Tempo:
Joist-Type Roof Ceilings When roofing is attached directly to the top of ceiling joists as is the case for cathedral or sloped ceilings, the space above the insulation must be
vented to prevent the accumulation of moisture, or the space must be filled with insulation (such as sprayed closed-cell foam) that prevents air vapour from condensing within the insulation or on other surfaces in the roof (Figures 25 and 26).
25 Insulating joist-type roof ceiling between the ceiling and sheathing roof sheathing 89 mm (31⁄2 in.) recommended ventilation space cross members prefinished fascia perforated soffit insulation batts air barrier system and vapour barrier gypsum board roof joists
26 Alternative method of insulating joist-type roof ceiling between the ceiling and sheathing holes in web to cross ventilate between joists 63 mm (21⁄2 in.) minimum ventilation space roof sheathing wood I-joist baffle prefinished fascia perforated soffit insulation air barrier system and vapour barrier ceiling
vented to prevent the accumulation of moisture, or the space must be filled with insulation (such as sprayed closed-cell foam) that prevents air vapour from condensing within the insulation or on other surfaces in the roof (Figures 25 and 26).
25 Insulating joist-type roof ceiling between the ceiling and sheathing roof sheathing 89 mm (31⁄2 in.) recommended ventilation space cross members prefinished fascia perforated soffit insulation batts air barrier system and vapour barrier gypsum board roof joists
26 Alternative method of insulating joist-type roof ceiling between the ceiling and sheathing holes in web to cross ventilate between joists 63 mm (21⁄2 in.) minimum ventilation space roof sheathing wood I-joist baffle prefinished fascia perforated soffit insulation air barrier system and vapour barrier ceiling
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