The Horizontal Closer is a Stone wool to polythene DPC Cavity Closer.

It has been designed to provide at least 2 hours’ resistance to the spread of fire past separating floors. It also significantly reduces flanking sound transmission within masonry wall cavities adjacent to separating floors.


The Horizontal Closer should be installed in the external cavity wall at the level of the separating floor. The closer is installed with the wide DPC overlap uppermost, as indicated in the illustrations with the DPC embedded into the inner blockwork in the mortar layer above the closer, so as to form a cavity tray.

If being used as a fire closer, the product must be positioned immediately above a row of metal wall ties. If this is not possible the Horizontal Closer can be supplied with fixing clips. These are embedded into the mortar joint above floor level and the Horizontal Closer is impaled onto the clips.


The Horizontal Closer will provide a fire rating of up to 2 hours.

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