The "VISQUEEN 25MTR 300MU BBA" refers to a BBA-certified Damp Proof Membrane (DPM), a heavy-duty black polythene sheet (300 microns/1200 gauge) sold in rolls of 25 meters by 4 meters (100 sq. m.) used in construction to prevent ground moisture from rising into concrete floors and protecting buildings. It's durable, made from recycled materials (often 90%+), and offers effective waterproofing for solid ground slabs, meeting rigorous standards like BS EN 13967.

Key Details:

Brand: Visqueen (a well-known name in construction membranes).
Type: Damp Proof Membrane (DPM) / Polythene Sheeting.
Size: 25 meters (length) x 4 meters (width).
Thickness: 300mu (microns) / 1200 gauge, indicating heavy-duty quality.
Certification: BBA (British Board of Agreement) approved (e.g., certificate 94/3009), ensuring quality and compliance.
Material: Recycled low-density polyethylene (LDPE).
Color: Black.
Function: Creates a barrier against liquid water and water vapour from the ground, used under concrete floor slabs.

In Simple Terms:

It's a strong, thick plastic sheet you put down on the ground before pouring concrete to stop dampness from coming up into your house or building, meeting official UK standards.