Connection Requirements
 |
| Note: This schematic
drawing is a construction detail recommended for attachment of a ledger in order to avoid
potential decay problems on either the ledger or other building components. After placing
flashing, temporarily hang 2x ledger. Drill clearance and lead holes, remove 2x ledger,
caulk holes with high quality caulking, immediately reapply 2x ledger and install the lag
screws. |
1. Floor sheathing to APA Performance Rated
Rim Board - Use 8d nails (box or common) at 6 inches o.c.
Caution: The horizontal load
capacity is not necessarily increased with a decreased nail spacing. Under no
circumstances should the nail spacing he less than 3 inches. The 16d (box or common)
nails used to connect the bottom plate of a wall to the rim board through the sheathing do
not reduce the horizontal load capacity of the rim board provided that the 8d nail spacing
(sheathing-rim board) is 6 inches o.c. and the 16d nail spacing (bottom
plate-sheathing-rim board) is not less than 12 inches o .c.
2. APA Performance Rated Rim Board to I-Joist
- Use two 8d nails (box or common), one each into the top and bottom flanges. This is
typical for rim board having a thickness up to 1-1/8 inches. A larger nail size may be
required by the l-joist manufacturer or for thicker rim board products.
3. APA Performance Rated Rim Board to Sill
Plate - Toe-nail using 8d (box or common) at 6 inches o.c. or 16d (box or common) at 12
inches o.c.
4. Attachment of 2x lumber ledgers to APA
Performance Rated Rim Board - Use 1/2-inch-diameter lag screws with a minimum nominal
length of 4 inches or 1/2-inch-diameter through-bolts with washers and nuts. In both
cases, use a design value of 350 lbf per fastener if the rim board thickness is 1-1/8
inches or 300 lbf per fastener if the rim board thickness is 1 inch. Caution:
The lag screw should be inserted in a lead hole by turning with a wrench, not by driving
with a hammer. Over-torquing can significantly reduce the lateral resistance of the lag
screw and should therefore be avoided. See the 1997 National Design Specification for Wood
Construction (NDS) published by the American Forest & Paper Association for the
appropriate size of clearance and lead holes.
5. Lateral resistance of nails applied to the faces of APA
Performance Rated RimBoard - Calculate the lateral nail resistance based on the procedures
given in the 1997 NDS and the following guidelines:
a) If the APA Performance Rated RimBoard is made of SOB,
use the bearing strength equivalent to Douglas fir-Larch.
b) If the APA Performance Rated Rim Board is made of
plywood, use the bearing strength equivalent to Douglas fir-Larch.The calculated lateral
resistance should then be adjusted by a factor of 0.9.
c) If the APA Performance Rated Rim Board is made of
glulam, use the wood species of the layup combination.
d) If the APA Performance Rated Rim Board is made of LVL,
use the wood species of the veneer or use the equivalent species published in the
manufacturer's code report.
e) If the product information is unavailable, refer to the
appropriate1997 NDS design values applicable to Spruce-Pine-Fir.
©1998 APA- THE ENGINEERED WOOD ASSOCIATION • ALL RIGHTS RESERVED. • ANY
COPYING, MODIFICATION, DISTRIBUTION OR OTHER USE OF THIS PUBLICATION OTHER THAN AS
EXPRESSLY AUTHORIZED BY PA IS PROHIBITED BY THE U.S. COPYRIGHT LAWS. |
