Cellulose Insulation In Attic Ceiling

Blown in cellulose has a higher r rating and is less expensive than either blown insulation like fiberglass attic insulation or fiberglass batts.

Cellulose insulation in attic ceiling.

For example cathedral ceilings built with 2x12 rafters have space for standard 10 inch batts r 30 and ventilation. Or whole house fans. Cathedral ceilings must provide space between the roof deck and home s ceiling for adequate insulation and ventilation. This can be achieved through the use of truss joists scissor truss framing or sufficiently large rafters.

Loose fill cellulose insulation can settle around and conform to most of the obstructions found in walls and attics. You can achieve better thermal performance in your attic by adding an additional layer of insulation. This can prove advantageous at reducing the overall weight of the product on the ceiling drywall helping prevent possible sag. The r values of both insulations will accumulate.

This reduces settling and decreases the amount of cellulose needed. Manufacturers also add borate for fire and insect resistance. 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. 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.

Loose fill insulation comes in a variety of materials. Cellulose insulation is made from recycled paper products. The types of insulation that were most commonly made with asbestos are loose fill also called blown in insulation. 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.

Foam insulation may be made from polystyrene polyisocyanurate or polyurethane which are all types of plastic. Cellulose blown in ceiling insulation is a good choice for diyers. In spite of all their benefits neither fiberglass nor cellulose insulation provides an adequate air seal. Given that both insulators are equal in r value the difference in thermal resistance relies heavily on proper installation and air sealing.

Or attic staircase hatches. Recycled glass or sand that s melted and spun into fibers. It is applied with a very small amount of water to activate an adhesive of some kind. When walls are already finished injecting loose fill cellulose insulation is one of the few ways of adding.

But there s probably nothing to prevent air from moving past plumbing air duct and electrical penetrations. Sure there s insulation in your attic and crawlspace. Pick up the blower and insulation. 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.