I've got a bonus room built above a garage (in the rafter space). There
is an LVL beam running across the garage ceiling with 2x10 joists
lapped over it. However, under the kneewall in the bonus room, there
are short joists (about 2 feet long) running parallel to the beam which
tie into the rafters. What are these short joists called - lookout
Also, there are short 2x4s at a 45 degree angle from floor joists to
rafters - this is inside the knee wall on about every third or so
joist (somewhat random). Are these called struts? The rafter span is
only about 9-10' SPF 2x8s on 16c - can I remove these struts to gain
storage in the knee wall area?
Gable ends, beam is perpendicular to the ridge. The floor joists are
perpendicular to the beam up to a couple of feet from the exterior
walls. Then, there are short joists (parallel with the rafters) which
sit on the top plate.
I guess I was thinking about this because of Rico's comment about not
transferring rafter load to the floor joists (which is happening with
Yeah, but the knee-wall is already doing that anyway.
Which, come to think of it, means that I don't know
what the diagonals are doing anyway. Are these pre-built
trusses around your bonus-room, or was it all built on site?
Do you have any place you could stick a sketch?
Stick built on site, no trusses (2x10 floor joists, 2x8 rafters). The
"lookouts" span 2 feet from a doubled joist parallel to the exterior
wall top plate.
I guess the concern with these lookouts is that with this setup, there
is not much to resist the rafters from pushing out on the exterior
walls. It is relying on a toe-nailed connection between these short
lookout joists (parallel to rafters) and the doubled joists
(perpendicular to rafters).
They are called braces. They are connected to a continuous purlin which is
connected to the rafters. Braces are there to reduce the span of the
rafters. It would be unwise to remove them, the rafter may sag in the center
if you do so.
I think you are right in that they are called braces (they are about
1.5 feet long). However, they are not connected to a purlin - they are
nailed to the sides of the rafters and joists.
The rafter span is only about 12 feet - SPF 2x8s, 16"c, 12/12 slope
will span over 15 feet here in the South. Why can't I remove the
Because you don't what they're doing, and you don't want to
find out by having whatever it is start moving, and because
removing them doesn't buy you anything useful. What are
you trying to store that you can't store with them in place?
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