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Damp proofing in Dover? Get an independent survey first
"Damp experts Dover" and "damp proofing Dover" are common searches, and most of the walls behind them are chalk block, flint or Victorian brick on slopes. We are independent surveyors and we sell no treatment, so we can tell you plainly whether damp proofing is the answer.
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Why the survey comes before damp proofing in Dover
A free damp survey in Dover is usually a sales visit with a meter. The meter reads high on a wall that is wet for any reason, and on salts in old plaster even when the wall is dry, so a high reading proves very little. An independent survey finds the cause, and only the cause tells you whether damp proofing is the remedy at all.
The Dover quotes that concern us most are injection and cement replastering on chalk block and flint walls, and injection on uphill walls that are wet from the slope behind. On chalk block, cement replastering accelerates decay. On retaining walls, injection does nothing for water arriving sideways.
A short guide to damp proofing methods
Chemical injection puts a water repellent barrier into the base of a wall. Electro osmotic and other proprietary systems make similar claims by different means. Membranes and tanking hold or drain water on below ground walls. Breathable or salt resistant plasters deal with what years of damp leave behind. They are tools, and the skill is in knowing which, if any, the wall needs.
Old Dover walls built in flint, chalk block and brick or soft brick were never meant to be sealed. They take a little water and lose it again, and many damp problems in them start the day somebody stopped them losing it. The right damp proofing for such a wall is often the work that lets it breathe again.
Dover walls, and what they actually need
Chalk block and flint need lime render, lime pointing and breathable finishes. Victorian terraces on slopes need drainage on the uphill side and below ground solutions where rooms sit below ground. Seafront walls need sound render and salt tolerant plaster.
The Dour rises at Temple Ewell and River and runs through the valley floor to the harbour, partly culverted in town. The valley floor has river deposits and a higher water table; the slopes are chalk. Whitfield, on the plateau above, has much newer housing on well drained ground. The famous cliffs east and west of the harbour are a visible reminder of what everything here is built on.
- Removing cement render from chalk block and replacing with lime
- Lime repointing on flint walls
- Intercepting surface water uphill of houses on the valley sides
- Salt tolerant plaster on exposed seafront walls
Why chalk and flint walls are often harmed by damp proofing
Chalk block is weak when wet and strong when dry. Flint walls rely on lime mortar to stay sound. Both depend on being able to lose water as fast as they take it in. Most damp proofing systems do the opposite: they add a barrier and a dense, waterproof plaster that stop the wall drying on the inside face.
On a chalk block wall that has already been rendered in cement outside, adding a waterproof plaster inside traps the wall between two impermeable skins. Moisture builds up, salts crystallise and the block softens. We have seen walls where the face of the chalk had turned to paste behind the plaster. The repair after that is far more expensive than the treatment was.
The proportionate approach is lime render and lime plaster, ground kept low, rain kept out, and the wall allowed to dry. Where a wall is below ground on the uphill side, drainage and a drained membrane are the answer. The survey establishes which applies before any money is spent.
What proper damp proofing should look like
- A written diagnosis first, with readings and photographs, saying why the wall is wet
- External causes fixed before or alongside any internal work: ground levels, gutters, pointing, render
- A damp proof course only where one is missing or has genuinely failed, at the right height for the Dover house in question
- Salt contaminated plaster removed and replaced with a suitable breathable or salt resistant finish, not sealed over
- Drying time allowed before decoration, because a wall that has been wet for years does not dry in a week
- A guarantee that names the walls treated and the cause addressed, from a firm that will still be there
Red flags in a damp proofing quote
- A diagnosis of rising damp from a single meter reading
- No mention of anything outside the house
- Injection recommended on internal walls, chimney breasts or walls above ground floor
- A discount that expires today
- Treatment of woodworm or rot in every timber "as a precaution"
- A quote for a Dover period house that would be identical for a 1990s semi
When a damp proof course is the right answer
There are walls in Dover that do need a damp proof course. A solid wall built without one, or with a slate or bitumen course that has cracked or been cut through, that is wet at low level with nothing outside to explain it and with the readings falling off with height, is a reasonable candidate. When we find that, the report says so and specifies where and how high, so you can get comparable quotes.
Our survey fees are published on the prices page and fixed before we visit. Set against a damp proofing job on a Dover house, which typically runs to several times that once plaster removal and making good are included, the survey is small. When it shows that a wall needs a gutter repair rather than an injected course, it pays for itself several times over.
Dover has some of the most affordable housing in Kent, much of it Victorian terraces on slopes and older flint cottages in the villages. Homebuyer reports often recommend damp specialists. An independent survey before exchange separates lateral water, cement damage and salt from genuine defects, and gives you a realistic cost.
After the survey you have the cause in writing, a list of what needs doing in order, and what does not. If damp proofing is part of it, the report specifies the walls, the height and the finish, so the quotes you collect in Dover are for the same job. If it is not, you have the evidence to say no to the quote you were given.
For the full picture of what a survey here involves, see damp surveys in Dover.
Around Dover
The seafront and town centre
Older buildings and flats exposed to the Channel. Render, salt and wind driven rain dominate, with flats raising freeholder questions.
Tower Hamlets, Maxton and Buckland
Victorian terraces on the valley sides. Lateral damp on uphill walls, yards and drainage are the usual causes.
River, Temple Ewell and Whitfield
Village cores with flint and chalk building, and newer estates on the plateau. Lime repairs in the villages; ventilation and condensation in newer homes.
What customers say on Google
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Damp proofing questions in Dover
Can chalk block walls be damp proofed?
They can be kept dry, but not with the usual damp proofing. Chalk block needs lime render outside, lime plaster inside and ground kept low. Injection and waterproof plaster trap moisture in a soft material that weakens when wet, and we have seen walls badly damaged by it.
Does a wall cut into the valley side need a damp proof course?
No. It is retaining ground and is wet from the side. It needs water intercepted uphill of the house and, if a room sits below ground, a below ground system. A horizontal course does nothing for lateral water.
Is salt damp on our seafront wall a reason for damp proofing?
No. Salt from spray draws moisture out of the air into the plaster. Replacing contaminated plaster with a salt tolerant finish and keeping rain out of the wall helps; an injected course does not.
What should a Dover damp proofing quote include?
The cause in writing, which walls and how high, the plaster specification and why it suits the wall, any outside work to be done first, the drying time before decoration, and exactly what the guarantee covers. If those are missing, ask before you sign.
Our Whitfield new build has mould. Is damp proofing needed?
Almost certainly not. Mould in a modern house is condensation, ventilation or a construction detail. The survey measures extraction and humidity, and the report can go to the developer if it is a defect.
Do you carry out work?
No. We survey and report only, which is why the report can tell you when damp proofing is not needed.
Do you carry out damp proofing in Dover?
No. We survey and report only, and we take no commission from contractors. That is what lets the report say a wall does not need damp proofing when it does not. Where it does, the specification is written for you to get like for like quotes.
Nearby
Book a survey before you pay for damp proofing
Get the cause in writing before anyone drills a wall. We sell no treatment and cover Dover and the villages around it.
Book a Survey or call 07386 225526