| SPECIFYING APA PERFORMANCE RATED I-JOISTS The following is a guide for specifying APA Performance Rated I-Joists (PRI)
to be used in residential floor applications. These structural products are available in
net depths of 9-1/2 inches, 11-7/8 inches, 14 inches, and 16 inches, and can be used for
simple-or multiple-span floor construction with a design live load of 40 psf and dead load
of 10 psf or 20 psf as applicable. Exterior uses, or use of wood I-joists in other than
protect dry conditions, is not recommended.
A. General
1. APA PRIs shall be furnished and installed as
shown by the approved building plans and installation instructions.
2. The designation of APA PRI shall be based on the
applicable loading, joist spacing and spans shown in the plans. PRIs may be selected
from Span Ratings using Table 2 of the APA Design/Construction Guide: I-Joists for
Residential Floors. For non-uniform loading conditions requiring an engineering
analysis, see Table A1 from the above-mentioned guide for PRI joist properties.
The specification for I-joists required for a specific floor
application shall include joist designation, length, and number of pieces required.
Example: 21 pieces-
APA PRII x10 - C4 x 30 feet long.
3. All accessory products such as I-joist blocking
panels, rim boards, squash blocks, web stiffeners, etc., shall be provided and installed
in accordance with the applicable installation details shown in this guide.
| TABLE 6 |
| DIMENSIONS FOR APA
PERFORMANCE RATED I-JOISTS |
| APA PRI™ |
| Joist Series |
Joist Designation |
Nominal Depth |
Net Depth |
Flange Width |
| Ix10 |
C4 (PRI-15) |
10" |
9-1/2" |
1-1/2" |
| Ix10 |
C6 (PRI-25) |
10" |
9-1/2" |
1-3/4" |
| Ix12 |
C10 (PRI-15) |
12" |
11-7/8" |
1-1/2" |
| Ix12 |
C12 (PRI-25) |
12" |
11-7/8" |
1-3/4" |
| Ix14 |
C14 (PRI-25) |
14" |
14" |
1-3/4" |
| Ix14 |
C16 (PRI-35) |
14" |
14" |
2-5/16" |
| Ix16 |
C18 (PRI-25) |
16" |
16" |
1-3/4" |
| Ix16 |
C20 (PRI-35) |
16" |
16" |
2-5/16" |
| Ix10 |
S2(PRI-30) |
10" |
9-1/2" |
2-1/2" |
| Ix10 |
S4(PRI-32) |
10" |
9-1/2" |
2-1/2" |
| Ix12 |
S6 (PRI-30) |
12" |
11-7/8" |
2-1/2" |
| Ix12 |
S8 (PRI-32) |
12" |
11-7/8" |
2-1/2" |
| Ix12 |
S10 (PRI-42) |
12" |
11-7/8" |
3-1/2" |
| Ix14 |
S12 (PRI-32) |
14" |
14" |
2-1/2" |
| Ix14 |
S14 (PRI-42) |
14" |
14" |
3-1/2" |
| Ix16 |
S16 (PRI-32) |
16" |
16" |
2-1/2" |
| Ix16 |
S18 (PRI-42) |
16" |
16" |
3-1/2" |
Notes:
1. Tolerance permitted at time of manufacture:
- flange width = +/- 1/32 inch
- I-joist depth =+0 inches, -1/8 inch
4. APA EWS trademarked glue laminated
timber (glulam) or approved structural composite lumber (SCL) shall be furnished for
load-bearing joist headers. The depth of these components shall be specified to match the
I-joist depth when flush framing is required.
5. The contractor shall use approved connection
hardware (joist hangers) as specified in the plans. Such hardware shall be compatible with
the width and depth of APA PRIs furnished, to provided flush nailing surfaces at adjoining
members and to prevent rotation.
B. Manufacture
1. Materials, Manufacture, and Quality Assurance.
Product quality shall conform to the manufacturer's approved quality control manual, with
compliance assurance services provided by APA in accordance with building code
requirements and the applicable code evaluation report.
2. Trademarks. I-joists
shall be marked with the APA PRI trademark indication conformance with the manufacturing,
quality assurance, and marking provisions for APA EWS Standard PRI-400, Performance
Standard for APA EWS I-Joists.
3. Jobsite Shipment.
I-joists shall be protected from direct exposure to weather prior to installation. |
