Flat Roof Specialists in Bicester, Thame & Oxford

When You Need Flat Roof Work

The most common flat roof problems we see:

Pooled water

Water sitting on the roof rather than running off means the falls are wrong, or the roof has sagged, or the drainage point is blocked. Standing water finds its way in eventually.

Visible bubbling, cracking, or tearing

Felt roofs in particular fail at the surface long before the substrate gives up. Once the membrane is compromised, water tracks under it and into the timber below.

Damp internally directly below the roof

Damp on the ceiling of a ground-floor extension or in a garage is almost always the flat roof above. Trace it back to the source rather than treating the symptom.

Worn upstands and edges

Flat roofs fail at the joints first. The upstand against the house wall, the edges at the fascia, the seams around any pipes or vents. Visible cracking or lifting at these points is a leak in waiting.

Aged felt roofs

Traditional bitumen felt has a working life of around fifteen years. After that you're on borrowed time. Replacement before failure is cheaper than dealing with the damage after.

New extensions and garages

New build flat roofs need installing right first time. The cost difference between a properly built flat roof and a botched one is small. The cost difference five years later is enormous.

 Inspection and assessment

For repairs, we identify where water is actually getting in (often not where it shows up inside). For replacements, we check the deck condition underneath. For new builds, we work to drawings and Building Regulations. Free written quote within 48 hours.

Strip and prepare

Old roof comes off, deck is inspected, any rotten timber is replaced, falls are confirmed or corrected. This is the boring part and the part where most flat roofs go wrong.

 Install and detail

New membrane laid to manufacturer spec, with proper upstands, sealed seams, and trimmed edges. Outlets, hoppers, and downpipes connected. Lead flashing or proprietary detailing at the wall junctions. Cleaned and tested before we leave.

EPDM Rubber

Single-piece rubber membrane glued to the deck. Long lifespan (forty years plus), no visible seams on most domestic jobs, low maintenance. Currently our most-recommended system for new flat roofs.

GRP (Glass Reinforced Plastic)

Liquid laid in situ and cured to form a seamless waterproof shell. Strong, hard-wearing, walkable. Good for balcony surfaces and roofs that see regular foot traffic.

Torch-on Felt

Modern bitumen felt heat-sealed in layers. Cheaper than EPDM or GRP, shorter lifespan (fifteen to twenty years), still a sensible choice for budget-conscious replacements or for matching existing felt work.