Thread: Framing supports under roof rafters

Any thoughts on these. House built in 08. These look like temp supports used while framing the rafters.

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Had a hard time with the image, but it does look like there is a ridge beam and the vertical 2x s do not serve any structural purpose. Why they ere used and then left behind is a good question other than just lazy. Frankly don't understand what problem they were having with the rafters that caused them to use the 2x in the first place. Will have to scratch my head a little for that answer.

It's unconventional for sure. The framing is lacking collar ties. I'd call it out for that alone.

Substantial rafter size. Not sure collar ties are required.

"2009 IRC R802.3.1Ceiling joist and rafter connections. Ceiling joists and
rafters shall be nailed to each other in accordance with Table
R802.5.1(9), and the rafter shall be nailed to the top wall plate in
accordance with Table R602.3(1). Ceiling joists shall be continuous
or securely joined in accordance with Table R802.5.1(9)
where they meet over interior partitions and are nailed to adjacent
rafters to provide a continuous tie across the building when such
joists are parallel to the rafters.

Where ceiling joists are not connected to the rafters at the top
wall plate, joists connected higher in the attic shall be installed as
rafter ties, or rafter ties shall be installed to provide a continuous tie.
Where ceiling joists are not parallel to rafters, rafter ties shall be
installed. Rafter ties shall be a minimum of 2-inch by 4-inch (51
mm by 102 mm) (nominal), installed in accordance with the connection
requirements in Table R802.5.1(9), or connections of
equivalent capacities shall be provided. Where ceiling joists or rafter
ties are not provided, the ridge formed by these rafters shall be
supported by awall or girder designed in accordance with accepted
engineering practice.

Collar ties or ridge straps to resist wind uplift shall be connected
in the upper third of the attic space in accordance with
Table R602.3(1).

Collar ties shall be a minimum of 1-inch by 4-inch (25 mm
by 102 mm) (nominal), spaced not more than 4 feet (1219 mm)
on center."

"Code Commentary: Collar ties or ridge straps
must be located in the upper
one-third of the attic space, be a minimum of 1 inch
by 4 inches (25 mm by 102 mm), be spaced not more
than 4 feet (1219 mm) on center and connected in accordance
with Table R602.3(1). The minimum prescriptive
connections in Table R602.3(1) for collar ties
and ridge straps are based on minimum connection requirements
using the 2001 Wood Frame Construction
Manual for slopes greater than 3:12, at a wind speed
of 100 mph (45 m/s) or less, for a roof span of 36 feet
(10 973 mm) or less [see Commentary Figures
R802.3.1(2) and R802.3.1(3)]."

Removing Collar Ties
Removing collar ties - Fine Homebuilding Question & Answer

Originally Posted by Raymond Wand

Removing Collar Ties
Removing collar ties - Fine Homebuilding Question & Answer

I wouldn't rely on that advice. Know what building code your local jurisdiction uses...the article references CABO and the UBC both of which no longer exist.

Originally Posted by mathew stouffer

Any thoughts on these. House built in 08. These look like temp supports used while framing the rafters.

I agree with Raymond, the rafters appear to have "plenty-o-size" for the diagonal. I'm guessing these were installed to use the strong rafters to support under sized ceiling joist, or ceiling joist which were weekend by removing (or moving) bearing walls. If this is the case, another bad idea.