Flat roof surveys and leak tracing across Torfaen

Guide price

£140–£280

Repair price

Confirmed once the leak or damage is found

Condition survey report

£140–£280

Coverage

England, Wales, Scotland, NI

How much does a flat roof survey cost in Torfaen?

Guide prices including VAT at Wales rates. We confirm the price once we've traced the leak or seen the damage.

Which flat roofs are common in Torfaen?

Flat roofs in Torfaen sit on lock-up garage blocks on estates, terraced streets with flat-roofed rear kitchens and bathrooms and low-rise post-war blocks of flats. Wales averages roughly 1,460 mm of rain a year, among the wettest in Britain, so we design for steady run-off: proper falls, clear outlets and upstands well above the finished roof. Approximate 1991–2020 regional averages based on Met Office data.

Building regulations in Wales

Welsh guidance is that most re-roofing needs building control approval, so it's worth checking whenever more than a quarter of a roof is replaced or repaired. Renovated roofs are upgraded to around 0.16 W/m²K where feasible, and new extension roofs are built to 0.13 W/m²K under the Welsh Approved Document L. In Torfaen the application goes to Torfaen County Borough Council. More on the rules.

What does a flat roof survey report cover?

The report sets out what the roof is, what condition it is in and what we recommend, in plain language.

• The roof system, approximate area and how the roof is built, as far as can be seen.
• The condition of the covering: splits, blisters, crazing, lost chippings, open laps and wear.
• Upstands, flashings, edge trims and rooflights.
• Falls, ponding and the state of outlets and gutters.
• Moisture readings and the findings of any core samples.
• The likely cause of any leak, and how confident we are in it.
• Recommended action, ranked by urgency, with guide costs.

We are clear about what we could and couldn't see. A survey can't inspect hidden timbers without opening them up, and we will say where a finding is an inference rather than a direct observation.

How do you find where a flat roof is leaking?

By working from the evidence inside back to the likely entry points outside, then confirming the path with moisture readings and, where needed, small test openings.

We start indoors, looking at where the staining is, when it appears and whether it follows rain, wind from one direction or cold weather. Then, on the roof, we check the details where most leaks start: upstands and flashings, laps and seams, outlets, gutters, edge trims, rooflight kerbs and anything that passes through the covering. Walls, copings and cavity trays above the roof are checked too, because water getting in behind an upstand can look like a roof leak.

A moisture meter shows where the covering, or the material beneath it, is holding water, and readings across the roof help map how far the wet has spread. Meter readings are a guide, not proof, so where they suggest a problem we may take a core sample: a small cut through the covering and insulation to see what is underneath and whether the deck is sound. The opening is sealed again with compatible material before we leave.

Condensation can also look like a leak, especially in older cold roofs without adequate ventilation, and the survey considers that possibility too. The flat roof leaks guide explains the common causes.

Which towns in Torfaen do we cover?

• Cwmbran
• Pontypool

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