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INSTALLATION ON ROOFS AND SPAN CHARTS


Gravity Load Resistance

 
Random Length Continuous Layup
This system is the strongest and most economical design lay up. A random length continuous lay up is applied over three or more spans. Each individual plank must bear on at least one supporting member. All joints shall be end matched and all planks shall be nailed together within one foot of each side of the end joint. End joints in adjacent planks shall be at least two feet apart, and end joints in alternate planks shall shall be more than one foot apart when measured along the span of the decking. Eliminate end joints in 1/3 of the end span course.

Span Table ...here

Layup Description ...here

(Click on Decking Images for Span Tables)
Simple Span Layup
This lay up requires specified length decking and provides shorter spans than the random length system.

Span Table ...here

Two Span Continuous Layup
Each continuous unit is made up of decking bearing on three equally spaced supports. (Maximum space is 12'). The end joints between pieces, when of more than a single span unit, are in line over every other support. Continuity reduces deflection so that this arrangement of decking provides the stiffest deck of all.

Span Table ... here

 

Gravity Load Design Equations ... Click here (.pdf format)

 

Lateral Load Resistance (Use in Diaphragms) ... (Under Development) ... Click ... here

 

 
SPECIFICATIONS
 
Face Grades:
Decorative (a selected tight knotted
Hi-line #2 & #3 common)
Industrial (a #3 common with some knot holes allowed)

Species:
Douglas Fir/Larch, Ponderosa Pine, and Inland Red Cedar.

Size:
2" x 6" nominal (actual size 1 7/16" x 5" net)
Also available in 8" width nominal (6 3/4" net)
3" x 6" nominal (actual size 2 3/16" x 5 1/4" net)
Also available in 8" width nominal (7" net)
4" x 6" nominal (actual size 2 7/8" x 5 1/4" net)
Also available in 8" width nominal (7" net) 
5" x 6" nominal (actual size 3 21/32" x 5 1/4" net)
Also available in 8" width nominal (7" net)

Lengths:
Random 6'-16' and longer or specified lengths up to 24'.

Pattern:
CM - EM - EV1S. Center matched, end matched, edge vee one side.
(Square edge, channel groove, or bull nose edges also available as a special run.)

Moisture Content:
10-12%, maximum 15%.

Adhesives:
Fully exterior, structural phenolic resorcinol (faces), and melamine (finger-joints) comply with ASTM D2559.

Quality Control:
Lumber is graded under American Softwood Lumber Standard grading provisions. Glue line certification complies with ASTM D205 and AITC 200.92. Grading and laminating are certified by the Western Wood Products Association, under the National Evaluation Service Committee Report NER - QA 220.

Ends:
End-matching is standard on all orders unless
otherwise specified. Square ends and end matching is available up to 24'.

 

CSI FORMAT SPECIFICATION

Click here (.pdf format)
     

Fastening and Nailing Schedule:
Decking to support members (each piece each crossing):

2" Deck - (2) 12d common or ring shank

3" Deck - (2) 20d common or ring shank

4" Deck - (2) 60d common or ring shank (pre-drilled holes)

5" Deck - (2) 60d common or ring shank (pre-drilled holes)

Course-to-course (slant nail every 30" and within 12" of end joint; alternate courses offset 15");

2" Deck - not required

3" Deck - 8d

4" Deck - 10d

5" Deck - 16d