ARC Cavity Stop Sock will provide fire and thermal properties when used around window and door openings. You will need to consider moisture penetration in your design as the product does not include an integral DPC.

ARC Cavity Stop Sock is designed to be simply compression fitted as the brick and block work progresses. No mechanical fixing is required, with the compression fit holding the barrier in place. Care should be taken when handling the product to ensure that the mineral wool isn’t damaged. The person installing the ARC Cavity Stop Sock should first familiarise themselves with this datasheet, ensuring the correct size of product is being fitted into the cavity.

The barrier must fully fill the cavity from external brick to internal block. Any cavity insulation must be cut back at the location of the barrier, and care must be taken to ensure that the built cavity width is accurate and that the size of barrier fitted is appropriate to this.

Vertical application: we recommend building up the internal block work first. Then progress several courses of brickwork, before installing the barrier. The brickwork can continue, building the barrier in. Care must be taken to ensure the correct compression fit is achieved.
Horizontal application: build the brickwork up to the level the barrier will be installed, ensuring the width of the cavity is correct. Allow the brickwork to set, before push fitting the barrier in to place and under the correct compression.
At the end of a run, or at a corner, lengths of barrier should be cut to the required length, and then tightly butt jointed ensuring no gaps remain.
The polythene encapsulation does not contribute to the performance of the barrier, but offers weather protection and product identification. We recommend that it is left in place for these purposes, however if it becomes torn or damaged there is no cause for concern.
You should not attempt to squash the barrier before installation. Although this can make the barrier easier to fit, it is likely to cause gaps and may damage the barrier, resulting in reduced performance.

The polythene sleeve is there to provide product identification and protection from the elements and should therefore be left in place. It does not add to the performance of the product so can be safely cut in to, and the product can still be used should the polythene be damaged.

The product does not include an integral DPC. A separate cavity tray or DPC should be installed where this is required by the location or type of building.

ARC Cavity Stop Socks are designed to suit specific cavity widths and are available in 5mm increments. It’s important that the appropriate size is fitted to achieve the required compression fit and to ensure the product performs as expected.