Recommended Attic Insulation R Value

Insulation level are specified by r value.

Recommended attic insulation r value. The recommended r value for attic insulation in ontario is between r 50 and r 60. In general an attic s r value should be between r 30 and r 49. Insulation levels are specified by r value. The two distinct types of attic insulation are loose fill material also commonly known as blown in insulation and batting.

Recycled glass or sand that s melted and spun into fibers. The r value of the insulation for every inch of thickness depends on the type of insulation. Recommended home insulation r values. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type.

The higher the r value the better the thermal performance of the insulation. R value is a measure of insulation s ability to resist heat flow. Your home s r value score will guide you toward the type of insulation you need. 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.

Add the right kind of insulation. The higher the r value the better the thermal performance of the insulation. The amount of insulation recommended for your home will vary depending on a number of factors. See the department of energy s doe ranges for recommended levels of insulation below.

A good thermal barrier along a building envelope such as high r value insulation in the walls attic and raised floors as well as multi paned glass help to reduce conduction. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. R values of common types of insulation. R value is a measure of insulation s ability to resist heat traveling through it.

The table below shows what levels of insulation are cost effective for different climates and. Where you live different climates require different insulation r values. Achieving greater r values in exterior walls. The higher the r value the better the thermal performance of the insulation.

Find your zone on the map and then use the above insulation r value chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. The transfer of heat by contact with solid objects such as the ceiling walls or floor is called conduction see figure 1. In particularly cold climates you might go up to r 60.