White UPVC Capping Board – 1.25m Long, 9mm Thick (2 Pack – 100–400mm Depth Options)

Refresh and upgrade your window sills with this convenient 2 Pack of White UPVC Capping Boards, each 1.25 metres long and 9mm thick. Designed for quick and effective refurbishment of tired timber or MDF sills, these durable boards offer a neat and professional finish—no need to remove the existing sill.

Manufactured from rigid, exterior-grade UPVC, they are waterproof, UV-stable and highly resistant to warping or discolouration. Perfect for use in kitchens, bathrooms, conservatories and utility rooms, the gloss white finish is low-maintenance and wipe-clean.

Choose from depths between 100mm and 400mm to match your needs. The 9mm profile ensures strength and rigidity, while the 1.25m length is ideal for smaller windows or more precise installations with fewer joins.

Key Features

• 2 Pack – 1.25m Length Boards – perfect for multiple small sills or medium coverage
• Rigid 9mm Profile – more durable and stable than 5mm alternatives
• Glossy White Finish – wipe-clean, no painting or sanding required
• Waterproof & UV-Resistant – suitable for humid and sunny environments
• Easy to Install – cut to size and apply with grab adhesive
• Available Depths: 100mm, 150mm, 175mm, 200mm, 225mm, 250mm, 300mm, 400mm
• Optional Accessories – end caps, corners, and adhesive sold separately

Ideal Uses

• Refurbishing interior window sills
• Fast updates for property rentals or sales
• Covering water-damaged or discoloured timber
• DIY renovations or trade installations
• Use in kitchens, bathrooms, and conservatories

Technical Specifications

Installation Guide

1. Clean and degrease the existing sill
2. Cut the board to required length using a fine-tooth saw
3. Test fit and adjust if needed
4. Apply strong grab adhesive to the reverse side
5. Press firmly in place and hold for at least 60 seconds
6. Optional: seal edges with silicone or use matching end caps

Why Buy from Windows4You?

Windows4You is a trusted UK supplier of UPVC window trims, fascia boards, soffits, and capping boards. We source directly from manufacturers to offer you unbeatable quality, availability and price—with fast delivery and expert support every step of the way.