Cracked Sealant? We Find Why It Failed, Then Reseal in Dorridge

Why a seal cracks instead of peeling

A peeled bead has lost its grip; a cracked one has been worked too hard. Silicone in particular fails in cracks when it is stretched — across a joint that moves more than the bead was shaped for, or along a line where the house flexes seasonally. Other causes are just as common: the sealant was past its best when applied, it was put on in cold conditions, it was laid over a damp substrate so it cured badly from underneath, or a rigid filler was used where a flexible seal was needed. Each cause has a different fix, which is why we look before we reach for a cartridge.

Diagnosing before patching

The pattern of the crack tells us a lot. Fine splits along the length of a bead usually mean shrinkage or poor application. Cracks across the bead, at right angles to the joint, point to movement — the two surfaces are flexing apart and the bead is taking the strain. Cracking that repeats in the same spot on several joints on the same wall suggests something bigger is moving, such as a lintel or settlement, and deserves a closer look before any reseal, because a fresh bead in a moving joint will crack again. We check the joints either side, the substrate beneath and, on walls, anything above the joint that might be loading it.

Patch, or strip and redo

Where a bead has failed from age or shrinkage on a stable joint, a partial repair can work: the cracked section is cut back to sound material, the ends are feathered and the patch is blended in. Where the cracking is from movement, or the bead is old enough that patches will just chase the failure, the honest answer is a full strip and reseal with the right product and a bead profile suited to the joint's movement. We will tell you which we recommend and why, and the difference shows up in the quote before you commit.

Movement joints and where cracks will return

Some joints are always going to move: where a bath meets tiles that flex, where render meets a timber frame, where a long run of worktop sits over a warm floor. For those, the fix is not more silicone but the right geometry — correct bead depth, backing where needed, and a product with enough movement tolerance. We will also tell you if a crack looks structural rather than cosmetic: repeated cracking in a straight line across multiple rooms, or cracks that keep reopening wider, should be assessed by a builder or surveyor before anyone reseals them.

Aftercare that prevents the next crack

Once repaired, the bead needs its full curing time before it is flexed, wet or painted, so we leave you the product's instructions and any limits on use. To keep seals healthy afterwards, avoid aggressive cleaning directly on the bead, and expect movement joints — particularly outside, in full sun, or where big temperature swings happen — to age faster than sheltered indoor ones. If a specific joint cracks again within a short period, photograph it and call us back; a repeat failure is information about the joint, and we would rather investigate than re-patch on a loop.

Booking a cracked seal repair

Tell us where the cracks are — one joint or several, one room or spread through the house — and whether anything has changed recently, such as new tiling, new heating or building work nearby. Same-day visits may be available depending on the diary. The booking fee is paid when you book, the hourly labour rate depends on how soon the visit is needed, and the full cost of the agreed repair, including any sealant quoted separately, is confirmed with you before work begins.