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- Product Code: KOM-2171-1045
- Package Type: Packet
- Shopping Category: Hardware > Building Materials > Window Hardware > Window Frames
Replacement Joint Cover for 150mm Window Cills
(Choice of colour and pack size)
Easier fitting to existing window cills!
Tough plastic cover trims for replacing damaged or missing joints strips on 150mm uPVC window cills. Wider for better coverage over straight, 90° and 135° joints, and without vertical moulding, for easier fitting to existing windows.
Manufactured by Kommerling for their own, and Synseals, 150mm window and door cill, and compatible with many other profiles. These hard-wearing cover trims prevent ingress of water, bugs, and debris, whilst the UV-stable smooth white, and grained vacuum foiled colour finishes, keep them looking great year after year.
Features & Benefits
- Wider for improved joint coverage
- Easier fit over existing joints
- Authentic embossed grain effect
- Suitable for 150mm window cills
- Long-lasting durability and UV stable
What you can buy in this listing
Inline Joint

Also known as straight and 180° joints, these connectors are used to join two cills that run in line.

90° Joint

Covers and protects the cill joint of a 90° corner on square bay windows, and Georgian conservatories.

135° Joint

Designed for the joints on 5-segment bay windows, and the corners on Victorian conservatories.

These cill joint covers are available singularly, or in pack sizes of 2, 4 and 10 corner joint trims.
Technical Information
Measurement | Value |
---|---|
Material | uPVC |
Colours | White (RAL 9016)*, White Ash (RAL 9010), Anthracite Grey (RAL 7016), Rosewood (RENOLIT 3.3202 011) |
Application | Covering inline, 90° and 135° cill joints. |
Compatibility | Made for Kommerling and Synseal 150mm window/door cill, and suitable for many others. |
Pack Size | Single, 2 Pack, 4 Pack, and 10 Pack. |
* White is a smooth, non-grained finish.
How to fit cover trims to existing cills
When fitting to a window cill that exists in place, it may be necessary to remove debris, old adhesive, and clean the ends of the adjoining boards. Doing this will provide a neater job and a more long-lasting joint cover.
- If the cill has been cut with a hand saw, smooth and square the edges with fine grade sand paper.
- Clean the joint and cill with Solvent Cleaner and a clean dry cloth.
- Apply medium viscosity Superglue to the joint.
- Apply superglue accelerator to the cill.
- Then quickly put the 2 parts together concentrating on getting the front flush with the front of the cill then hold in place for 5-10 seconds.
- Silicone the back edge to seal where the joint meets the wall/window frame.