Zinc roofing DOUBLE LOCK

pitchedmetal lookpitch from 2% to 20%

Double lock standing seam roof Proven, versatile system for roofing flat, curved and ‘free-form’ roofs. Weather-tight down to 7º of pitch, 3º if seams are sealed.. Discrete joints give a light, elegant appearance. Modern profiling and seaming machines facilitate short installation times. On-the-roof detailing uses folding techniques or soldered joints – no mastic! Items such as snow guards and life line attachments are readily available. The standing seam joint The joint requires 70mm of material to make. Cross joints Transverse joints vary according to roof pitch. They are needed to introduce expansion joints on large roofs or around details. Installation The system is installed across the roof in either direction, or preferably outwards from a centrally placed undercloak – undercloak tray that ensures trays of equal width (and therefore symmetry) at both ends of the roof. Dimensioning and fixing If the length of the roofing trays is over 1,5m the clips used to secure them to the substrate must allow the zinc to expand and contract, and these trays use a combination of fixed clips and sliding clips to accomplish this. The position of the fixed clip zone depends on roof pitch – to avoid the trays from buckling, the steeper the pitch, the higher the anchoring band of fixed clips is positioned. The thermal movement generated in the trays is accommodated by a gap introduced in the detail at the foot and at the head of the trays.