125mm Double Flange Thermal Cavity Closer - 2.5m length - pack of 6

G240 125mm Double Flange Thermal Cavity Closer from Manthorpe Building Products is a high-performance cavity closer designed to provide thermal insulation and moisture control at door and window reveals in cavity wall constructions. Featuring a double flange profile, it offers secure positioning within the cavity and is suitable for use in both standard in-line reveals and sill details.

CHARACTERISTICS

• Suitable for 125mm cavity
• Extruded uPVC with a CFC-free polystyrene core
• Acts as a thermal cavity closer and vertical damp-proof course (DPC)
• Double flange design ensures secure placement and consistent sealing
• Simple single-person fitting, no specialist tools required
• Can be easily cut to size with a saw—without compromising thermal efficiency
• Compatible with Manthorpe fixing clips for secure mortar ties and corner forming
  
• Lightweight and durable, ideal for both new builds and refurbishment projects

APPLICATION

• Suitable for use around timber doors and windows, and may contribute to cavity barrier compliance when installed as part of a full detail

Installation Notes:

• For horizontal applications (e.g. sills), a separate DPC is still recommended
• Can be used as individual lengths or preformed into frames
• Designed for non-load-bearing use—should not replace structural fixings for frames

CERTIFICATION

• BBA Certified – Certificate No. 96/3226