Why timber fails here
Wooden windows are well made, often better made than what would replace them, and they can last generations. In Mumbai they usually do not, and the reason is consistent.
The paint or varnish film is what keeps water out of the wood. It breaks first at the vulnerable points: the bottom rail where water sits, the joints where the timber moves, and around fixings. Once moisture is behind the film, the coating works against you — it traps the water against the wood instead of letting it dry.
Add monsoon humidity, seasonal swelling and shrinking, and wood-boring insects, and the decay that follows is predictable.
What we repair
Rot
Decayed timber is cut back to sound material and new, matched timber is spliced in — a scarf joint on a rail, a let-in patch on a face. Filling over rot is not a repair. It hides the decay and traps moisture, and it fails in a season or two.
The other half of the job is finding what let the water in, because splicing a rail without fixing the failed joint above it means doing the same work again.
Open joints
Timber windows are mortise-and-tenon jointed and wedged. As the wood moves through the seasons, wedges loosen and glue lines fail, and the sash goes out of square. Re-wedging and re-gluing restores the geometry — and a square sash is the prerequisite for the window ever sealing again.
Insect damage
Wood-boring beetle shows as small round exit holes with powder beneath them. Termites show as mud tubing near the frame and timber that crumbles under a probe.
Both are treated before repair. Repairing around a live infestation is wasted work — it is the one part of the sequence that cannot be reordered.
Hardware
Old timber windows often have good-quality original ironmongery worth saving: it is cleaned, freed and re-hung rather than swapped for modern parts. Where something has to be replaced, we try to match the pattern. Sash-specific work is covered under shutter and sash repair.
The finish
Rebuilt as a system: preparation back to a sound substrate, primer, undercoat and topcoat specified for high UV and monsoon exposure. End grain is sealed properly, which is where most coating failures begin.
When replacement is the honest answer
We would rather repair timber joinery than replace it. But there is a point past which repair is not economic:
- rot through the joints rather than along a single member
- multiple members decayed on the same sash
- a frame that has moved permanently out of square
- repeated repairs where the underlying water path was never found
At that point, replacement with uPVC or aluminium — or with new timber, if the building warrants it — is the better spend. See window frame repair for how we assess which case you are in.
Keeping repaired timber repaired
Annual inspection of the coating, especially on the exposed elevation. Recoat before the film breaks, not after. Keep drainage at the sill clear. Deal with any small crack at a joint immediately — that is the entry point for everything that follows.
That is essentially the timber version of our maintenance service, and on timber it is the difference between a window that lasts another thirty years and one that needs replacing in five.