Proper Way To Insulate A Roof With Blown In Insulation

Before insulating seal any air leaks and make roof and other necessary repairs.

Proper way to insulate a roof with blown in insulation.

If you re insulating the roof directly. Loose fill insulation is blown into the attic or walls. There are three types of blown in insulation. Blown in blanket is a loose fill material held in place in walls or ceilings by netting.

Insulating the attic and roof. If it is located in a conditioned part of the house also remember to insulate and air seal your attic access. Insulate and air seal any knee walls vertical walls with attic space directly behind them in your home as well. Rigid board insulation is intended for use in confined spaces such as exterior walls and cathedral ceilings.

Roughly a quarter of the average home s heat is lost through the roof. An advantage of spray foam is it s quick whereas foam board needs to be cut and measured which can be a chore. Basically if you spray or stuff insulation into a wall cavity in an existing building pay close attention to the type and condition of the wiring that may be in the cavity. The three most common types of blown in insulation are loose fill fiberglass cellulose and rock wool each with its own pros and cons.

If the studs are 16 5 inches on center and you re using batts made for 16 inches you ll have a crack on each side that air can move through says tom. Because blown insulation comes out as chunks of cellulose or fiberglass it does a better job of filling every crevice of the attic. High density damp spray is used in the attic or walls. Pre 1930s wiring which poses a fire hazard to insulation material.

To insulate the roof itself you either use spray foam or retrofit with it with rigid foam board. Fiberglass insulation gets its r value from the amount of air it traps between its fibers. In this case it s best to use cavity filling foam or blown in insulation. Some common insulation methods can actually cause long term damage.

The insulation itself can burn or melt in some cases or can over insulate a wire or connection causing a fire which causes the structure itself to burn. With a more complete layer of insulation throughout your attic you ll experience lower energy costs and more effective heating cooling compared to simple batts installations.