Horizontal Closer


Rockwool stone wool to polythene damp proof course cavity closer.

The Rockwool insulation used for the horizontal closer is pre-compressed to enable it to take up any minor irregularity in the wall void. This procedure also makes the insulation more flexible and easier to handle.

Complies with Building Regulations (E&W) Approved Document E and the National House Building Council (NHBC) Requirements.


The damp proof course conforms to BS 6515:1984.

Fire resistance to BS 476-20:

  • Two hours insulation and integrity. Also provides at least two hours resistance to the spread of fire past the separating floor, when installed immediately above a row of metal wall ties or when installed with fixing clips.
  • The mineral wool is non-combustible in accordance with BS476-4:1970.

Acoustic rating:

Designed to provide resistance to the passage of flanking sound within the wall cavity adjacent to separating floors.

General information

Uniclass 2015

Pr_35_90_50_64 Plastics cavity closersPrimary


F30/18 Cavity closers

F30/180 Cavity closers

Product range

Thermal And Acoustic Insulation

Specification data - Plastics cavity closers

Product Reference

Horizontal Closer

Standard product features

Size (l x w):

  • Rockwool stone wool insulation: 1200 x 260 mm.
  • Damp proof course polythene: 1300 x 600 mm.

- Overlaps:

  • Top: 300 mm.
  • Bottom: 40 mm.
  • End: 100 mm.

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