Fiberglass Batt Insulation

Fiberglass batt insulation is one of the most commonly used and cost-effective insulation types for residential and commercial buildings in Ontario. It comes in pre-cut, flat panels—called “batts”—made from fine glass fibers bound together to form a thick, fluffy sheet. These batts are designed to fit snugly between studs, joists, and rafters, making them ideal for insulating walls, floors, ceilings, and attics.

There are two types of fiberglass batts:

• Faced batts: Include a kraft paper or foil vapor barrier to control moisture.

• Unfaced batts: Do not include a barrier and are often used in layered or interior applications.

R-Value & Installation Considerations

Fiberglass batts are labeled with an R-value—a measure of thermal resistance. In Ontario, R20–R24 is common for walls, and R60+ is ideal for attics.

⚠️ Important: For fiberglass insulation to perform at its rated R-value, it must be installed at full thickness. If compressed (for example, squeezed into tight cavities), the insulation’s effectiveness is significantly reduced. In fact, studies have shown that compressed batts can lose up to 50% of their thermal resistance.

To avoid this, our team ensures:

• Full cavity coverage without compression

• No gaps, voids, or air leaks

• Proper vapor barrier installation (e.g., 4-mil plastic sheeting in most Ontario climates)

Rolls vs. Batts: What’s the Difference?

While fiberglass batts come pre-cut to standard lengths, rolls are continuous sheets of the same material. Both serve the same purpose, but rolls are useful for long, uninterrupted spaces, while batts are better suited for framing with frequent studs or joists.