Thermal Cavity Closers

G241-G241M

The G241 is an economical, single extrusion fitted version of the G240. It is also used in sill details by simply cutting a length to suit the width of the window and placing it in the cavity at the sill.

  • Description & Key Features

    Product Description

    The G241 is an economical, single extrusion fitted version of the G240. It is also used in sill details by simply cutting a length to suit the width of the window and placing it in the cavity at the sill. G241 not only provides a thermal break to the cavity but also acts as an effective vertical DPC barrier, a DPC is still recommended in horizontal applications.

    The lightweight closers are available in sizes to suit all cavity widths and are simply installed, requiring no special tools. Lengths can be simply cut with a saw, with no loss of thermal efficiency, and with some specific products, PVC flanges provide a secure method of fixing.

    The closer can be used in individual lengths, or some may be preformed into frames or fixed directly on to window and door frames.

    The G241M Multi Width Cavity Closer has groove guides which allow it to be cut to a variety of widths.
    The cavity closer is non-load bearing and should not be used as replacement for traditional methods of fixing window and door frames to the masonry.

    Key Features

    • Lengths easily joined together without loss of thermal efficiency
    • Single flange feature
    • Insulation providing GWP rating of less than 5
    • Available in varying cavity widths and a multi width option
  • Technical

    Fitting Requirements

    Brick up to sill height, cut and fit the sill closer. Cut the jamb lengths 75mm oversize and trim the flange back to allow them to overlap the sill closer once fitted.

    Continue to brick up the wall, using the fixing clips to tie the closer into the masonry as you go.

    In refurbishment situations, the closer can be screwed and plugged into the masonry through the fixing holes provided.

    Certifications

    Manthorpe Thermal Cavity Closers - BBA Certificate - 96-3226.pdf

    Regulations & Standards

    BS 5250:2011 Control of condensation in buildings.

    Approved Document L1 & L2:
    Conservation of fuel and power.

    NHBC Technical Guidance 6.7:
    Doors, Windows & Glazing

    BRE Digest Report 262: Thermal Insulation: Avoiding Risks.

    BRE Information Paper IP 1/06: Thermal Bridging at Junctions & Openings

  • Specifications

    Size Information

    Length 2.44m

    Cavity width: from 50mm to 100mm

    Wider cavity sizes are available to order as specials up to 150mm.

    Material

    Extrusion: UPVC

    Insulation: CFC & HCFC Free. Extruded Polystyrene

    Colour

    Extrusion: White

    Insulation: Yellow

    Quantity Information

    6 lengths per pack

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