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[QUOTE="NJCuse97, post: 3128098, member: 5058"]
What I have heard is this, and I am not sure if I have said it before in another thread, so sorry if old dialogue: There was a late occurring realization about the roof "performance" that caused some early concerns and maybe even delays although by all accounts that has been recaptured. The two different roof materials will behave differently regarding expansion and contraction, and that was a problem itself, but with it came the realization that what causes that concern is the thermal properties of the material (U value) and that the rigid outer portion will transfer warmer interior temperatures at a slower rate (better R value) than the inner translucent portion. The current roof is one material so this is not a current issue. This difference is likely to cause snow on the inner portion to melt faster. That runoff will encounter the colder roof before it can reach the primary drainage system. As a result there is need for an intermediate drainage system that is more robust, in part because of the differential movement, and in part because of the temperature swings from day to night, from occupied to unoccupied, and simply because the snow that remains on the hard roof will refreeze the melt coming off the soft roof, creating an ice damn and increasing the potential to stop movement, an create weak points and potential leak points at the joint. Running the drains inside is related because otherwise they may have to heat trace the drains (to make sure it doesn't refreeze in the drain) which is not an expense they want to incur.
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