The details that keep the water out.

Lap seam

Where two sheets meet. The joint is made with QuickSeam Splice Tape, cold, without flame or hot air.

• Overlap at least 100 mm.
• Tape 76 mm wide. 5–15 mm of tape must show past the edge of the upper sheet.
• Both surfaces cleaned and primed with QuickPrime and a QuickScrubber until an even dark grey, then left to flash off (usually under 10 minutes).
• Pressed down with a silicone hand roller along the full length.
• Where two rolls of tape meet: 25 mm overlap and a FormFlash patch on top.

Watch a seam being made

Upstand at a wall

The membrane turns up the wall and is held at both ends: at the base and at the top.

• Membrane bonded at least 150 mm above the finished roof.
• Fixed at the base with a perimeter strip, fixings no more than 300 mm apart and within 30 mm of the corner.
• At the top: a termination bar with fixings no more than 200 mm apart, Water Block behind it and sealant along the top.
• The bar is cut at every corner, with a gap of at least 5 mm.

Roof edge

Where the roof stops at a metal edge trim.

• Trim fixed no more than 100 mm apart.
• QuickSeam Flashing, 127 mm wide, runs over the trim flange and at least 50 mm onto the membrane.
• QuickSeam Flashing is only used on straight runs, never stretched round three-dimensional corners.

Pipe through the roof

Round pipes get a moulded EPDM pipe flashing, so there is no cutting and patching on site.

• Pipe Flashing fits pipes from Ø 25 to 152 mm. Smaller conduits from Ø 13 to 64 mm get a Conduit Flashing.
• Stainless clamp at the top, Lap Sealant around the flange edge.
• Odd shapes and groups of pipes get a Penetration Pocket filled with Pourable Sealer.

Roof drain

The outlet is where all the water goes, so it is sealed twice: under and over the membrane.

• Water Block in a continuous bead on the drain flange.
• Membrane runs about 20 mm into the bowl.
• Clamping ring bolted down over the membrane.

T-joint

Where three sheets meet, the step in the seam is covered with a patch.

• FormFlash patch about 150 mm across, 75 mm each way from the joint.
• Lap Sealant on the cut edge of the patch.

Fixing in the seam

One of the mechanical options: a batten fixed down inside the lap.

• Overlap at least 200 mm.
• Wide tape: 152 mm.
• The number and spacing of fixings come from the wind load calculation.

Mechanically attached system

Walkway pads

Rubber pads where people walk: to plant, to vents, to solar panels.

• Pads 762 × 762 mm.
• Gaps of 25–150 mm between pads so water can drain.
• If a pad would sit on a seam, a cover strip goes on first, running at least 150 mm past the pad.

Roof for solar panels