Joist & Rafter

Repetitive flat joists or sloped rafters from area loads (psf).

Design diagram — updates live with your inputs

Member & Material

Member type

Material type

Species Sawn lumber only

Grade Sawn lumber only

Standard section

Width b (in)

Depth d (in)

Span (horizontal) (ft) Clear span

Member spacing (in) On center

Roof slope (rafter) (rise:12) Rise per 12 in run; 0 for a flat joist

Dead load (psf)

Floor live load (psf)

Roof snow load (psf) Use for rafters

Load duration Sets CD

Service condition

Temperature

Live defl. limit L/

Total defl. limit L/

Incised lumber Yes

NDS 2018