20 psf live · 10 psf dead · L/240
Ceiling Joists — 20 psf Live Load (Limited Attic Storage)
Ceiling joists for attics with limited storage. Covers Douglas Fir-Larch and Hem-Fir per the published source table. A blank cell means the span exceeds the maximum shown in the source table for that size.
Source: International Residential Code (IRC), 2018 — Table R802.5.1(2) — Ceiling Joist Spans, 20 psf Live Load (limited attic storage). Published by International Code Council.
| Spacing | Species & grade | 2x4 | 2x6 | 2x8 | 2x10 |
|---|---|---|---|---|---|
| 12″ o.c. | Douglas Fir-Larch · SS | 10′-5″ | 16′-4″ | 21′-7″ | — |
| 12″ o.c. | Douglas Fir-Larch · #1 | 10′-0″ | 15′-9″ | 20′-1″ | 24′-6″ |
| 12″ o.c. | Douglas Fir-Larch · #2 | 9′-10″ | 15′-0″ | 19′-1″ | 23′-3″ |
| 12″ o.c. | Douglas Fir-Larch · #3 | 7′-10″ | 11′-6″ | 14′-7″ | 17′-9″ |
| 12″ o.c. | Hem-Fir · SS | 9′-10″ | 15′-6″ | 20′-5″ | — |
| 12″ o.c. | Hem-Fir · #1 | 9′-8″ | 15′-2″ | 19′-10″ | 24′-3″ |
| 12″ o.c. | Hem-Fir · #2 | 9′-2″ | 14′-5″ | 18′-6″ | 22′-7″ |
| 12″ o.c. | Hem-Fir · #3 | 7′-8″ | 11′-2″ | 14′-2″ | 17′-4″ |
| 16″ o.c. | Douglas Fir-Larch · SS | 9′-6″ | 14′-11″ | 19′-7″ | 25′-0″ |
| 16″ o.c. | Douglas Fir-Larch · #1 | 9′-1″ | 13′-9″ | 17′-5″ | 21′-3″ |
| 16″ o.c. | Douglas Fir-Larch · #2 | 8′-11″ | 13′-0″ | 16′-6″ | 20′-2″ |
| 16″ o.c. | Douglas Fir-Larch · #3 | 6′-10″ | 9′-11″ | 12′-7″ | 15′-5″ |
| 16″ o.c. | Hem-Fir · SS | 8′-11″ | 14′-1″ | 18′-6″ | 23′-8″ |
| 16″ o.c. | Hem-Fir · #1 | 8′-9″ | 13′-7″ | 17′-2″ | 21′-0″ |
| 16″ o.c. | Hem-Fir · #2 | 8′-4″ | 12′-8″ | 16′-0″ | 19′-7″ |
| 16″ o.c. | Hem-Fir · #3 | 6′-8″ | 9′-8″ | 12′-4″ | 15′-0″ |
| 19.2″ o.c. | Douglas Fir-Larch · SS | 8′-11″ | 14′-0″ | 18′-5″ | 23′-7″ |
| 19.2″ o.c. | Douglas Fir-Larch · #1 | 8′-7″ | 12′-6″ | 15′-10″ | 19′-5″ |
| 19.2″ o.c. | Douglas Fir-Larch · #2 | 8′-2″ | 11′-11″ | 15′-1″ | 18′-5″ |
| 19.2″ o.c. | Douglas Fir-Larch · #3 | 6′-2″ | 9′-1″ | 11′-6″ | 14′-1″ |
| 19.2″ o.c. | Hem-Fir · SS | 8′-5″ | 13′-3″ | 17′-5″ | 22′-3″ |
| 19.2″ o.c. | Hem-Fir · #1 | 8′-3″ | 12′-4″ | 15′-8″ | 19′-2″ |
| 19.2″ o.c. | Hem-Fir · #2 | 7′-10″ | 11′-7″ | 14′-8″ | 17′-10″ |
| 19.2″ o.c. | Hem-Fir · #3 | 6′-1″ | 8′-10″ | 11′-3″ | 13′-8″ |
| 24″ o.c. | Douglas Fir-Larch · SS | 8′-3″ | 13′-0″ | 17′-2″ | 21′-3″ |
| 24″ o.c. | Douglas Fir-Larch · #1 | 7′-8″ | 11′-2″ | 14′-2″ | 17′-4″ |
| 24″ o.c. | Douglas Fir-Larch · #2 | 7′-3″ | 10′-8″ | 13′-6″ | 16′-5″ |
| 24″ o.c. | Douglas Fir-Larch · #3 | 5′-7″ | 8′-1″ | 10′-3″ | 12′-7″ |
| 24″ o.c. | Hem-Fir · SS | 7′-10″ | 12′-3″ | 16′-2″ | 20′-6″ |
| 24″ o.c. | Hem-Fir · #1 | 7′-7″ | 11′-1″ | 14′-0″ | 17′-1″ |
| 24″ o.c. | Hem-Fir · #2 | 7′-1″ | 10′-4″ | 13′-1″ | 16′-0″ |
| 24″ o.c. | Hem-Fir · #3 | 5′-5″ | 7′-11″ | 10′-0″ | 12′-3″ |
Per-combination pages
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2x4 Douglas Fir-Larch · 12″ o.c.2x4 Douglas Fir-Larch · 16″ o.c.2x4 Douglas Fir-Larch · 19.2″ o.c.2x4 Douglas Fir-Larch · 24″ o.c.2x6 Douglas Fir-Larch · 12″ o.c.2x6 Douglas Fir-Larch · 16″ o.c.2x6 Douglas Fir-Larch · 19.2″ o.c.2x6 Douglas Fir-Larch · 24″ o.c.2x8 Douglas Fir-Larch · 12″ o.c.2x8 Douglas Fir-Larch · 16″ o.c.2x8 Douglas Fir-Larch · 19.2″ o.c.2x8 Douglas Fir-Larch · 24″ o.c.2x10 Douglas Fir-Larch · 12″ o.c.2x10 Douglas Fir-Larch · 16″ o.c.2x10 Douglas Fir-Larch · 19.2″ o.c.2x10 Douglas Fir-Larch · 24″ o.c.2x4 Hem-Fir · 12″ o.c.2x4 Hem-Fir · 16″ o.c.2x4 Hem-Fir · 19.2″ o.c.2x4 Hem-Fir · 24″ o.c.2x6 Hem-Fir · 12″ o.c.2x6 Hem-Fir · 16″ o.c.2x6 Hem-Fir · 19.2″ o.c.2x6 Hem-Fir · 24″ o.c.2x8 Hem-Fir · 12″ o.c.2x8 Hem-Fir · 16″ o.c.2x8 Hem-Fir · 19.2″ o.c.2x8 Hem-Fir · 24″ o.c.2x10 Hem-Fir · 12″ o.c.2x10 Hem-Fir · 16″ o.c.2x10 Hem-Fir · 19.2″ o.c.2x10 Hem-Fir · 24″ o.c.