How To Install Bubble Insulation Under Metal Roofing

November 30, 2025

2 min read

To install bubble insulation under metal roofing, you need to measure your roof size, choose the right insulation type, and apply it before installing the metal panels. Bubble insulation, also called reflective insulation, helps keep your home cooler and saves energy. Metal roofs are growing in popularity because they last longer than asphalt shingles. According to industry data, metal roofing can last 40 to 80 years, which is much longer than asphalt shingles that last only 20 to 30 years. Cool roofs with reflective coatings can reduce your energy use by 16.6 percent. Let’s walk through how to do this job right.

What Size Is Your Roof?

First, measure your roof in squares. One square equals 100 square feet. According to the National Association of Home Builders, the average U.S. roof size is 2,647 square feet or 26.47 squares. Knowing your roof size helps you buy the right amount of insulation.

Use a tape measure on the ground or from a safe spot. Write down the length and width of your roof. Then multiply those numbers to get the total square footage.

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Pick the Right Bubble Insulation

Bubble insulation comes in different types. The most common is reflective foil bubble wrap. This type reflects heat and stops moisture. It works best under metal roofing because metal gets very hot.

You can also use foam insulation. Foam costs more but lasts longer. Here are common choices:

Reflective bubble wrap: $0.50 to $1.00 per square foot
Foam board: $1.50 to $3.00 per square foot
Spray foam: $2.00 to $4.00 per square foot

How Do You Install It?

Start by cleaning your roof deck. Remove dirt, nails, and old material. Bubble insulation works best on a clean, flat surface.

Roll out the bubble insulation and staple it down. Start at one corner and work across. Leave no gaps between pieces. Overlap edges by at least 2 inches. According to roofing data, cool roofs can lower indoor temperatures by nearly 6 degrees Fahrenheit in non-air-conditioned buildings. Proper insulation helps achieve this benefit.

Use 1.25-inch staples. Place staples every 6 inches along seams and edges. This keeps the insulation tight and flat.

What Comes Next?

Once bubble insulation is down, you install metal roofing panels on top. Metal roofing holds 17 percent of the residential roofing market share, and demand is rising. Metal panels attach to the roof deck with special screws. These screws go through the insulation into the deck below.

Make sure all seams are sealed with roof sealant. This stops water from getting under the insulation. Your new metal roof with bubble insulation will last for decades and keep energy bills lower.

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Connect with an experienced roofing solutions to discuss your roofing needs and schedule an inspection.