Loose laying with ballast

New sealing

Roll out, align and smooth out the ExtruBit and ExtruPol roofing and sealing membranes. Do not stretch. Lay, align and smooth out the next membrane with a = 5 cm overlap. Repeat with the next membrane. These steps are mandatory. The roof sealing must be laid flat and bonded firmly to the supporting base at the joints and borders in line with the flat roof guidelines. If laid loosely on polystyrene insulation, appropriate measures (e.g. applying protective strips) must be taken so that the subsurface is not damaged by heat during welding. Large prefabricated membranes (80-250m2) are available through the factory to speed up the laying process. The ballast must be applied immediately after laying! Ballast loads should comply with the flat roof guidelines or DIN 1055, part 4. Increased ballast (such as board covers and/or additional mechanical fastening) may be necessary at the edges and corners. A wide range of pre-moulded components enable secure sealing in problematic areas such as corners and outlets.

Renovation

Due to chemical incompatibility, it is necessary to apply a separation layer between an existing bituminous sealing and ExtruBit/ExtruPol roofing and sealing membranes. Roof coverings containing tar (a product produced by coking or carbonising mineral coal) need to be removed. Reconstructing with mechanical fastening: when using ballast, follow laying procedures as described in 8.2.1. Beforehand, however, check whether additional thermal insulation or a protective layer is necessary.

The ballast must be applied immediately after laying! Ballast loads should comply with the flat roof guidelines or DIN 1055, part 4.

Inverted roofs

Check first if a protective layer is required! Laying ExtruBit/ ExtruPol roofing and sealing membranes follows the same procedure described in 8.2.1. Thermal insulation boards made of extruded polystyrene (XPS) are laid on top of the seal. The boards have rabbet edges and must be closely butted. A synthetic non-woven is laid on top of the thermal insulation, overlapping by about 8cm.

The ballast must be applied immediately after laying! Ballast loads should comply with the flat roof guidelines or DIN 1055, part 4.