Burnt Oak Builders Merchants

Undercloaking Sheet 1.2mtr

In stock
£2.39
All prices exclude VAT and will be calculated at checkout.
Undercloak (or undercloaking) boards are rigid, fibre cement strips designed for use on roof verges, positioned beneath the roof tiles and battens to create a secure, weatherproof edge. They provide a stable, moisture-resistant base for mortar, protecting the timber batten ends from rain.
Delivered within 3-5 days
On-hand customer support
Available for collection

Key Product Specifications

  • Material: Autoclaved Fibre Cement (non-asbestos)
  • Standard Size: Typically 1200mm x 150mm (sometimes 1220mm)
  • Thickness: Commonly 3.2mm or 4.5mm
  • Colour: Light Grey
  • Fire Rating: Meets BS 476:1989 part 6 & 7

Application and Installation

  • Purpose: Supports a bed of mortar at the verge, creates a clean finish, and prevents water ingress.
  • Installation: Installed at the verge, with the smooth side often placed against the brickwork and the rough side up for better mortar adhesion.
  • Positioning: Placed on top of the felt (not directly on brick) and under the tile battens, usually with a 2-inch (approx. 50mm) overhang.
  • Fixing: Nailed directly into the ends of the roof battens. 

Why choose Burnt Oak for your building supplies?

  • Quick Delivery

    Materials delivered quickly, so your building project never skips a beat.

  • 10+ Years Experience

    Decades of hands-on experience, helping local builders get the job done.

  • Wide Product Range

    One stop, everything you need. Quality materials for every stage of the build.