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How to Install DIY Radiant Barrier Insulation in the Attic

  • Mark W 
Rolling Barrier Out Onto Insulation

Table of Contents

First, you will need to Measure Your Roof. See the example at the bottom of the page.

Radiant Barrier on top of the Insulation

Roll out the Radiant Barrier over your attic insulation to install a radiant barrier. Cut to length of the attic. Then staple it to the 2×4 and repeat until you cover the attic floor. Do not forget to install it over the garage. With the DIY Radiant Barrier and other DIY products, you can start saving energy right away.

Going up the Trusses

Roll out the Radiant Barrier, and cut it to length. Radiant barrier installation over the roof Trusses. You can go a long way or up the rafters. Then staple it to the 2×4 at one end. Pull the product tight and fasten it to the Trusses. Repete down the roofline. Repeat the process until you get to the top of the Trusses. And repeat until the attic is covered. Start saving energy. The DIY product is that simple—a great DIY radiant barrier product to save energy.

Why do you need Radiant Barrier?

The attic insulation will heat up because of radiant heat from the sun, making the attic and interior of your home hot. A radiant barrier reflexed the heat back to the roof, which helps prevent the attic insulation from heating up. Excellent attic insulation means a more comfortable home.

Architecture Build Building Construction, Radiant Barrier
Why Do You Need Radiant Barrier?

Measure Your Roof, Estimate

First, measure the outside length and width or what is known as the footprint of your home. Multiply that by the roof slope factor.


For example: If the foundation measured 50′ x 30′, the foundation and footprint of the attic would be 50 x 30 =1500 sq ft.

Now that you have the footprint or square footage of the attic space. Multiply the total roof square footage by the relevant pitch factor to complete your estimate for the amount of foil you will need to cover the roof slopes.

50 x 30 =1500 sqft footprint

X 1.3 pitch is 6/12

= 1950 sqft of Radiant Barrier Plus to cover your attic floor and roof rafters.

Multiply it by 1.2 to 1.3, If your roof is under a 5/12. The rooftop is easy to walk on and probably under 8′ at the highest point like most homes.

Multiply by 1.3 to 1.4: If your roof is a 6/12 thru 8/12 pitch ( slightly difficult to walk up with a ridge usually over 8′ high).

Multiply by 1.4 to 1.5: If your roof is a 10/12 pitch or higher ( very difficult or impossible to walk up, this is often considered a very steep or church-style roof)

Diy Energy Saving Solution
Roof Slopes
Close Up Photography Of Red And White Road Signage

Do’s and Don’ts:

Don’t – It is a DIY simple Product, do not overthink it.

Don’t – worry about hard-to-reach areas; Radiant Barrier is like shade. It has a cumulative effect. The more, the better.

Do – Work on open areas first, then worry about the other sites.

Do – Having a friend to help it will make it easier.

Don’t – cover holes in the bottom and holes in the top of the attic. Is there a path for air to flow from the bottom holes to the top spots? If yes, then you are good. If not, create a pathway.

Don’t – worry about the look of the Radiant Barrier Remember, it is your attic, not your living space.

Don’t – tape the seams; it is optional.

Don’t – worry; it is simple.

Do – safety first! A wood plank across the ceiling joist will help you around. Watch out for nails coming through the roof deck.

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