Xtra-Load DPC Joint Support System

Xtra-Load DPC Joint Support System

The Xtra-Load DPC Joint Support System should be used at all lap joints in cavity trays to ensure that a watertight seal is maintained, complying with the requirements of the current code of practice for the installation of damp-proof courses.

Using the Joint Support System allows you to make quick and effective joints between lengths of cavity tray, saving both time and money on site. The system provides a rigid support to the cavity tray behind each joint. The system will support joints across clear cavity widths up to 75mm.

Features & Benefits

  • Provides full support to cavity tray joints.
  • Ensures a watertight joint with no risk of sagging.
  • Improves quality of workmanship.
  • Quick and easy to install.
  • Accommodates a range of clear cavity widths.
  • Can be fitted within standard mortar joint thickness.
  • Complies with the requirements of current Codes of Practice.

Product Range 

Xtra-Load DPC Joint Support System is manufactured from a 100mm wide strip of flexible polymer membrane with an FR expanded polystyrene wedge fixed to the back to give support across the cavity, an integral drip prevents moisture transmission across the cavity.

Product Code Description Pack Qty
310042 Xtra-Load DPC Joint support 315mm x 150mm 10

Quick and easy to install


Step 1 – position joint support in front of cavity insulation.   
Step 2 – remove release film from tape on joint support and bond to DPC.  
Step 3 – apply Xtra-Load DPC Jointing Tape to end of linear cavity tray.  
Step 4 – remove release film from DPC Jointing Tape and bond next linear cavity tray   DPC_Joint-Strip-04 jpg


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