Velux skylight curb -- PT lumber or regular?

amakarevic · 05-30-2012, 04:07 PM

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.

thanks

OldNBroken · 05-30-2012, 04:40 PM

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.

tinner666 · 05-30-2012, 05:00 PM

Regular wood like the rest of the house.

Windows on Wash · 05-30-2012, 05:22 PM

+1

PT lumber may also negatively interact with metal components of the flashing or fasteners. Standard lumber is proper.

05-30-2012, 04:07 PM	#1
amakarevic Member Join Date: Apr 2007 Posts: 2,082	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. thanks

05-30-2012, 04:40 PM	#2
OldNBroken Doing This Way Too Long Join Date: Jun 2008 Location: North Idaho Posts: 1,019	Velux skylight curb -- PT lumber or regular? 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.

05-30-2012, 05:00 PM	#3
tinner666 Pro Slate Roofer Join Date: Mar 2005 Location: Richmond, Va. Posts: 1,426	Velux skylight curb -- PT lumber or regular? Regular wood like the rest of the house. __________________ Frank To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

05-30-2012, 05:22 PM	#4
Windows on Wash Exterior Construction Join Date: Aug 2011 Location: VA, MD, DC Posts: 3,846	Velux skylight curb -- PT lumber or regular? +1 PT lumber may also negatively interact with metal components of the flashing or fasteners. Standard lumber is proper. __________________ To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Velux skylight curb -- PT lumber or regular?