The use of bituminous products is a standard solution for positive side waterproofing of basements. The systems are applied in a paste-like form and are seamless. They are easy and safe to use, and have crack-bridging properties. On clean, solid, stable, gypsum-free mineral substrates, KOSTER Polysil TG 500 is applied as a primer. This immobilizes salts present in the substrate and the solidifies the substrate. When preparing to waterproof on top of old bituminous coatings, KOSTER Bitumen Primer is used.
Pipe and cable penetrations are sealed with the permanently plastic putty KOSTER KB-Flex 200 and protected by a layer of KOSTER KB-Fix 5. These areas can be connected with a fillet of the thick film sealant or fitted with flanges.
To protect against water creeping behind the lower waterproofing connections, KOSTER NB 1 Grey mixed with KOSTER NB 1 Flex is applied first. To prevent stresses in the waterproofing, fillets are installed at wall / floor junctions.
The actual area waterproofing is achieved using KOSTER Deuxan 2C in two layers. KOSTER Deuxan Professional can be spray applied. KOSTER Glass Fiber Mesh is recommended in all thick film sealants and applications. This allows for a better control of the coating thickness and safely absorbs movement in the building.
Before backfilling the positive side, waterproofing is to be protected from mechanical damages and settling with KOSTER SD Protection and Drainage Sheet.
Always adhere to the specifications in the respective Technical Guidelines.