A 750 ml can of 1-K B3 assembly foam — single-component expanding polyurethane for filling and insulating around door and window frames, service holes, cavities and gaps in blockwork.
It expands as it cures, so it fills irregular voids that mortar cannot reach, and it sets firm enough to help hold a frame in place while it is fixed properly.
Dampen the opening first, do not overfill (it keeps growing), and trim the cured foam flush before plastering or covering. Wear gloves — uncured foam does not come off skin easily.
Stocked at WPL Trading, No. 305, Kandy Road, Warakapola, with island-wide delivery. Call +94 71 302 4843.
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