Cellulose Insulation In Attic Ceiling

But there s probably nothing to prevent air from moving past plumbing air duct and electrical penetrations.

Cellulose insulation in attic ceiling.

Cellulose insulation is made from recycled paper products. Or whole house fans. Given that both insulators are equal in r value the difference in thermal resistance relies heavily on proper installation and air sealing. Stabilized cellulose is used most often in attic roof insulation.

For example if your attic already has fiberglass insulation blankets installed you can improve its r value by installing blown in cellulose insulation on top of the blankets. Cellulose insulation is usually a loose fill insulation. This can be achieved through the use of truss joists scissor truss framing or sufficiently large rafters. The types of insulation that were most commonly made with asbestos are loose fill also called blown in insulation.

Manufacturers also add borate for fire and insect resistance. If your attic or wall insulation is in batt or blanket form whether it s fiberglass cellulose or another material you generally don t have to be concerned about asbestos. The r values of both insulations will accumulate. Or attic staircase hatches.

When walls are already finished injecting loose fill cellulose insulation is one of the few ways of adding. Loose fill insulation comes in a variety of materials. This can prove advantageous at reducing the overall weight of the product on the ceiling drywall helping prevent possible sag. You can achieve better thermal performance in your attic by adding an additional layer of insulation.

For example cathedral ceilings built with 2x12 rafters have space for standard 10 inch batts r 30 and ventilation. Cathedral ceilings must provide space between the roof deck and home s ceiling for adequate insulation and ventilation. Lighter in weight than cellulose or mineral wool but it settles more than those materials so you ve got to put in a thicker layer to get the protection you need. In spite of all their benefits neither fiberglass nor cellulose insulation provides an adequate air seal.

Blown in cellulose has a higher r rating and is less expensive than either blown insulation like fiberglass attic insulation or fiberglass batts. Loose fill cellulose is relatively inexpensive yet still has an r value of about 3 5 per inch of thickness compared to fiberglass r value between r3 to r4 per inch. The r value of cellulose insulation ranges from 3 6 3 8 per inch and spray foam insulation ranges from 3 5 3 7 per inch of insulation. It is applied with a very small amount of water to activate an adhesive of some kind.

Foam insulation may be made from polystyrene polyisocyanurate or polyurethane which are all types of plastic. Recycled glass or sand that s melted and spun into fibers. Cellulose blown in ceiling insulation is a good choice for diyers. This reduces settling and decreases the amount of cellulose needed.