Flat Roof Repairs specialists in Cosham. Coastal specification, 10-year guarantee, free written quotes with no call-out fee.
Common flat roof repair calls from Cosham include blistering on aged felt systems, perimeter seal failure, and split membranes from storm damage. Portsea Island coastal microclimate accelerates felt degradation here compared to inland.
Localised repairs are viable where the membrane is otherwise sound and within its design life. Multiple failures or deck rot indicate replacement is needed. We assess deck condition as part of every survey.
A sound membrane with one localised failure is a repair. Multiple failures or over 15 years old in Portsea Island coastal microclimate conditions indicates assessment for replacement. We give an honest recommendation on survey.
| Service | Cost | Notes |
|---|---|---|
| Blister repair per blister | 150-300 | Patch and seal |
| Perimeter seal replacement | 200-500 | Full or section |
| Split membrane repair | 250-500 | Emergency or planned |
| Upstand repair | 150-350 | Per upstand |
| Deck assessment | Included | Part of any repair survey |
"Flat roof on our 1970s rear extension — GRP in a day. Matched the upstand height to the existing brickwork exactly."
"1930s chimney repointing — Portsmouth Roofing used lime mortar, explained why OPC cement would cause spalling. Correct decision."
"Fascia replacement on our 1930s semi — the 1980s UPVC had finally given up. New run fitted with correctly calculated fall angles."
Yes where surrounding membrane is sound. We assess the cause and repair correctly to prevent recurrence.
If localised and membrane is sound repair is appropriate. Multiple failures or aged membrane indicates replacement. Free survey.
Yes storm-split membranes attended 24/7. Call 0239 307 1334.
Yes deck condition is assessed as part of every repair survey. Hidden rot is identified and quoted upfront.
A properly carried out repair on a sound membrane should last until end of membrane life. GRP repairs are effectively permanent.
Yes we repair all flat roof system types including GRP EPDM and felt-based systems.
Yes free survey and written quote. No call-out fee. Call 0239 307 1334.
Cosham sits at the northern approach to Portsea Island — slightly inland from the harbour but within the island's salt-influenced microclimate. Frost incidence is similar to Portsmouth generally but the 1930s semi concentration creates a specific repair profile across the suburb.
Cosham and adjacent Drayton are dominated by 1930s semi-detached properties — original concrete plain tiles now 85 to 90 years old and showing advanced surface aggregate erosion. Many properties are at or past the repair vs replace decision point.
Cosham 1930s rear extension flat roofs are frequently on their third or fourth overlay. At this stage of accumulation, full strip and structural deck assessment is the correct starting point for any flat roof work. Every job we carry out in Cosham is specified for these specific conditions — not a generic Portsmouth-wide approach.
No call-out fees. No obligation. Flat Roof Repairs specialists in Cosham.
0239 307 1334