Insulating an area is a vital part of any construction project. The materials used are just as important for safe and effective results. Whether working on a residential or commercial building, many construction companies chose natural materials to comply with green building initiatives and sustainability codes. Learn how perlite—a naturally occurring siliceous rock—is used as loose-fill insulation and the benefits it affords.

Production of Perlite for Use

You may recognize perlite as the small white pebbles in potting soil used to improve aeration and moisture retention. But did you know its natural properties also makes perlite an excellent insulator?

Once perlite is mined, it’s processed in granular and powder form to fulfill a wide range of applications, including insulation. When perlite is heated, its water content vaporizes and creates tiny bubbles that gives the mineral its lightweight, porous features. Since it’s a naturally sourced material and safe and easy to use, it’s no wonder expanded perlite is a top choice for the following applications:

• hollow masonry wall units
• under floor insulation
• leveling old floors
• ceiling tiles
• roof decking
• fireproofing around chimneys, doors, rooms, and safes
• low-temperature equipment, such as cryogenic tanks

To better understand why perlite is used this way, let’s look at the benefits perlite brings to each application.

Benefits of Perlite as Insulation

There are many reasons why perlite is widely used as loose-fill insulation. Here are a few:

• All natural. Perlite is considered a green building material.
• Low toxicity. Unlike alternatives like fiberglass, perlite is not associated with hazardous risks.
• Inert. Since it doesn’t contain chemicals, it won’t corrode piping or other electrical utilities.
• Pliable. When poured into concrete block cavities, perlite fills holes and crevices while flowing around rough, uneven areas.
• Sound reducing. Since perlite effectively fills in voids between the walls, it’s able to reduce sound transmission.
• Moisture-resistant. Perlite’s porous nature makes it useful in areas exposed to water or dampness.
• Fire-resistant. Its insulating properties helps prevent excessive heat transfer and slows the spread of fire.
• Decay- and vermin-resistant.

Now that you where perlite insulation can be used and why it’s an effective choice, let’s explore how to use it.

How to Use Perlite Loose-Fill Insulation

The lightweight nature of perlite makes it easy to handle whether in board or loose-fill form. Loose-fill insulation is typically poured into the cavities of masonry walls, concrete block cores, and areas between exterior and interior walls. Before you install it in the attic or floor, there are a few considerations to make first:

1. Clean the area. Remove any old insulation and debris. While perlite can fill in any gaps, it’s important to clear out any potentially hazardous materials first. It also makes it easier to assess the area for required repairs.
2. Repair damage. Fix any cracks or holes in the area.
3. Ensure dryness. For optimal effectiveness, the area should be completely dry before installing the perlite.
4. Installation. For smaller areas, pour the perlite directly into the openings. Use a blower to precisely distribute perlite into larger areas.
5. Monitor coverage. Poke through the perlite with a rod to ensure even distribution. This helps prevent cold spots.
6. Seal openings. Use caulk or foam to close any openings to prevent the perlite from escaping and pests from entering.

Chemrock Cryogenics proudly offers bulk supplies of high-quality perlite for a variety of applications, including loose-fill insulation. Whether it’s for extremely cold cryogenic storage or heated construction projects, perlite is the natural choice. Contact us to learn more and to discuss your insulation needs.