BÖRNER K-TMS 170/3400 is a polyester based Vented Underlay, saturated and coated with high quality SBS modified bitumen. The upper side is finished with fine-grained sand; the underside consists of specially engineered low melt bitumen stripes with sand in between covered by thermofusible film to prevent roll sticking together. The stripe technology is designed to achieve partial bonding to the substrate and to allow the trapped vapour or moisture to dissipate at all directions thus preventing blistering build up.
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