Requirement charts

Find dimension A down the left edge and dimension B across the top; the cell is the number of 8ft tracks.

Both charts are read the same way. Dimension A runs across the joists and dimension B runs along them, as shown in the plan key.

Charts are based on 8ft lengths. Double the amount for 4ft lengths.
Splice and butt joints of deck boards require 1 track on each edge of the joist.

24″ o/c joist spacing
A × B	6'	8'	10'	12'	14'	16'	18'	20'	22'	24'	26'	28'	30'
6'	5	6	7	8	9	10	11	12	13	14	15	16	17
8'	6	7	9	10	11	12	14	15	16	17	19	20	21
10'	7	9	10	12	13	15	16	18	19	21	22	24	25
12'	9	10	12	14	16	17	19	21	23	24	26	28	30
14'	10	12	14	16	18	20	22	24	26	28	30	32	34
16'	11	13	16	18	20	22	25	27	29	31	34	36	38
18'	12	15	17	20	22	25	27	30	32	35	37	40	42
20'	14	16	19	22	25	27	30	33	36	38	41	44	47
22'	15	18	21	24	27	30	33	36	39	42	45	48	51
24'	16	19	23	26	29	32	36	39	42	45	49	52	55
26'	17	21	24	28	31	35	38	42	45	49	52	56	59
28'	19	22	26	30	34	37	41	45	49	52	56	60	64
30'	20	24	28	32	36	40	44	48	52	56	60	64	68

16″ o/c joist spacing
A × B	6'	8'	10'	12'	14'	16'	18'	20'	22'	24'	26'	28'	30'
5' 4"	6	7	8	9	11	12	13	14	16	17	18	19	21
6' 8"	7	8	10	11	13	14	16	17	19	20	22	23	25
8'	8	9	11	13	15	16	18	20	22	23	25	27	29
9' 4"	9	11	13	15	17	19	21	23	25	27	29	31	33
10' 8"	10	12	14	17	19	21	23	26	28	30	32	35	37
12'	11	13	16	18	21	23	26	28	31	33	36	38	41
13' 4"	12	15	18	20	23	26	29	31	34	37	40	42	45
14' 8"	13	16	19	22	25	28	31	34	37	40	43	46	49
16'	14	17	21	24	27	30	34	37	40	43	47	50	53
17' 4"	15	19	22	26	29	33	36	40	43	47	50	54	57
18' 8"	16	20	24	28	31	35	39	43	46	50	54	58	61
20'	17	21	25	29	33	37	41	45	49	53	57	61	65
21' 4"	19	23	27	31	36	40	44	48	53	57	61	65	70
22' 8"	20	24	29	33	38	42	47	51	56	60	65	69	74
24'	21	25	30	35	40	44	49	54	59	63	68	73	78
25' 4"	22	27	32	37	42	47	52	57	62	67	72	77	82
26' 8"	23	28	33	39	44	49	54	60	65	70	75	81	86
28'	24	29	35	40	46	51	57	62	68	73	79	84	90
29' 4"	25	31	37	42	48	54	60	65	71	77	83	88	94
30' 8"	26	32	38	44	50	56	62	68	74	80	86	92	98
32'	27	33	40	46	52	58	65	71	77	83	90	96	102

A × B	6'	8'	10'	12'	14'	16'	18'	20'	22'	24'	26'	28'	30'
6'	5	6	7	8	9	10	11	12	13	14	15	16	17
8'	6	7	9	10	11	12	14	15	16	17	19	20	21
10'	7	9	10	12	13	15	16	18	19	21	22	24	25
12'	9	10	12	14	16	17	19	21	23	24	26	28	30
14'	10	12	14	16	18	20	22	24	26	28	30	32	34
16'	11	13	16	18	20	22	25	27	29	31	34	36	38
18'	12	15	17	20	22	25	27	30	32	35	37	40	42
20'	14	16	19	22	25	27	30	33	36	38	41	44	47
22'	15	18	21	24	27	30	33	36	39	42	45	48	51
24'	16	19	23	26	29	32	36	39	42	45	49	52	55
26'	17	21	24	28	31	35	38	42	45	49	52	56	59
28'	19	22	26	30	34	37	41	45	49	52	56	60	64
30'	20	24	28	32	36	40	44	48	52	56	60	64	68

A × B	6'	8'	10'	12'	14'	16'	18'	20'	22'	24'	26'	28'	30'
6'	5	6	7	8	9	10	11	12	13	14	15	16	17
8'	6	7	9	10	11	12	14	15	16	17	19	20	21
10'	7	9	10	12	13	15	16	18	19	21	22	24	25
12'	9	10	12	14	16	17	19	21	23	24	26	28	30
14'	10	12	14	16	18	20	22	24	26	28	30	32	34
16'	11	13	16	18	20	22	25	27	29	31	34	36	38
18'	12	15	17	20	22	25	27	30	32	35	37	40	42
20'	14	16	19	22	25	27	30	33	36	38	41	44	47
22'	15	18	21	24	27	30	33	36	39	42	45	48	51
24'	16	19	23	26	29	32	36	39	42	45	49	52	55
26'	17	21	24	28	31	35	38	42	45	49	52	56	59
28'	19	22	26	30	34	37	41	45	49	52	56	60	64
30'	20	24	28	32	36	40	44	48	52	56	60	64	68

Related pages

A × B	6'	8'	10'	12'	14'	16'	18'	20'	22'	24'	26'	28'	30'
6'	5	6	7	8	9	10	11	12	13	14	15	16	17
8'	6	7	9	10	11	12	14	15	16	17	19	20	21
10'	7	9	10	12	13	15	16	18	19	21	22	24	25
12'	9	10	12	14	16	17	19	21	23	24	26	28	30
14'	10	12	14	16	18	20	22	24	26	28	30	32	34
16'	11	13	16	18	20	22	25	27	29	31	34	36	38
18'	12	15	17	20	22	25	27	30	32	35	37	40	42
20'	14	16	19	22	25	27	30	33	36	38	41	44	47
22'	15	18	21	24	27	30	33	36	39	42	45	48	51
24'	16	19	23	26	29	32	36	39	42	45	49	52	55
26'	17	21	24	28	31	35	38	42	45	49	52	56	59
28'	19	22	26	30	34	37	41	45	49	52	56	60	64
30'	20	24	28	32	36	40	44	48	52	56	60	64	68