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Okay everybody – A new twist to the same question.
In a roof with a valley – two intersecting roofs – how do you vent between the valley rafter and the valley jacks anyway ??? As soon as the last common rafter is vented the remaining jack rafters are blocked off from the ventilation system. Thus, in this type roof what should be done to ventilate ? Top and bottom edge cutouts would seem to weaken the rafters ?
If warranty of roofing shingles is a concern and packing with rigid foam (no ventilation) is the way to go then are there guidelines as to what parts of the country you can or should not do this this and what locations is might not be a problem for the roof shingles. As mentioned, Elk allows shingles on SIPS, are there other manuf doing the same or limiting their approval to certain locations.
Replies
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Okay everybody - A new twist to the same question.
In a roof with a valley - two intersecting roofs - how do you vent between the valley rafter and the valley jacks anyway ??? As soon as the last common rafter is vented the remaining jack rafters are blocked off from the ventilation system. Thus, in this type roof what should be done to ventilate ? Top and bottom edge cutouts would seem to weaken the rafters ?
If warranty of roofing shingles is a concern and packing with rigid foam (no ventilation) is the way to go then are there guidelines as to what parts of the country you can or should not do this this and what locations is might not be a problem for the roof shingles. As mentioned, Elk allows shingles on SIPS, are there other manuf doing the same or limiting their approval to certain locations.