Frequently Asked Questions

XPS board, or extruded polystyrene foam board, is made from rigid polystyrene with high compressive strength. Its closed-cell structure provides excellent long-term thermal insulation performance because of its inherent resistance to moisture transfer.

• Standard thickness: 30mm, 40mm, 50mm

• Special-order thickness: 60mm-100mm

• One standard width: 600mm

• Standard lengths (in mm):
  1 800 | 2 100 | 2 400 | 2 700 | 3 000 | 3 300 | 3 600 | 4 000 | 4 200 | 4 800 | 5 400 | 6 000 | 6 600 | 7 200 | 8 000

• If your application is nail-up ceiling or between trusses, order Summit concealed clips and Summit adhesive.

• For sound insulation, order Knauf insulation rolls.

• Summit cornices will finish off the perimeter of any room, and neaten boards between trusses.

• You’ll need ±3 clips per m².

• You’ll need ±1 litre of adhesive per 30m².

Sagging of Summit XPS board, which will occur if:

• The recommended spacing of substructure is exceeded;

• The correct amount of adhesive is not used on the substructure;

• Heavy lights or fittings are installed directly into the board. (Fixing methods should be discussed with one of our representatives/specialists.)

Shrinkage of Summit XPS board, which will occur if:

• The wrong type of lighting is used;

• The board is installed too close to heated chimney pipes. (Please contact one of our representatives/specialists.)

Dust collecting on Summit XPS board

• Boards must be cleaned/wiped down with a solution of fabric softener or dishwashing liquid in water, to remove the static electricity buildup that causes dust particles to settle.

• Avoid butt joints.

• Always secure boards along the tongue-and-groove ends to prevent movement.

• Increase substructure spacing when installing Summit XPS board in areas that are exposed to wind.

• If painting Summit XPS board, use only water-based paint. The use of any solvents will damage the Summit XPS board.

• Through an accredited local retailer

• By contacting us directly.