Strapping the underside of trusses

Interior · Ceilings · printed page 357 (PDF page 358)

Book index entries

Roof – Strapping the Underside Strapping the Underside of Roof Trusses Trusses – Strapping the Underside Interior Ceilings

Text in the illustration

(e.g. 1x3s or 2x2s) perpendicular
A
common practice - drywall attached directly to trusses on 24" centers can cause drywall sagging
B
better practice - install strapping (e.g. 1x3s or 2x2s) perpendicular to trusses every 16"
trusses
sagging drywall
drywall applied to strapping
note:
some builders use 5/8" drywall instead of strapping to help reduce sagging while others use both methods
front view
side view

Generated explanation

The illustration compares two ceiling attachment methods beneath wood roof trusses, with front and side views of each. In arrangement A, drywall is attached directly to trusses spaced 24 inches on center, and the side view shows sagging between supports. Arrangement B adds strapping perpendicular to the truss bottom chords every 16 inches, with drywall attached to the strapping and shown flat. The strapping is identified as 1x3s or 2x2s and described as better practice. A note states that some builders use 5/8-inch drywall to reduce sagging instead of strapping, while others use both methods.

Related illustrations

0435

Sagging drywall ceilings

· p. 80

The illustration compares two ceiling-support arrangements beneath wood roof trusses in front and side views. Arrangement A shows drywall attached directly to trusses spaced 24 inches on center, with the side view depict