T-22 Cover Width 1070mm RAL 3009/8019

T-18 and T-22 (corrugation height 18 and 22 mm) are used on facades, soffits and the roofs of family houses; T-35 and T-45 (35 and 45 mm) on the roofs of halls, because a higher corrugation carries a greater purlin spacing and sheds the water faster. Cover widths: T-18 = 1100 mm, T-22 = 1070 mm, T-35 = 1035 mm, T-45 = 1000 mm.

The cover width is the usable width of the sheet after the overlap with the neighbouring one: T-18 = 1100 mm, T-22 = 1070 mm, T-35 = 1035 mm, T-45 = 1000 mm. The overall width of the sheet is greater by the corrugation that goes into the overlap, so the quantity of sheet is calculated from the cover width multiplied by the number of sheets.

With self-drilling screws with an EPDM sealing washer (4.8×16 and 6.3×19): GT F2 4.8 × 35 to 4.8 × 80 mm for a timber substructure, GT02, GT3, GT5, GT12 for a steel one. The screw goes into the trough of the corrugation, at right angles to the sheet, with the washer only lightly compressed — an over-tightened washer splits and lets water through.

On cold roofs without thermal insulation — canopies, garages, agricultural halls — where moisture condenses on the underside of the sheet at night. The fleece is bonded to the underside at the works, takes up the condensate and releases it again during the day; it comes as an extra with the T-18, T-22, T-35, T-45 profiles.