Abstract
The aim of the study was to evaluate the wind load resistance of heat-welded seams in polymermodified bitumen for roofing membranes and to investigate the fracture behaviour of seams subjected to wind load. Wind load resistance tests of two commercial polymer-modified bituminous roofing products, namely cne styrene-butadiene-styrene copolymer (SBS)-modified bituminous product and one atactic polypropylene (APP)-modified bituminous product, were carried out in accordance with the Nordtest Method NT BUILD 307. The results showed that for the SBS product heat-welded seams of only 30 mm width could resist a wind load of over 4900 N m 2 . However, the welding of seams more than 100 mm wide, which is recommended by material manufacturers, is necessary to avoid peeling stress in the seam caused by wind uplift, since the peel strengths of polymer-modified bituminous roofing membranes are lower than their shear strengths. It was also concluded that for APP products the welding work must be carried out more carefully by allowing for pressure roller weight and welding speed.
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