DAMP GUYDAMP SPECIALIST · CUMBRIAFree survey
DAMP GUYDAMP SPECIALIST · CUMBRIA

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TOUGH ON DAMP.

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SIGNS, CAUSES & REPAIRS

PENETRATING DAMP
IN CUMBRIAN HOMES.

A patch that darkens after every downpour, a damp chimney breast or a stain creeping around a window? Here’s how rainwater gets in, and how to keep it out.

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Written and reviewed by Damp Guy, damp and plastering specialists in Cumbria for 8 years ·

How to spot
penetrating damp.

Cumbria gets some of the wettest weather in England, and wind-driven rain off the coast and the fells tests every wall, roof and window. When water finds a way in, it usually leaves clues that change with the weather.

Patches that change with the weather

Damp areas that darken or spread after rain and fade in dry spells are a strong sign that water is coming from outside. They can be anywhere on a wall, not just near the floor.

Chimney breasts, ceilings & windows

Stains on a chimney breast, a ceiling below the roof or around window frames often point to flashing, roofing, chimney or seal problems above or around them.

Spoiled plaster & mould

Repeated wetting can blow plaster, lift paint and wallpaper, rot timber and encourage mould on the damp surface.

Further reading +

Where is the
water getting in?

Common routes in

  1. Blocked, cracked or leaking gutters and downpipes
  2. Worn or cracked pointing between stones or bricks
  3. Cracked or hollow render that holds water against the wall
  4. Chimney flashing, pots or stacks letting water in
  5. Failed window seals, sills or frames
  6. Slipped slates or damaged roof details
  7. Ground or paths built up against the outside wall

What you can check today

  • Watch the gutters in heavy rain: are they overflowing or dripping?
  • Look for damp staining on the outside wall behind the damp patch inside.
  • Check the pointing, render and window sills on the side that faces the weather.
  • Note whether the patch changes after rain and take dated photos.
  • Avoid sealing a stone wall with a waterproof coating without advice, as it can trap moisture.

How we
fix it.

Trace the route

We look inside and out, at the weather side of the building, gutters, pointing, render, chimney and openings, to work out where the water is getting in.

Repair the cause

The fix depends on the route: clearing or repairing rainwater goods, repointing or render repairs, or putting right details around openings. Traditional stone walls need breathable materials.

Dry out & make good

Once the water is kept out, damaged plaster is repaired with a suitable finish, and we agree when it’s safe to decorate.

Penetrating damp help
across north & west Cumbria.

Send your postcode to confirm availability, including nearby towns and villages.

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Carlisle & the north

Carlisle, Brampton, Longtown, Wigton

West Cumbria & the coast

Whitehaven, Workington, Maryport, Silloth, Aspatria, Egremont, Cleator Moor

Penrith & the northern Lakes

Penrith, Keswick, Cockermouth

Penetrating damp
FAQs.

What’s the difference between penetrating damp and rising damp?

Penetrating damp is water coming in through the walls, roof or openings, so it can appear at any height and changes with the weather. Rising damp comes up from the ground and only affects walls at ground-floor level. The fix for each is different, which is why the cause matters.

Can penetrating damp affect upstairs rooms?

Yes. Because it comes from rain rather than the ground, it often shows on upstairs walls, ceilings below the roof and around windows and chimneys.

Will a water-repellent cream stop it?

Masonry water repellents can help some brick walls in the right conditions, but they don’t repair the route water is taking and aren’t suitable for every wall, especially traditional stone that needs to breathe. Get the cause checked first.

Can penetrating damp cause mould?

It can. Damp surfaces stay cold and wet, which is where mould grows. Treating the mould without stopping the water usually means it comes back.

How long does a wall take to dry once it’s fixed?

Thick stone walls can take months to dry fully, depending on how wet they were and the weather. We’ll talk you through drying and decorating for your home.

Do you do the outside repairs as well?

We’ll diagnose the cause and explain what needs doing. Contact us with the details and we’ll discuss the repairs and the inside making good.

HOW WE CAN HELP

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