Garage Roof Insulation R Value

R value is a measure of insulation s ability to resist heat traveling through it.

Garage roof insulation r value.

Recommended home insulation r values. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. The owens corning garage door insulation kit is popular option that uses easy to install pre cut panels. If the garage is open to the rafters the boards that support the roof use r 38 insulation between the rafters at the roof if they are 10 inches deep.

The brand states their product provides 5 times better thermal performance when compared to an insulated door which is very impressive. However if you have a cathedral style garage roof you will need a scaffolding to get into the upper areas of the roof. 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 can insulate the walls ceiling and door of the garage to the highest r value possible but if you fail to fill those air gaps you ll still be wasting a lot of heat.

The higher the r value the better the thermal performance of the insulation. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. Eps is used under roofing over foundation walls and beneath siding. If you have a flat garage roof and an attic above you can install the garage insulation from below using a standard ladder.

Garage door insulation spray foam insulation faced insulation soundproofing insulation. In terms of the installation owens corning claim that it takes approximately 1 hour and all that is required is a tape measure knife straight edge and. Insulation level are specified by r value. The table below shows what levels of insulation are cost effective for different climates and.

In either case you will need to follow the general steps below to insulate your garage roof. This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. 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. Garages typically aren t built to be airtight and have lots of air gaps to the outdoors.

It provides an r value of 4 per inch of thickness and is the cheapest type of foam board insulation. If the joists are 10 inches deep the cavity can take high density r 30 insulation which is 8 1 2 inches thick more than enough for floor insulation. This is due to the limited amount of spacing that s available on the back of the garage door. It s also important to realize the value of air sealing in conjunction with insulation.

Typically you re only going to be able to apply insulation with an r value of around r 8 or r 12 to the door.