MasterSeal® 621 is a brown rubber/bitumen liquid emulsion with excellent adhesion which dries to a tough black seamless, flexible damp-proof and vapour-proof membrane. It is a thixotropic cold applied bitumen emulsion with added rubber latex.
A high build bitumen / rubber latex emulsion. Surface applied, flexible, damp and vapour-proof liquid membrane All surfaces to which it is applied must be sound, stable with an even finish and free from dirt, dust, loose debris, grease etc.
It may be applied to damp but not waterlogged surfaces Hot, very dry or porous surfaces should be dampened with a priming coat before it is applied.
Where subsequent coats are to be applied, the first coat must be dry.
Application
Tanking and damp-proofing structures: to provide an impervious damp-proof membrane on concrete and brick. Floors: to provide a sandwich membrane in new construction or a surface treatment. Walls: for interior and exterior walls. Roofs: for the maintenance of many types of roofs including built-up felt, asphalt, lead, zinc, aluminium, concrete, lightweight screeds, timber, slate, asbestos cement, corrugated iron, and as a vapour barrier
Dosage
Apply 2 or 3 coats as recommended of a high build rubber/bitumen emulsion such as MasterSeal 621 as manufactured by Master Builders Solutions, or similar approved.
Standards
Fire Classification – BS EN ISO 11925 Part 2 /BS EN 13501 Part 1:2007 + A1:200 *Refer to TDS for more information.