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Table 1. Technical Requirements for Physical Properties
Property Unit Requirement for CAN/ULC-S705.1-15
Minimum Maximum
Air permeance (mandatory material testing) L/s @ 75 Pa No min. 0.02
Air permeance (optional system testing) L/s @ 75 Pa
Apparent core density kg/m3 28 No max.
Compressive strength kPa 170 No max.

Dimensional stability volume change at:

–20°C % –2 5
80°C % –2 8
70°C, 97 ± 3% RH % –2 14
Surface burning characteristics – flame spread rating No min. 500 Footnote (1)
Fungi resistance No growth
Open-cell content volume % No min. 10

Long-term thermal resistance (LTTR) Footnote (2) of a 50-mm-thick specimen at

25-mm-thick m2·°C/W Declare No max.
50-mm-thick 1.80
75-mm-thick Declare
Tensile strength kPa 200 No max.
Volatile organic emissions (time-to-occupancy) d - days No min. 30
Water absorption by volume % No min. 4
Water vapour permeance of a 50-mm-thick specimen ng/(Pa·s·m2) No min. 60