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ROCKCLOSE® is an insulated damp proof course, specifically developed to minimise thermal bridging at door and window reveals in masonry cavity walls. The product consists of a strip of semi-rigid non-combustible ROCKWOOL® insulation, bonded to a black polyethylene DPC (to BS 6515), and designed to be installed as work proceeds between the outer masonry leaf and internal closer block prior to the frames being fitted.


  • Helps minimise thermal bridging around openings.
  • Easy to handle and install.
  • Self-supporting.
  • Built in as construction proceeds noise pollution.
  • Choice of thicknesses available.
  • Fire resistant cavity closer.

General information
Specification data
Product Reference



1200 x 100 mm


20 mm

30 mm

50 mm

Third party certifications
  • British Standards Institution (BSI) - certficate : ROCKCLOSE® complies with the requirements of BS EN13162: 2001 Thermal insulation products for buildings - Factory made mineral wool (MW) products specification
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