window sill repair – Joinery Shop

Curved Bay Repair near Gerrards Cross: Part 2

robert beesley — Sat, 22 Nov 2025 09:55:27 +0000

With a plan in place, we started with the sill repairs.

We employed the use of a trammel arm and templates to match the curves and make the replacement section of sill from Accoya.

Once again, we were grateful to the folks at Mafell for offering a solution before we realised we even had a problem. We made use of their auxiliary fence for the LO65 router to give us the micro adjustment and offsets we needed to make everything accurately and repeatably.

There were of course still plenty of areas in which a good-old-fashioned razor sharp chisel and a practiced hand were the only way round the problem.

There were other times when offcuts of ply were the answer!

Window Sill Patch Repair in Maidenhead

robert beesley — Sun, 08 Dec 2024 11:29:19 +0000

Whilst these bay windows were being redecorated, the painter found a small but deep patch of rot in the sill. Too deep to fill and with the potential to cause future structural problems for the bay, we were asked to replace the corner of the sill.

This type of repair has two tricky areas. The first is getting the initial cut into the sill perfectly square so that the replacement section can join flawlessly with the existing sill. In this case, we needed to make two perfect cuts either side of the corner.

The second fiddly bit is getting the miter in the corner right as they aren’t necessarily a perfect 45 degrees.

This repair had a final challenge in the shape of an iron foot and plate under the corner post, which was installed when the bay was originally fitted. We needed to shape the sill around the post and foot whilst getting has much of the sill under the bay as possible to support the structure above.

With the replacement sections in place, all that was needed was a careful paring down of the new Accoya repair to perfectly match the original profile and mouldings and lastly, a coat of long life primer, ready for the decorator to continue with their work.

Sash Sill replacement in Cookham

robert beesley — Sat, 01 Jun 2024 13:36:09 +0000

This sash sill had been the victim of a previous repair which used an off-the-shelf tropical hardwood sill, a steel weather bar, mastic, resin-based cement and a bucket of filler to bridge the gap between the repair and the remaining part of the original oak sill.

Before the repair began, we took careful measurements of the original parts of the sash window’s pulley stiles and beading. We then made a complete replacement sill in Accoya wood.

The old repair came out easily, after which we were able to carefully separate what was left of the original sill from the pulley boxes. We could then slot in the new Accoya sill, joining it into the stiles as-per the original. We made-good between the repair and the building’s fabric using materials sensitive to those used when it was first built. Lastly, we made sure the sashes were opening and closing perfectly before fitting new draft-excluding beading, restoring the window to full working order.

Wooden Window Repair in Maidenhead

Colin — Sat, 12 Mar 2022 15:32:35 +0000

This dormer window on a listed building in Maidenhead was only 20 years old and was completely rotten .The whole of the sill needed replacing as well as both jambs and both barge board all in Accoya.

Time 3 days

Window Sill repair Beaconfield

Colin — Sat, 12 Mar 2022 15:27:02 +0000

These windows were only 12 years old and all the stick on glazing bars were rotten at the back of the property .I replaced them with new Accoya glazing bars along with MS bead sealing the window glazing beads. A few window patch repairs were required in the corners to get everything back to looking new again .