Sagging Flat Roof — what's actually going on

Common causes

• Soft or delaminated deck under the covering
• Firrings rotted where rainwater has tracked in
• Outlet set above the lowest point of the fall
• Original build laid without proper falls at all

How we fix it

• Lift a section to inspect the deck and insulation honestly
• Re-board and re-fir to restore the fall to the outlet
• Rebuild as a warm-roof EPDM or GRP system to current regs
• Integrate gutter aprons so run-off clears the wall

Sagging Flat Roof by area

Locally specific notes for sagging flat roof across the towns and neighbourhoods we cover.