Sash Window Cill Timber - 1.5m / 1500mm / 5ft

Sash window cill timber, machined to a traditional profile, provides a solid base and effective rainwater drainage for single-glazed sash windows. This 2.4m length suits repair work and full replacements in period properties and listed buildings where matching original details matters.

Specifications

What it's used for

• Replacing worn or rotted cills on traditional timber sash windows in period and listed properties
• New sash window installations where a machined cill is required to match existing joinery profiles
• Renovation projects in conservation areas where retaining original window character is a planning requirement
• Integration with other sash window parts such as staff beads, parting beads, and linings for a complete refurbishment

Fitting and handling

Allow the cill to acclimatise inside the property for at least 48 hours before fitting, particularly in older buildings where humidity levels vary. Fix securely using exterior-grade screws and countersink neatly, then prime all faces, including the back and ends, before painting or staining to limit moisture ingress. Store flat and off the ground in a dry location if not fitting immediately to prevent distortion.

FAQ

Is this cill suitable for listed buildings and conservation areas?

Yes. The machined timber profile is designed to replicate traditional sash window cill details, making it appropriate for listed buildings and conservation area properties where planning conditions require like-for-like timber replacement rather than uPVC alternatives.

Can I cut this cill down to a shorter length on site?

Yes, the 2.4m length can be cut to your required size using a standard hand saw or mitre saw. Always re-prime any cut ends before fitting to protect against moisture and extend service life.

What finish should I apply to a timber sash window cill?

A microporous exterior paint system or a quality exterior wood stain both work well. Apply a primer coat to bare timber first, paying particular attention to end grain, then follow with two topcoats for adequate weather protection in a UK climate.

For further sash window joinery components, browse the full range of pine mouldings at Nottage Timber Merchants. We supply trade and retail customers across South Wales, with next-day delivery available to the Bridgend area and surrounding regions.