Mylar Tape used for Insulation


Mylar reflective insulation, also known as Mylar tape, is comprised of polyester and aluminum, resulting in a silver-colored radiant barrier that reflects radiant heat. It keeps your home cooler in the summer and warmer in winter. This type of insulation is commonly used to insulate roofs and attics. Mylar insulation generally reflects 97 percent of radiant heat in the home, potentially cutting home energy costs significantly. Mylar insulation is so effective that even NASA uses it to shield the International Space Station against the thermal radiation of the sun and the bitter cold of space. Mylar insulation is available in different weights. And heavier weight equals better performance.

This time, we will teach you how to use Mylar tape for hot climate and cold climate insulation. First of all, let’s see the hot climate insulation.

Firstly, measure the horizontal length of your attic rafters. Add 1 foot of length to the measurement. Measure and mark the roll of insulation at both sides of the sheet, according to your final measurement.

Then, using a straight edge, draw a line between the two marks. Cut along the line with scissors. Lay the sheet horizontally, working left to right. Start at the bottom of the rafters. Staple the Mylar sheet to the bottom of all rafters. Place the staples about 3 inches apart.

Now, repeat the above steps until you reach the peak. Leave a 3 to 5 inch gap between the top sheet of Mylar and the ridge to retain proper air flow. And then repeat process on the opposite side of the roof.

Then, the insulation for cold climate. Firstly, the same as the above method, measure the length of your attic floor. Measure and cut pieces of sheeting to match.

Next, starting in a far corner, roll out the sheeting. Lay it loosely on top of existing insulation for proper air flow. And lay another sheet of insulation next to the previous one, overlapping the sheets about 1 to 2 inches. Use small pieces of foil tape to join the pieces at 1-foot intervals.

Now, cut the foil to fit around obstacles such as bracing or supports. Cut a slit in the foil, place it around the obstacle, and tape it back together. Continue the process until the attic floor is completely covered. Make sure there are no gaps.