Waterproofing under the foundation plate

A complete waterproofing system in new construction includes waterproofing the floor slab. Compared to the application on top of the concrete slab, the installation of the waterproofing layer underneath the foundation plate keeps the foundation dry and the concrete provides a better thermal insulation.

First, a primer such as KOSTER Polysil TG 500 is applied to the clean, sound, and solid substrate. KOSTER Polysil TG 500 is a standard primer that locks existing salts into the substrate, hardens the substrate, and provides a better bond between the waterproofing and the substrate.

The main area waterproofing made of KOSTER Deuxan 2C is applied in two layers with KOSTER Glass Fiber Mesh embedded in the fresh first layer. Embed the KOSTER Glass Fiber Mesh between layers as it provides an easy control of the layer thickness and absorbs the forces created by movement in the building.

Before pouring the foundation plate, plastic sheeting is installed in two layers to act as a gliding layer between the waterproofing material and the concrete. The waterproofing layer must be protected by a layer of unreinforced concrete. The vertical waterproofing is connected to the side waterproofing layer underneath the foundation plate. A fillet of KOSTER Deuxan 2C is to be installed in the connection area.

Always adhere to the specifications in the respective Technical Guidelines.



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