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Presentation 12:

SILL LAYOUT

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On Center (OC) Concepts

• Framing members are carefully spaced.• This allows 4x8 panels to have support at each

end of each sheet.

Each end is supported

4x8 Panel

Support Members

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OC Concepts

• Typical support member spacing is 16″.

16″ 16″ 16″ 16″ 16″ 16″

8′0″

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OC Concepts

• That is 16″ from center to center.• OR from left edge to left edge.• OR from right edge to right edge.

16″16″

16″

Left to left

Right to right

Center to center

They are the same

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Variations in OC

• Other OC spacing includes 12″, 16″, 19.2″, 24″, and 32″.

8′0″

12″

12″ OC has EIGHT spaces in 8′

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Variations in OC

• Other OC spacing includes 12″, 16″, 19.2″, 24″, and 32″.

8′0″

16″

16″ OC has SIX spaces in 8′.

Remove twoRedistribute evenly

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Variations in OC

• Other OC spacing includes 12″, 16″, 19.2″, 24″, and 32″.

8′0″

19.2″

19.2″ OC has FIVE spaces in 8′.

Remove oneRedistribute evenly

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Variations in OC

• Other OC spacing includes 12″, 16″, 19.2″, 24″, and 32″.

8′0″

24″

24″ OC has FOUR spaces in 8′.

Remove oneRedistribute evenly

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Variations in OC

• Other OC spacing includes 12″, 16″, 19.2″, 24″, and 32″.

8′0″

32″ OC has THREE spaces in 8′.

32″

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15 ¼″

First OC Member

• First OC member must be moved to align with the edge of the 4x8 panel

16″

Move first OC member

Movement is ½ the member thickness

This is typically ¾″.

16″

Edge of the Building

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OC Layout

• Floor joist layout is often done on the sill.

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OC Layout16″

• Typical OC is 16″.• First measure OC

from corner.• Make a mark

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OC Layout

• Measure back ½ the thickness of the joist. 16″

Typically ¾″

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15 ¼″

OC Layout

• Square this line across.

• Place an X on the OC side of line.

16″

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OC Layout

• The edge of the joist will be placed next to the line. 15 ¼″

OC Member

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OC Layout

16″15 ¼″

• Next OC layout mark is measured from the setback line.

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OC Layout

16″15 ¼″

• Remaining OC layout marks are measured from the setback line.

16″

16″

16″

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Layout Across Building

• Layout lines across the building are from the same line.

Sill Girder Sill

Foundation

15 ¼″15

¼″ 15 ¼

″

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Layout Across Building

• X’s are placed on the same side of the line if the joists run full length.

Sill Girder Sill

Foundation

15 ¼″15

¼″

Joist

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Layout Across Building

• Layout is opposite if joists only span to the girder.

Sill Girder Sill

Foundation

15 ¼″15

¼″

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Layout Across Building

• Second set of X’s should be changed so as to reduce confusion during assembly.

Sill Girder Sill

Foundation

15 ¼″15

¼″

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Conclusions

• OC members are spaced to support the panel edges.

• Measuring edge-to-edge is the same as center-to-center.

• First OC member must be moved ½ the joist thickness. Usually ¾″.

• Layout across a building is from the same setback line.