East Molesey · Case study

Rotten Window Sill Repair in East Molesey

Bay window sill in East Molesey after repair, finished in black gloss with white frames
Bay window sill in East Molesey after repair, finished in black gloss with white frames.

Saving a rotten bay window sill in East Molesey

From the path, this bay window looked fine. The black gloss on the sill was still shiny. But underneath, water had been getting in for years, and the timber had gone soft right through. In places you could pull it away by hand.

The usual answer is a new window. We repaired it instead, at a fraction of the cost, and kept the original leaded window.

What we found

Rotten timber exposed deep inside the window sill joint
Before: once the paint came off, the rot went deep into the joint.
Rotten window sill top hidden under black gloss paint
Before: the gloss on the outer edge was hiding soft, rotten timber behind it.
Corner of the bay window sill rotted away
Before: the corner of the sill had rotted and split away.
Front edge of the window sill rotted through
Before: the front edge, soft right through.

What we did

  • Cut out every bit of rot. Soft timber was removed back to sound wood, so nothing rotten was left behind to spread.
  • Spliced in new timber. New sections were fitted to the front of the sill and the bottom of the frame where too much had been lost to fill.
  • Rebuilt the corner in resin. The badly damaged corner was supported and rebuilt with a two-part resin repair, then shaped back to the sill's original profile.
  • Sanded and primed. The whole sill was sanded smooth so the repairs disappear under the paint.
  • Painted. The sill was finished in black gloss to match, with the frames cut in crisp and clean in white.
New timber fitted along the front of the window sill
During: new timber fitted along the front of the sill.
New timber spliced into the bottom of the window frame
During: new timber spliced into the base of the frame.
Rotten sill corner cut back and supported, ready for repair
During: the corner cut back and supported, ready to rebuild.
Window sill corner rebuilt with resin
During: the corner rebuilt in resin, ready to shape.
Full bay window sill repaired with new timber and resin, ready for painting
During: the whole sill repaired and ready for paint.

The result

A solid sill, sealed against the weather, and a window that looks as good as the day it went in. No one walking past would know how close it came to being replaced.

Window sill finished in black gloss beneath white window frames
After: finished in black gloss, with clean lines against the white frames.
Full length of the repaired bay window sill after painting
After: the full length of the bay, finished.
All projects

Soft or flaking window sills?

Rot caught early can almost always be repaired rather than replaced. We'll take a look and tell you honestly.

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