(1) This Section applies to heat, air and water vapour transfer and measures to control condensation.
(2) All walls, ceilings and floors separating conditioned space from unconditioned space, the exterior air or the ground shall be,
(a) provided with,
(i) thermal insulation conforming to Subsection 9.25.2.,
(ii) an air barrier system conforming to Subsection 9.25.3., and
(iii) a vapour barrier conforming to Subsection 9.25.4., and
(b) constructed in such a way that the properties and relative position of all materials conform to Subsection 9.25.5.
(3) Insulation and sealing of heating and ventilating ducts shall conform to Sections 9.32. and 9.33.