Newport, Torfaen & Monmouthshire · NP44
Cwmbran's new town estates were built fast and finished in render and dash. Decades later, we repair the cracks, hollow patches and stained walls they have developed.
Cwmbran was designated a new town in 1949, and much of it was built over the following decades as neighbourhoods laid out around the town centre. That history shows on the outside of its houses. Large numbers of homes were finished in pebble dash or render when they were new, which means many of those finishes are now well past their first half-century and starting to show their age.
We repair pebble dash across Cwmbran, from single cracks above a back door to whole terraces that need re-dashing. Because so many homes were built to similar designs, problems tend to repeat: cracking at the corners of openings, dash coming away at the base of walls, and staining where gutters overflow. Knowing those patterns helps us diagnose quickly and quote clearly. We work for owner-occupiers, landlords and housing providers, and we always explain whether a repair, a clean or a fuller renewal is the better use of your money.
Most of Cwmbran's housing dates from the late 1940s onwards. Early neighbourhoods such as Pontnewydd and Fairwater were joined by Greenmeadow, Coed Eva, St Dials and others, many built by the development corporation in terraces and short blocks. Construction methods varied over the years, and some estates used non-traditional building systems alongside conventional brick and block. Pebble dash and render were common finishes because they were cheap, quick and hid plain blockwork.
The town sits in a valley between the Afon Lwyd and the ridge running up towards Mynydd Maen, so homes on the western slopes catch more wind and rain than those lower down. North-facing rows can stay damp for long spells in winter, which encourages algae and moss on the dash.
Render of this age often fails in a predictable way. Fine cracks form where the wall moves slightly around windows and doors, water gets in, and freeze–thaw gradually breaks the bond between the render and the block. Large areas then sound hollow when tapped, even if they still look fine. On some system-built homes, the condition of the structure behind the render also needs checking, so we survey carefully and will tell you if a specialist opinion is needed before we start.
Many Cwmbran enquiries come from owners of former council houses who want their home to look fresh without stripping the whole wall. When the render is mostly sound, patch repairs followed by painting with a suitable masonry coating can give a uniform finish. Where a terrace has failed widely, owners sometimes ask about a modern render system instead of new dash, and we can explain the options on our rendering over pebble dash page. Joined homes need care at the boundary with next door, and we discuss that with you at the survey.
Good to know
Yes. We repair individual houses in a terrace all the time. We finish the new dash to a clean line at the party boundary and take care not to disturb next door's render. If neighbours are also thinking about work, doing several homes together can make scaffolding and colour-matching more straightforward, so it is worth asking them.
Some homes in the town were built using non-standard construction systems. It matters because the render may be covering panels rather than brick or block. If we suspect this, we will say so and recommend you get the structure checked before any re-rendering, as some lenders and surveyors look closely at these houses.
Rain bouncing off paths and patios keeps the lowest part of the wall wet, and sometimes soil or paving has been raised above the damp-proof course. That area takes the worst of the frost. We cut back failed render, check the ground level and finish the repair so it does not bridge the damp-proof course.
Higher, more exposed houses take harder wind-driven rain, so we pay extra attention to sills, drips and the junctions where water collects. Access on sloping gardens can also need a stepped or adjustable scaffold, which we assess on site. We avoid applying render on windy, wet days, as fast drying or rain can spoil it.
We use a soft-wash method rather than a high-pressure jet, applying a suitable biocide that kills algae and moss and lets it break down. Blasting dash at high pressure can loosen stones and push water into cracks. Our pebble dash cleaning page explains the process in more detail.
Services
Every service below is available in Cwmbran and the surrounding area. Tap one for the full details.
Ring 07565 147 170 or fill in the form with a few details and, if you can, photos of the problem. When we arrive, we check every wall rather than just the obvious crack, tapping the render to map hollow sections and looking at sills, beads and the base of each elevation. You will see aggregate samples against your wall so you can judge the colour for yourself. We check where the scaffold or tower will stand, how vans can park on estate roads and any shared paths with neighbours. Start dates are planned around dry, mild weather. During the work we protect windows, doors and planting, and when we leave, debris and dust sheets go with us.
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Case studies
A painted 1930s semi with cracks running from the front window corners and a damp patch inside. We traced the cause, repaired the cracks and repainted the front elevation.
Typical job exampleRead the case study
A terraced house facing Swansea Bay with hollow render across most of the front. Patching would not have lasted, so we stripped and re-dashed the elevation to match neighbours.
Typical job exampleRead the case study
A post-war semi with several blown areas around pipes and below sills. We patched them using a blend of aggregates sampled to match the existing natural dash.
Typical job exampleRead the case studyFAQs
We look at the area involved, how much hollow render must be cut out, wall height and the scaffolding or access equipment needed. The chosen finish, whether painting or cleaning is included and the condition of sills and beads also affect it. Every quote is written and based on what we see on site.
We select aggregate that is close in size and tone and test it next to your wall, but long-weathered stones are hard to match perfectly. Often the neatest answer is to repair to a corner or other natural break, or to paint the wall afterwards so the whole elevation reads as one colour.
Yes. We carry out repairs on rented homes and can work to a schedule, liaise with tenants about access and provide clear written quotes. If you manage several properties in the town, we can survey them together and prioritise the walls that most urgently need attention.
It depends on how much of the render is still firmly bonded. If most of the wall sounds solid, repairs are sensible. If hollow areas are spread widely, patching tends to become a repeat cost and re-dashing is usually better value. We show you the hollow areas we find so you can see the reasoning.
Renewing render over a large proportion of a wall may trigger requirements to improve insulation under Building Regulations. The rules have exceptions and depend on the work, so we advise checking with building control at Torfaen Council or an approved inspector before larger jobs. Small repairs are generally less likely to be affected.
From the blog
Preparing for a Pebble Dash Job: Scaffolding, Neighbours and TimingA little planning makes any pebble dash job run more smoothly. Here is what to expect with scaffolding, neighbours, permissions and the weather.Read more 
Why Pebble Dash Cracks in Welsh WeatherRain blown in off the Atlantic, frost on the hills and salt on the coast all test pebble dash. Here is how weather causes cracking, and how to slow it down.Read more 
Can You Paint Pebble Dash? What to Know Before You StartPainting can transform tired pebble dash, but it is a long-term commitment. Here is what to consider, how to prepare and which coatings suit Welsh walls.Read more 
Repair, Re-Dash or Render? Choosing the Right Option for Your WallPatching, re-dashing and re-rendering all have their place. This guide explains when each makes sense, what they involve and the questions to ask before deciding.Read more 
Cleaning Pebble Dash Safely: Why Soft-Washing Beats the Jet WasherAlgae and moss love damp Welsh walls. Here is how to clean pebble dash without blasting the stones off, and how to slow down the green coming back.Read more 
How to Tell If Your Pebble Dash Needs RepairingA walk round the outside of your house can tell you a lot. Here are the simple checks that show whether pebble dash is sound or starting to fail.Read more Free survey and a clear written quote anywhere in South & West Wales.