Rvalue For Attic Insluation

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.

Rvalue for attic insluation.

You can achieve better thermal performance in your attic by adding an additional layer of insulation. The table below shows what levels of insulation are cost effective for different climates and locations in the home. 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. Insulation levels are specified by r value.

Your home s r value score will guide you toward the type of insulation you need. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7. R value is a measure of insulation s ability to resist heat traveling through it. 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.

How much should i add. Other considerations may include indoor air quality impacts life cycle costs recycled content embodied energy and ease of installation especially if you plan to do the. Your attic should have a certain amount of insulation in it and the recommended level of insulation for your attic is dependent on where you live. Inspecting your attic insulation.

Insulation level are specified by r value. To choose the best insulation for your home from the many types of insulation on the market you ll need to know where you want or need to install the insulation and what r value you want the installation to achieve. The r value indicates how well insulation resists heat transfer. The most effective places to add insulation to older homes are exterior walls attics basements and crawl spaces.

The higher the r value the better the thermal performance of the insulation. If your attic insulation covers your joists and is distributed evenly you probably have enough. Recycled glass or sand that s melted and spun into fibers. The higher the r value the better the thermal performance of the insulation.

In general an attic s r value should be between r 30 and r 49. The higher the r value the better the thermal performance of the insulation. Most homes are insulated in the attic and any floors located above unfinished basements or crawl spaces. R value is a measure of insulation s ability to resist heat flow.

First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation. In particularly cold climates you might go up to r 60.