I’m almost done building a 1000 SF stable and tack room for a client near Penticton, BC. Simple gable roof, 4:12 pitch, finished with rib-style metal roofing installed over 1×4 strapping @ 16″ o/c. The HO’s wife decided she wants skylights, after the fact. HO is a stucco contractor and does a lot of business with local building supplier, so he goes and orders 3 Columbia 2′ x 4′ low-E skylights in a natural finish to match the galvanised roofing. There’s no flashing kit available in galv so we have a local metal supplier bending custom flashing and counterflashing designed for 2×6 curbs.
I’ve searched a bit on Google and this board to try to find a construction detail on flashing into metal roof, but without much luck. Columbia doesn’t have a website and the recommended kit for Velux skylights employs an EPDM membrane with a clip-in fixture that appears to be dedicated to Velux. I’ve installed a few of these Columbia skylights into asphalt roofs without problems but never into metal. Instinct and experience tell me I would lap the head and side flashings in the same sequence as for shingle roofs. Anyone care to confirm or debunk this notion? Tips and hints gratefully accepted.
Edited 2/5/2008 10:17 am by slykarma
Replies
i have 7 velux skylights on my home and none of them leak and the roof is steel 1873, 12 12 pitch
the flashing from velux goes under the steel with a foam strip on each side , along the bottom it goes over the steel
the bottom strip is made of lead it appears and is rippled so you can mold it to conform to the roof profile
under all this is ice and water shield brought up the sides of the skylight under the flashing
the velux instructions did show how to flash on strapping
i have installed columbia in the past and found them to be a pos thus the reason for using velux
Thanks for the reply but I'm stuck with the Columbias unless you can finesse my client into returning them and buying Velux.
Anyone else?Lignum est bonum.
If one manufacturer has a flashing kit that will work in your application, and the other does not, then the solution is simple.
One installation is warranteed, and the other is not.
Caulk can "make" something waterproof... for a while.
Anyone else?
All I can say is, in the past, I've been talked into doing things like this I was uncomfortable with and they have all cost me, some significantly.
I always use automobile analogys - most people seem to relate to them.
"You've bought the wrong spark plugs. Nothing wrong with them in general, they're just not the right ones for this engine" or something like that.
Good luck.http://grantlogan.net/
I refuse to accept that there are limitations to what we can accomplish. Pete (I am so in love with myself) Draganic