Detail explorer

Detail 01

Parapet

Membrane upstand and linear perimeter fixing at the parapet — where wind suction and mechanical loads are highest.

System variants

• Protan SE + Secret Fix pocket
• Protan SE + PVC-laminated metal
• Protan G (ballasted) + linear fixing

Common errors

• No linear fixing at the internal angle
• VCL interrupted under the parapet
• Upstand too low
• Coping without fall to the roof

Detail 02

Roof outlet

Water collection point with a membrane connection. Placed at the low point with a sump around it.

System variants

• Vertical outlet through the deck
• Horizontal outlet through the parapet (overflow)
• Heated outlet

Common errors

• Outlet not at the low point
• No sump
• No emergency overflow
• Uninsulated outlet body — condensation

Detail 03

Pipe penetration

Round penetrations (vents, flues, stacks) are sealed with preformed PVC pipe collars.

Common errors

• Site-cut collar without weld check
• No top clamp
• VCL not sealed to pipe

Detail 04

Cable penetration

Cables (solar PV, lighting, lightning protection) pass through cable entries, not through the membrane.

Common errors

• Cable pushed through a slit and sealed with mastic
• No drip loop
• Cables abrading the membrane

Detail 05

Expansion joint

At a structural movement joint the roof must accommodate movement without stressing the membrane.

Common errors

• Membrane stretched across the joint
• VCL not covering compensator edges
• Joint at a low point — ponding

Detail 06

Rooflight upstand

Membrane upstand to a rooflight or smoke vent kerb — like a parapet, on all four sides.

Common errors

• Kerb too low
• Corners without preformed parts
• VCL interrupted at the kerb

Detail 07

Wall abutment

Roof-to-wall junction: membrane upstand, linear fixing and protection against water running behind the membrane.

Common errors

• Top not covered — water runs behind the membrane
• No linear fixing at the angle
• Wall cladding without clearance from the roof