Haverhill Roofers carries out roof repairs for homeowners in Cambridge, tracking down exactly where water is getting in and fixing it properly before the damage spreads.
Call any time. Calls are answered day and night and passed straight to our roofers.
Most roof problems give you warning signs long before a serious leak appears inside the house. Recognising them early is the difference between a straightforward repair and a much larger, costlier job. This page is about those warning signs, what causes them, and why they matter.
You do not need to climb onto a roof to spot the early indicators of a problem. A pair of binoculars and a slow walk around the property will reveal a great deal. Look for tiles or slates that are sitting at an angle rather than lying flat - a slipped tile will often leave a dark gap against the surrounding surface. Missing tiles leave an obvious void and expose the roofing felt beneath to UV and rain.
Ridgeline mortar is another area worth studying. The ridge is the capping along the very top of a pitched roof, and the mortar that beds each ridge tile in place dries out and cracks over time. Loose or missing ridge tiles are a genuine hazard - they can fall - as well as being a direct entry point for water.
Check the valleys too. These are the angled channels where two roof slopes meet. They carry a large volume of rainwater down to the gutters, so any crack in the lead or mortar there becomes a problem quickly.
Water stains on ceilings are the most obvious interior warning, but they are often misleading about where the actual entry point is. Water travels along rafters and roofing felt before it drops, so a stain above a bedroom may have come in through a gap a metre or more away. Damp patches on top-floor walls near the chimney breast frequently point to a failed chimney flashing rather than the tiles themselves.
A musty smell in the loft, even with no visible staining, can indicate that the felt underlay is absorbing moisture. This happens when a small number of tiles have slipped enough to let in wind-driven rain without producing a drip you would notice on the ceiling below.
Tiles and slates are fixed in place either by mortar or by a nail through a pre-drilled hole into the batten beneath. Nails corrode over decades - a common problem on roofs that are thirty or forty years old - and when they fail the tile can slide down under its own weight. A single slipped tile is rarely a sign of a wholesale roof failure; it is usually just the nails on that section giving out.
Thermal movement is a less obvious cause. Roofing materials expand in warmth and contract in cold. Over many years this cycling works mortar out of ridge and hip joints. The same movement stresses lead flashing, which is why flashings eventually crack or lift at the edges even when they were well installed to begin with.
Moss and lichen hold moisture against tile surfaces and work their roots under the edges of slates, gradually prising them loose. Clearing moss before it becomes established matters more than most homeowners realise.
Lead flashings seal the join between the roof covering and any vertical surface - chimney stacks, dormer walls, and the abutments where a lean-to or extension meets the main house. They are stepped into the mortar courses of brickwork and dressed down over the tiles. When the pointing in those stepped joints fails, or when the lead itself splits along a fold, the gap is invisible from ground level but lets in a surprising amount of water.
A chimney flashing repair on a typical house involves re-pointing the stepped joints, re-dressing the lead apron at the front of the stack, and checking the back gutter behind it. Done properly it is a half-day to full-day job for one or two roofers, not a five-minute patch with sealant.
Flat roofs - on extensions, bay windows and outbuildings - show their own set of warning signs. Blistering or bubbling on the felt surface means moisture has got between the layers, usually through a split or a failed edge detail. Ponding water (water that sits rather than draining away) accelerates felt deterioration significantly and points to a drainage or fall problem as well as a surface issue.
Felt flat roofs repaired with patches and lap sealant give only short-term results if the underlying felt is saturated or the deck boards beneath are soft. A proper repair means cutting out the failed section back to sound material, replacing any rotten deck, and laying new felt with correctly lapped and bonded joints. EPDM rubber is an increasingly popular replacement for tired felt on small flat roofs because it is laid in a single sheet with far fewer joints to fail.
The single most important part of any roof repair is finding where the water is actually entering, not just treating where it shows. Applying mortar or sealant to a visible gap while the real entry point is a metre away is one of the most common reasons a "repaired" roof continues to leak. A thorough inspection before any work starts should look at the tiles, the flashings, the ridge, the valleys, the verges and the gutters as a system, not in isolation.
If you notice any of the signs described on this page on your home in Cambridge or in nearby villages, it is worth arranging a roof survey before any work is quoted or started.
As well as Cambridge, we carry out roof repairs across the surrounding area. We also cover Withersfield, Sturmer, Stoke by Clare, Steeple Bumpstead, Ridgewell, Poslingford, Kedington, Great Sampford, Clare, Castle Camps and Ashen.
If you have seen any of the warning signs described above - slipped tiles, staining on ceilings, crumbling ridge mortar or damp near the chimney - do not leave it over winter. Call Haverhill Roofers to arrange a roof inspection in Cambridge and we will tell you exactly what needs doing and why.
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Call any time. Calls are answered day and night and passed straight to our roofers.
