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It shouldn't make a huge difference but higher is better as you ideally don't want it to spend most of its time submerged. Using the provided clips is a better solution long run as this puts less stress on all the components of the system.


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Besides simply extending the roof trusses, you could 1) Reinsulate the 3.5 inches between the roof trusses with something of higher performance, like spray in polyurethane. That is about twice the insulation value of fiberglass and contributes substantially to roof/joist solidity. 2) If twice the insulation is not enough improvement, instead of extending ...



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