Measure the room you are insulating. Each board is 600 mm wide; pick the length that suits the room.
Enter the room's length and width to see how many you need.
The 10% waste allowance is our suggestion, not Summit's: it covers cuts at the walls. For a nail-up ceiling, battens go at no more than 700 mm centres, with 3 concealed clips per m² and about 1 litre of Summit XPS adhesive per 30 m². Tell us the profile you want (SMTG, PITG, SBTG or SMST) in your message.
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