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Old 05-30-2012, 03:07 PM   #1
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Velux skylight curb -- PT lumber or regular?

i need to build a simple 2x6 frame to act as curb for my Velux VCM 2222 skylight. there will be flashing around it as well as the protective tape that came with the flashing kit. i was wondering if i should use PT lumber or regular. i heard that PT lumber can corrode aluminum flashing but then again, there will be that tape in between, i believe.



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Old 05-30-2012, 03:40 PM   #2
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No need for PT as it is 100% sealed from the elements by the flashing. And, yes, it can corrode the aluminum but that is secondary. We never use PT on any curbs.


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Old 05-30-2012, 04:00 PM   #3
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Regular wood like the rest of the house.
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Old 05-30-2012, 04:22 PM   #4
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PT lumber may also negatively interact with metal components of the flashing or fasteners. Standard lumber is proper.
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