Perlite Masonry Insulation

The physical character of expanded perlite lends itself to a variety of special purposes – including use as loose-fill masonry insulation.


Insulation: Thermal performance tests have shown significant energy savings when perlite is used to fill the cavities in concrete masonry structures.

Permanent: Perlite is an inorganic, naturally occurring mineral and is as permanent as the walls which contain it. It supports its own weight and will not settle or bridge.

Economical: Perlite insulation offers excellent thermal and fire resistant properties at an economical cost. It is lightweight and pours easily and quickly without requiring special equipment or skills.



The perlite should be installed in the following locations:

  • a. In the cores of all exterior (and interior) hollow masonry walls.
    b. In the cavity between all exterior (and interior) masonry walls.
    c. Between exterior masonry walls and interior furring.
  • The perlite should be poured directly (or via a hopper) in the top of the wall at any convenient interval (not in excess of 20 ft [6 m]). Wall sections under doors and windows should be filled before sills are placed. Rodding or tamping is not recommended.
  • All holes and openings in the wall through which perlite can escape should be permanently sealed or caulked prior to installation. Screening should be used in all weep holes. (The inclusion of weep holes is considered good construction design practice to allow passage of any water which might penetrate the cavities or core spaces of wall construction.)
  • The perlite must remain dry. Suitable means should be used as the work progresses to insure that the insulation is protected from inclement weather.

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Source : Perlite Institute