Best R Value Insulation For Attic

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.

Best r value insulation for attic.

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. Existing 3 4 inches of insulation. You can achieve better thermal performance in your attic by adding an additional layer of insulation. Recommended insulation levels for retrofitting existing wood framed buildings.

Achieving greater r values in exterior walls. Here are the most common insulation materials listed in order of lowest to highest r value. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. Let s say the insulation you ve selected has an r value of three per inch and.

Add insulation to attic. Before you ever get insulation anywhere near the attic though make sure that you get the air leakage sites sealed up. 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. 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.

Therefore it needs to be fireproof. In particularly cold climates you might go up to r 60. 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. 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.

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. There are many ways to retrofit a home with fiberglass and. However cellulose is inexpensive environmentally friendly and easy to install behind finished walls. The higher the r value the better the thermal performance of the insulation.

Your home s age if your home is more than 10 year old you likely need more insulation. In general an attic s r value should be between r 30 and r 49. It is manufactured from recycled paper. Recycled glass or sand that s melted and spun into fibers.