Choosing a Flat Roof System for an Extension
Choose the full roof build-up, not only the waterproof finish. Structure, warm-roof insulation, drainage, upstands and rooflights shape the decision.
Choose the full roof build-up, not only the waterproof finish. Structure, warm-roof insulation, drainage, upstands and rooflights shape the decision.
Start with the roof design
The deck, falls and outlet positions should be set before choosing a membrane name.
Plan insulation and edge heights
A warm roof adds depth above the deck. Door thresholds, wall flashings and rooflights must allow enough upstand.
Count the difficult details
Lanterns, vents, soil pipes and several corners add more work than a simple rectangle.
Compare complete specifications
Ask each contractor to price the same deck, insulation, membrane, trims, outlets and internal boundaries.
Questions about this topic
Can roof photographs answer every question about extension flat roofs?
No. Clear photographs help, but hidden underlay, fixings, deck and water routes may still need close inspection.
Should I inspect extension flat roofs by climbing onto the roof?
No. Roof work is dangerous even when the check seems quick. Photograph extension flat roofs from ground level or a safe window and leave close access to trained people with the right equipment.
When should I request a written quote for extension flat roofs?
Ask for a written quote after extension flat roofs and the access needs have been assessed. It should set out the work, materials, exclusions and any likely extras.