Soffit Board

Roofing Undercloak Strips & Roof Verge Protection

At County Building Supplies, we supply roofing materials and accessories for professional roofers, builders, contractors and DIY customers. Our range includes 1200 x 150mm soffit strip undercloak, commonly used when forming traditional roof verge details on suitable pitched roofs.

Undercloak strips help provide a supporting surface beneath the mortar bedding at the edge of certain tiled roofs, contributing to a neat and correctly formed verge finish.

What Is a Roofing Undercloak Strip?

An undercloak strip is a flat roofing component installed beneath the edge of roof tiles at a traditional mortar-bedded verge.

It provides support for the mortar bedding and helps create a consistent roof edge detail. Undercloak strips are typically used with compatible roof tiles and verge construction methods.

The correct material, positioning and fixing method should follow the roof specification and relevant installation guidance.

Undercloak vs Soffit Board – What's the Difference?

Although the names can sometimes cause confusion, roofing undercloak and soffit boards serve different purposes.

• Roofing undercloak: Used at certain pitched roof verges to support the mortar bedding beneath roof tiles.
• Soffit boards: Typically fitted beneath the roof overhang between the fascia and external wall to finish and protect the eaves area.

County's listed 1200 x 150mm undercloak strip is intended for suitable roofing verge applications, rather than as a replacement for standard fascia or soffit boarding.

Choosing the Correct Undercloak Size

County stocks undercloak strips measuring 1200mm long x 150mm wide.

Before ordering, check the required verge detail, roof tile arrangement and installation specification to confirm the strip is suitable for the application.

The undercloak must be adequately supported and correctly positioned to provide a suitable base for the specified verge finish.

How Many Undercloak Strips Do You Need?

Measure the total length of the roof verges where undercloak is required. Each strip measures 1.2m in length.

Divide the total verge length by 1.2 to estimate the number of strips needed, then round up and allow additional material for cutting waste and any required joints.

For example, a 6m verge would require a minimum of five 1.2m strips before allowing for cutting and detailing.

Installing Roofing Undercloak Correctly

Undercloak strips should be installed in accordance with the roof design and manufacturer's recommendations.

Correct support, positioning and compatibility with the specified verge system are essential. Traditional mortar-bedded verges may also require mechanical fixing of tiles and other measures under the relevant roofing specification.

Roofing work at height should always be carried out using suitable access equipment and safety precautions.

Need Advice?

Not sure whether an undercloak strip is suitable for your roofing project? Visit your local County Building Supplies branch or contact our team for product information and availability.