ARCH 132
2011 Oregon Residential Specialty Code
Class/Homework Assignment
Chapter 5
Floors
Name: KEY______Date: ______
A wood floor meets fire protection requirement if a minimum5/8"______thick sheathing is used.
R 501.3 ______
Blocking in floor systems shall be a minimum of 1.5 _____ inches thick.
R 502.1.2______
Floor Joists or beams shall have a minimum1.5 ______inches bearing on wood and 3 ____ inches on concrete
R 502.6 ______
Floor Joists from opposite sides that lap on a center bearing support must lap a minimum 3 _____ inches and be nailed together with a minimum of 3 _____ 10d nails.
R 502.6.1 ______
Ends of joists supported laterally by solid blocking must be full depth and 2 ___ inches nominal thick.
R 502.7 ______
A (#2) 2 x 12 floor joist, douglas fir-larch, dead load 20 psf, @ 16" O/C spacing will span
17'- 10" ______
Table R 502.3.1(2) ______
List the features that determine the span distance for dimensional lumber floor joist
Species ______
Grade ______
Dimensions ______
O/C joist spacing ______
Dead load ______
Table R 502.3.1(2) ______
The ratio of backspan to a cantilever floor joist supporting exterior light frame, bearing wall and roof shall be at least ratio of3:1 ______
Table R 502.3.3 (1) ______
Table R 502.5(1) Exterior Bearing Wall, Girder/Header Span tabulated values assume a #2 _____ grade lumber.
Bridging is required in floor Joist exceeding a nominal 2 x 12 _____ x ______inches. These perpendicular lateral supports shall be placed at intervals not exceeding 8 ______feet
R 502.7.1 ______
Framed openings in floors may have a single header and trimmer the same size as the floor joists when the framed opening does not exceed 4 ___ feet.
R 502.10 ______
Notches in floor joist are not permitted in the center third ______of the joist length. The depth of a floor joist notch shall not exceed the nominal width divided by 6 ______. The width of the notch shall not exceed the end one third of the joist divided by 3 _____.
Figure R 502.8 ______
Beams must be connected to posts by gusset of either of the following materials
- 1/2"structural sheathing ______
- Minimum 1 x 4 wood lumber ______
- 16 gage steel plate ______
Figure R 502.9______
The width of post to beam gussets must be equal to or greater than post width ______
Figure R 502.9______
The length of the gusset shall be at least 2 ____ times the width or depth of the beam.
Figure R 502.9______
Beam that splice on posts shall have gussets on both sides ______of the beam.
Figure R 502.9______
Posts 4' to less than 8' shall have gussets on both sides______plus a minimum 1 x 4 ______
diagonal brace at 45 _____ degrees.
Figure R 502.9______
Holes may drilled in joist up to one third ______of the actual (nominal) depth.
Figure R 502.8______
The maximum O/C joist span for 5/8"plywood subfloor sheathing rated 40/20 is 20 ______inches.
Table R 503.2.1.1(1) ______