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How to Buy
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Calculator
2-minute quiz

Find your
perfect insulation.

Answer a few quick questions and we'll tell you exactly what to grab off the shelf, and how many packs you need. No tradies. No drama.

Step 01
Which state are you in?
We need this to check your local code requirements
Step 02
How much floor are we talking?
Measure the area you want to insulate (under the floor, between joists)
Step 03
Pick your panel width.
Measure the gap between your floor joists. Grab a tape measure, it takes 30 seconds
Step 04
New floor, or existing floor?
This decides how the panels are held in place
Don't forget your fixings
The bits that make it work. Quietly.
2-minute quiz

Find your
perfect insulation.

Answer three quick questions and we’ll tell you exactly what to grab off the shelf — and how many packs you need. No tradies. No drama.

How much do you need?

Pack Count. Done For You. No Guessing.

Type your floor area. Pack count updates as you type. Black R1.8 is stocked in one width at 410mm wide. Wider joists route to a made to order channel on a 2 to 3 week lead time.

Open the Full Calculator
Pre-filled for Black R1.8
Product → Expol Black R1.8
Joist spacing
Your floor (m²)
Floor type
Packs you'll need —
Accessories → Z Clips
Don't forget your fixings
The bits that make it work. Quietly.

Two floors. Two install methods. Both tool-free.

Other rigid boards rely on nails and hope. Expol’s accessories hold the panel in place — properly — whether you’re retrofitting from below or building from above.

For existing floors

Z Clips

Push-fit clips that wedge between joists to hold the panel from below. No tools. No nails. No dropped panels three years later.

For new builds

Joist Saddles

Saddle fits over the top of the joist before the floor goes down. Panels drop in behind it. Faster than nailing. Stays put for the life of the floor.