Polystyrene Beads Injection for Partition Walls – Complete Guide & Tips

Guide to Injecting Polystyrene Beads into a Partition Wall

Steps to Follow:

1️⃣ Drilling Holes

Drill 32 mm diameter holes using a hole saw.

Place the holes as close to the wall as possible, at a minimum of every 50 cm, at a height of 2 meters along the partition.

2️⃣ Injecting the Beads

Use a blower injector to blow the polystyrene beads in.

Insert the tube provided with the blower directly into the bag of beads.

3️⃣ Even Distribution

Rotate the blower up and down and from left to right to fill all the spaces.

The blower automatically stops when the partition is completely filled.

Questions / Answers

❓ What should be checked before injecting beads into a partition?

✅ Ensure that all electrical switches and outlets are equipped with a protective box.

✅ If necessary, apply expanding foam behind the outlets and switches to prevent the beads from escaping.

❓ Should a binder be used to inject the polystyrene beads?

❌ No. Adding a binder (glue) is discouraged because:

• It can form clumps and create thermal bridges, reducing the insulation's effectiveness.
• It alters the insulating properties of the beads.
• A poorly dosed binder can crush the beads under its weight.
• It negates the fire-resistant property, as most glues contain flammable solvents.

💡 Tip: For effective insulation, ensure that the partition is airtight before injecting the beads.