INSTALLATION METHOD– On Attic Floor Joists

1. Always exercise caution when working on

insecure floors – place a board on the attic

floor, to stand on during installation.

2. This application involves the installation of

a radiant barrier directly on the attic floor, overtop

of existing mass insulation.

3. As shown in Figure 3, the radiant barrier material

should be installed perpendicular to the floor

joists.

4. Affix the radiant barrier to the joists using regular

staples, 6” apart. Be sure to leave a 6” gap around

the perimeter of the attic floor, so as not to interfere

with any ventilation mechanisms.

*Check local building codes for compliance before installation. This installation sheet is intended solely to illustrate the proper location and placement of MRB’s

Reflective Insulation products in specific construction applications. They are not intended to illustrate proper construction methods – which is ultimately the

responsibility of the builder or contractor. The installation instructions are only recommendations relating to the location and placement of MRB’s Reflective

Insulation products, and MRB Building Products makes no claims that these construction systems are universally accurate.

**All warranties and performance estimates are void if MRB Reflective Insulation products are used in exterior applications, or in non-enclosed systems or

buildings.

***Exercise caution when using MRB Reflective Insulation products near and around electrical wiring and devices.

Note on Attic Ventilation:

A vented attic with a radiant barrier is a very different system from an un-vented attic with the same radiant

barrier.

Common types of attic ventilation are:

● Soffit to Ridge ● Soffit to Gable ● Soffit to Soffit ● Gable to Gable

Most codes require at least a 1 to 300 ventilation rate. What this means is that for every 300 square feet of floor

space, there should be one square foot of free vent area.

-Reflective Insulation Manufacturer’s Association (RIMA)