Surface preparation: Concrete surfaces should be free from cavities and projecting nibs. All surfaces shall be dry and free from contamination, frost & surface laitance.
Priming: For applications on concrete, tiles or any other porous surface, coat the substrate with RHEOPRIME SB (solvent based bituminous primer according to ASTMD41) at the rate of 4-5m2/litre. Allow this coating to dry thoroughly. In time of high humidity, we recommend it should be left overnight.
Application: The RHEOSEAL membranes should first be unrolled and positioned correctly. Each roll should overlap the adjacent roll by 10cm. Once the roll has been positioned correctly, the membrane should be rolled up again, taking care not to change its orientation. Using left to right movements, heat the lower surface of the membrane with a propane gas torch. This will cause slight surface melting and the molten bitumen will adhere to the surface.
Then torch on the side overlap to the recommended size of 100mm. Continue the above method for consecutive rolls remembering end-laps must be minimum 150mm. Inspection of lap joints must be carried out to ensure total adhesion.