PintaPolar hitsattava hiilenharmaa (PintaPolar Torch Top coal grey 8x1 m)

Top layer together with Underlay is a two-layer waterproofing system from BMI, made for roofs with particularly high demands on the waterproofing layer. The system consists of an upper layer (Top) and an under layer (Underlay), both based on SBS-modified bitumen. SBS increases the elasticity of the waterproofing layer and provides increased joint strength and service life. Two separate waterproofing layers provide a good protection against leakage. The under layer can also be used as a temporary seal while the rest of the roof is completed. Products are either welded or glued with liquid bitumen into the substrate. In this EPD it has been assumed that the product is fully welded. 

Two-layer waterproofing systems are defined in the product standard EN 13707 Flexible sheets for waterproofing.