Intersecting Double Ridge & Valley Beam Connections
Intersecting Double Ridge & Valley Beam Connections
(OP)
I've been tackling this issue for a while now and have had some discussions with builders regarding these connections.
Best way to start this discussion is to view the following video:
http ://www.ask thebuilder .com/Valle y_Rafter_V ideo.shtml
I'm set on using Simpson Hangers for this application, but most framers refuse to believe that the sloped and skewed hangers are really necessary and if they can be installed properly. Truth is they are difficult to install, it's tough getting all the nails in properly, etc. This is due to framers wanting every cut tight and believing that the sloped roofs are leaning against each other and that they act like a wedge. I agree it's good to do this, but as engineers we have little to hang our hat on to determine safe capacities based on the wedge action and toe nails only.
I know Simpson also makes the Multiple Seat Connector, but try and sell that to a residential framer, and they have limitations.
I wanted to get thoughts on how you believe this is truly behaving and if it is too conservative to try and deliver the reactions as if it was a flat roof.
Thanks......
Best way to start this discussion is to view the following video:
http
I'm set on using Simpson Hangers for this application, but most framers refuse to believe that the sloped and skewed hangers are really necessary and if they can be installed properly. Truth is they are difficult to install, it's tough getting all the nails in properly, etc. This is due to framers wanting every cut tight and believing that the sloped roofs are leaning against each other and that they act like a wedge. I agree it's good to do this, but as engineers we have little to hang our hat on to determine safe capacities based on the wedge action and toe nails only.
I know Simpson also makes the Multiple Seat Connector, but try and sell that to a residential framer, and they have limitations.
I wanted to get thoughts on how you believe this is truly behaving and if it is too conservative to try and deliver the reactions as if it was a flat roof.
Thanks......






RE: Intersecting Double Ridge & Valley Beam Connections
this type of framing time tested.
RE: Intersecting Double Ridge & Valley Beam Connections
The biggest problem, IMO, is that when the hip rafters are just nailed they are less safe than hangers until the roof sheathing is applied. (Unless they are all supported during construction properly.) And without the roof sheathing the ridge beam would not be laterally supported to resist the wedge action.
Once the sheathing is applied, than for normal spans, I am okay with the nailing. I would note on any detail the maximum span and that the ridge and rafters be supported (vertically and horizontally) until the roof sheathing is applied in bold, enlarged or underlined letters.
Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.
RE: Intersecting Double Ridge & Valley Beam Connections
Up to what size roof do you think it's OK to do it traditionally?
What if the main ridge is 30' long and the intersecting ridge is 16' long and the snow load is 40 PSF?
RE: Intersecting Double Ridge & Valley Beam Connections
I guess you'll have to run numbers to see what capacity the connection has sans the plate connectors.
I have never used a sloped skewed connector for hip & valley framing.
As Garth alludes, the sheathing overtop the rafter onto the hip/valley/ridge also adds capacity.
Nailing hip & valley rafters is actually easier than a normal ridge, IMO.
RE: Intersecting Double Ridge & Valley Beam Connections
www.idecharlotte.com
RE: Intersecting Double Ridge & Valley Beam Connections
Anybody else have any input or experience with the Simpson skewed and sloped hangers?
RE: Intersecting Double Ridge & Valley Beam Connections
More work for the framer, but it makes the connection more stable until the sheathing is applied.
Mike McCann
MMC Engineering