Cracked Render? We'll Repair It Properly Before Water Gets In in Dudley

Render is the weatherproof skin of your home, and it works hard. Through West Midlands winters it takes driving rain, frost and big temperature swings, so it is no surprise that it eventually cracks. The good news is that most render cracks are genuinely repairable — but the repair only lasts if the reason for the crack is understood and dealt with. This page explains what causes render to crack, how we assess and repair it, and what you can realistically expect from the result.

Why render cracks

Shrinkage is the commonest cause. Render dries and contracts, especially when applied too richly, too thickly or in hot weather, producing a map of shallow hairline cracks that don't follow any pattern. Impact damage from ladders, lawnmowers and children's games puts small cracks and dents in vulnerable spots. Movement in the building itself — everything flexing slightly between summer and winter — opens cracks at corners and around openings, particularly where render is applied right up against window frames without a movement joint. Water is the great accelerator: once a crack admits moisture, frost expands it and the area grows season by season.

A crack that runs diagonally, steps through the wall behind, or keeps growing is different — it suggests the structure beneath is moving, and that needs the structural assessment described elsewhere on our site before any cosmetic repair is attempted.

How we assess the damage

We look at the whole elevation, not just the obvious crack. We tap or probe the render around the crack to find hollow, drummy areas that mean the render has lost its grip, and we check for damp staining, moss or algae that show water has been getting in. We identify the render type — traditional sand and cement, lime-based, or a modern polymer system — because the repair material has to be compatible, or the patch will fail at its edges within a season or two. We also check the causes at the same time: leaking gutters, cracked sills, a hard surface sloping water at the wall, or a downpipe that soaks one corner every winter.

How we repair it

Hairline cracks are raked out, cleaned and filled with a flexible filler or fine repair mortar, then finished to match. Larger areas are cut back to sound render with clean square edges, reinstated in layers to the correct thickness, and finished to match the existing texture — smooth, scraped or textured. Where a patch would be visible however carefully it is matched, we discuss the options honestly: accept a visible repair, or render and refinish the whole elevation for a uniform result. Around openings and along long runs we check that movement joints exist and are doing their job; adding or sealing them is often what stops the same crack returning.

Any damp or gutter problems that caused the crack are repaired first, or the patch will not last.

Limits and honest expectations

Render repairs are matched as closely as the materials allow, but a new patch can look slightly different from weathered old render — we say so in advance rather than promise invisibility. Repaired render can crack again along old lines if the building moves, and we cannot guarantee against future cracking. Work is scheduled for dry, frost-free weather; render repair in unsuitable conditions fails early, so we would rather move the date than rush it.

Aftercare

Keep gutters and downpipes working so water doesn't repeatedly soak one patch. Avoid pressure-washing repaired areas, and inspect the render each spring for new cracks so small ones can be sealed before frost opens them up.

Booking your repair

Book through maintenance-men.com or by phone. You pay a booking fee when you book, and labour is charged hourly at a rate that depends on how soon you need the visit. The full cost is quoted and approved before work starts, with parts and materials quoted separately. Larger re-rendering projects are quoted after survey. Send photos of the crack when you book — they help us plan the visit.