Following these preparation steps will increase efficiency and ensure longevity of roofing shingles. There are a few attic preparation steps required before you purchase blown-in insulation bags and rent an insulation blowing machine. Attics with more insulation have a greater number of tiny air pockets which therefore increases the insulation R-value and effectiveness. Accordingly, insulation’s resistance to conductive heat transfer is measured in R-value. These air pockets act to slow down conductive heat transfer through the insulation. Insulation has millions of tiny air pockets between its layers. Heat transfers in the form of conduction, which transfers at a rate proportional to the differential temperature between the living space and the attic space. Therefore, heat transfers from living spaces to attics in the winter and from attics to living spaces in the summer. Heat will transfer from warm to cool objects until both objects become the same temperature. The attic space is the coldest area of a house in the winter and conversely, it’s the hottest area in the summer. How attic insulation worksĪttic insulation reduces heat loss in the winter and heat gain in the summer by providing a barrier between the attic space and the living space. I hope this helps you make an informed purchase.Adding more insulation in your attic is an easy way to make your home more energy efficient as well as reduce the cost of your utility bills. To recap, the rafter vents work great and do exactly what they are designed to do, protect and provide the airspace needed for inlet air from soffits. This keeps loose fill insulation from being blown back away from edges near soffit vents and when blowing new insulation into edges, it prevents the loose fill insulation from getting blown into soffit vent area plugging up the vents. Owens-Corning rafter vents have an acordian portion that can be curved down to the top plate as a wind block. This product maintains airflow from soffit vents as designed.įeatures. Sliding insulation into position at edge of top plate, the rafter vents are rigid keeping airspace between roof deck sheathing and insulation and didn't rip/tear or crush and I had R-30 thick batts shoving into that cramped space. It didn't punch thru foam baffles, just good firm hold. Stapling into deck sheathing with a Porter-Cable air stapler only drove the staples the depth needed. Go to Arrow's website for more on metals and point types available. I used the divergent grind points that give a little twist and hold great. I used an air stapler with Arrow T50 3/8 x 3/8 crown staples. These stayed in place in my 24' on-center rafters. The competitor's products are thin, flimsy, and brittle copys. Having installed these now, I wouldn't hesitate to buy again. The price made me hesitate and Home Depot only sells online by the 70 pc. As I slid these into position, the directed air flow was amazing having a nozzle effect, increasing velocity of air from soffit vent and directing it up toward the ridge vent. There is no comparison to the rigidity, thickness and design.

Rafter baffles