it may be possible to use rigid foam as the ventilation baffles sealing along the perimeter of each piece to create an air barrier then filling the rest of the cavity with batts or blown insulation see ceiling remodel.

Easiest insulation for layperson to install fairly inexpensive r value doesn t fluctuate as with loose fill. 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. Do not use plastic sheeting in this case. Batt insulation packages contain more square feet than rolls.

Blown in insulation is installed using blowing machines. If the plastic sheeting is in pieces overlap the pieces by 8 inches and staple it in place directly to the roof rafters and the wall. Find a pre screened local home insulation contractor. Rolls are usually used for long expanses such as length of floor for entire attic while batts are fit between studs in attic rafters.

From flat to cathedral in fhb 192. Ibc dictates acceptable placement and composition of roofing materials in chapter 15 but describes required thermal efficiency of the roof in chapter 13 which references the international energy conservation code iecc the minimum required thermal resistance varies. We love our diyers so take up our incentive to improve your attic insulation situation yourself. You can use rigid foam panels or do as tom silva does with nearly all houses these days.

By stapling the foil sheets to your attic roof rafters you can reflect the heat that hits the rafters back down into your home s living space. Fill every joist space completely and evenly with the insulation leaving attic vents uncovered.