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Polystyrene bead cavity wall insulation diy.
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Polystyrene beads are produced to a specified size and density which remains unaltered during the installation process.
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The material is resistant to water penetration and will not transmit water across the cavity by capillary action or from below dpc level.
The use of polystyrene bead for cavity wall insulation does not prejudice the fire resistance properties of the wall.
What is expanded polystyrene bead.
Polypearl is injected as individual eps insulation beads which then form a consistent matrix inside the cavity using an adhesive to hold them in place.
They mulch them back into individual beads then reform them into underfloor insulation blocks.
Any rainwater penetrating the outer leaf will drain harmlessly to the footings.