Damp proofing in Eaglescliffe

Damp surveys, penetrating damp repairs, cavity investigations and condensation control across Eaglescliffe TS16, where interwar and 1950s semis with early cavity walls and later retrofitted insulation produce most of the local damp enquiries.

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Early cavity walls, and what goes wrong with them

Much of Eaglescliffe is 1930s and 1950s semi-detached housing built with a cavity, which is good news: rising damp is rare, because the damp proof courses of that era are usually still doing their job. The failure modes are different. Mortar dropped onto wall ties during construction bridges the cavity and carries water to the inner leaf, producing an isolated damp patch mid-wall with nothing visible outside. Wall ties themselves corrode and expand over time. And cavities get partially blocked at the base, so water that should drain away sits against the inner leaf instead.

Retrofitted insulation

A large proportion of these houses were filled under grant schemes. On a sheltered elevation the fill is usually harmless and helpful. On the exposed side of a house, particularly where the pointing was already tired, it can transmit water across the cavity. The signature is damp appearing across one whole elevation a year or two after installation, and the remedy is extraction of the fill plus masonry repair, ideally under any surviving scheme guarantee.

Trees, gutters and shade

The older roads here have mature trees. Leaf fall blocks gutters and gullies every autumn, and the resulting overflow soaks a wall repeatedly all winter. Shade from the same trees keeps that wall from drying. Two hours of gutter clearing in November prevents more damp in Eaglescliffe than any chemical treatment.

Condensation in improved houses

Where these semis have been re-glazed, filled and draught-proofed without upgrading ventilation, moisture has nowhere to go. Trickle vents, humidity-controlled extraction or a PIV unit restores the balance without undoing the energy improvements.

Prices in Eaglescliffe

Damp surveys £150 to £350. Cavity clearance and repair £250 to £700. Cavity fill extraction £1,500 to £4,000. Repointing £45 to £90 per square metre. Extractor fans £180 to £350, PIV £600 to £1,200.

Damp proofing services in Eaglescliffe

Frequently asked questions

There is a damp patch in the middle of my wall with nothing outside to explain it.

That pattern usually means a bridged cavity, often mortar sitting on a wall tie. A borescope inspection through a small hole confirms it without dismantling anything.

Could my cavity wall insulation be causing damp?

On an exposed elevation with tired pointing, yes. The tell is damp across a whole face of the house appearing after the fill was installed. Check the scheme guarantee before paying for extraction.

Why is the damp worse in autumn?

Blocked gutters and gullies from leaf fall, combined with shade that stops the wall drying. Clearing rainwater goods before winter is the cheapest damp measure there is.