Best R Value Insulation For Attic

Recycled glass or sand that s melted and spun into fibers.

Best r value insulation for attic. Where you live different climates require different insulation r values. You can achieve better thermal performance in your attic by adding an additional layer of insulation. Existing 3 4 inches of insulation. Therefore it needs to be fireproof.

You will need a higher r value of insulation if you live in the northeast than if you live in southern california. Achieving greater r values in exterior walls. In general an attic s r value should be between r 30 and r 49. Loose fill cellulose is rated between r 3 2 and r 3 9 per inch making it one of the least efficient insulation materials available.

If you put an air permeable insulation material over a hole in your ceiling you may have comfort indoor air quality durability and efficiency problems. Add insulation to attic. Recommended insulation levels for retrofitting existing wood framed buildings. Your home s age if your home is more than 10 year old you likely need more insulation.

It is manufactured from recycled paper. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. You only need four inches of r 3 5 cellulose in a wall cavity to exceed the recommended insulation level of r 13 for walls located in zone 4. Cellulose has an r value of 3 5 inch thickness.

Before you ever get insulation anywhere near the attic though make sure that you get the air leakage sites sealed up. Let s say the insulation you ve selected has an r value of three per inch and. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. But newer homes in central and southern arizona are insulated to ratings of r 30 to r 38 while newer homes in northern arizona generally have attic insulation at r 60 because of colder winters.

Here are the most common insulation materials listed in order of lowest to highest r value. Cavity wall insulation technique determining what is the best house insulation polyurethane foam has the highest r value 6 5 inch thickness of all the spray in insulation but it is also the most expensive. However cellulose is inexpensive environmentally friendly and easy to install behind finished walls. There are many ways to retrofit a home with fiberglass and.