We sell Umbrella Bolts / Roofseal Alderon RS Trimdeck White. The function of the roof seal is to optimize the strength of the UPVC roof screw so as to reduce leakage during the screw installation process with a screw hole closing system so as not to widen and spread pressure over a wider area.
In addition, we also sell Polycarbonate / Polycarbonate Roof and PVC Roof ALDERON & SUNPANEL & Alderon RS.