Great video, love the proclima products. I would note that that display model is a bit different than the standard house models most builders would encounter. That model has the primary insulation layer in the rafters, which means the 20mm cavity is compliant to 10.8.3 in the housing provisions of NCC. However, if the model had trusses, with the insulation batts on the ceiling, and the membranes installed in the same way, that wouldn't be compliant to 10.8.3 (in climate zones 6,7 and 8). This is my understanding, but I'd be interested to hear if anyone thinks different. The solution of course is just to provide ventilation the roof space, and there are some products that do this. I feel that these small ventilation details gets overlooked in the design, especially when you have different building styles such as exposed eaves.
That’s a great comment Gary. Yes indeed the model shown (cathedral roof) of the warm roof would be a different design to a cold roof (truss style), a cold roof would include the addition of an inlet at the lower side and ridge outlet for exhaust of the roof space, the ventilation opening requirements are listed in table 10.8.3 - NCC-2022 Condensation Management Provisions varying with pitch - noting that not all Australian states have adopted these standards yet. The Above Sheathing Ventilation (ASV) as shown in the video is critical to high levels of performance for moisture management in conditioned buildings, both warm and cold roofs but the design details may differ from building to building depending on it’s characteristics. It doesn’t need to be made overly complex whichever roof design you have but the basic science is the same and builders across Australia are innovating to create these details as cost effective as possible for healthier, more comfortable durable long lasting buildings.
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Great video, love the proclima products. I would note that that display model is a bit different than the standard house models most builders would encounter. That model has the primary insulation layer in the rafters, which means the 20mm cavity is compliant to 10.8.3 in the housing provisions of NCC. However, if the model had trusses, with the insulation batts on the ceiling, and the membranes installed in the same way, that wouldn't be compliant to 10.8.3 (in climate zones 6,7 and 8). This is my understanding, but I'd be interested to hear if anyone thinks different. The solution of course is just to provide ventilation the roof space, and there are some products that do this. I feel that these small ventilation details gets overlooked in the design, especially when you have different building styles such as exposed eaves.
That’s a great comment Gary.
Yes indeed the model shown (cathedral roof) of the warm roof would be a different design to a cold roof (truss style), a cold roof would include the addition of an inlet at the lower side and ridge outlet for exhaust of the roof space, the ventilation opening requirements are listed in table 10.8.3 - NCC-2022 Condensation Management Provisions varying with pitch - noting that not all Australian states have adopted these standards yet.
The Above Sheathing Ventilation (ASV) as shown in the video is critical to high levels of performance for moisture management in conditioned buildings, both warm and cold roofs but the design details may differ from building to building depending on it’s characteristics. It doesn’t need to be made overly complex whichever roof design you have but the basic science is the same and builders across Australia are innovating to create these details as cost effective as possible for healthier, more comfortable durable long lasting buildings.