Here’s how the instructions for a VELUX roof window show the framing. Is this really OK? Are there code requirements for roof opening framing? This looks way too easy.
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Replies
Depends, like everything. I wouldn't cut the rafter and just header its load out to the flanking ones unless I doubled them, or decreased the clear span with a knee wall or ceiling, or somehow picked up the additional load.
that's the only pic that really worried me.
Forrest - Velux is nice to work with - did you get the flashing kit?
I've installed several VELUXes (VELII?), always used their flashing kit- they really are a breeze to install and operate. Now sold through HD, they're also reasonably priced. I was just suprised when I saw the framing illustrations.
Why would you want it any more complex than what is shown in the pics?
It is really that simple. Really.
Conventional framing practices in the U.S. typically double the rafters on either side of a headed-off opening, something us 'Mericans do with our dinky 2x framing lumber.
It's not so much that the loading is smacked way up there due to the skylight. Think about it, it's practically nothing. It's that our dinky boards need a little thickening for nail purchase where the headers frame into the sides. Connectors could probably avoid that need for doubling.
But hey, let's not step on any framing contractors's sensibilities.
In Europe, most roof structures are timbered, with rafter members being much more substantial than our inch-and-a-halfers. And Velux is at heart, a European company, even though they now make them here in the Carolinas.
Depending on the size of the rough opening, you are right about not doubling the rafters on either side. At 4' and above you are require by code here to double the rafters or joist, as well as the headers, and use the appropriate hangers.
Dave
I was wondering about that EU vs. US factor. My rafters are full dimension 2x6 rough doug fir on 32" centers. Sheathing is 1/2" CDX over the original 1x6 strapping, with a single layer of asphalt shingles. Pitch is 12/12. Skylight is 45" x 46", so at least one rafter needs to be cut. Sure would make life easier to not have to double the adjacent rafters plate to ridge, which is over 20'.I guess my question is, do I HAVE to header and double adjacent like in a wall? What is code for this?Thanks
I prefer to double up all members around the opening myself. But if that's still too easy for you, then do it with a bundle of shingles in your toolbelt.