Class Ii Plyform Safe Span Table Continuous Over 4 or More Spans
Coastal produces concrete form as defined in US Product Standard PS1-09 for Construction and Industrial Plywood. We produce BB Grade Oiled and Edge-Sealed (BBOES) Plyform Class 1 made with 100% Group 1 Southern Yellow Pine veneers. Our BB Plyform is fully sanded on both sides and factory treated with a high quality release agent. Also it is edge-sealed to protect it from water absorption while the concrete is curing. The glue bond classification of our Plyform panels is Exterior.
Note: We highly recommend that Plyform be used as soon as possible after manufacture since the release agent becomes less effective over time. The number of times a piece of Plyform may be re-used usually increases with the "freshness" of the release agent.
Download Concrete Form Spec Sheet 
| Production Item | Performance Category | #Plys | Pcs/Unit | Construction Layup | Notes |
| BB Grade Class 1, Exterior | 19/32 23/32 | 5 5 | 56 46 | B face, B back C or better inner plies | Oiled & Edge-sealed |
RECOMMENDED MAXIMUM PRESSURES ON PLYFORM CLASS I (psf) (a) (c)
FACE GRAIN ACROSS SUPPORTS (b)
| Support Spacing (in.) | Plywood Performance Category | Plywood Performance Category | Plywood Performance Category | Plywood Performance Category |
| 19/32 | 19/32 | 23/32 | 23/32 | |
| 4 | 3110 | 3110 | 4010 | 4010 |
| 8 | 1195 | 1195 | 1540 | 1540 |
| 12 | 540 | 540 | 695 | 695 |
| 16 | 245 | 305 | 345 | 390 |
| 20 | 145 | 190 | 210 | 270 |
| 24 | – | 100 | 110 | 145 |
| 32 | – | – | – | – |
(a) Deflection limited to 1/360th of the span, 1/270th where shaded.
(b) Plywood continuous across two or more spans.
(c) ACI recommends a minimum lateral design pressure of 600 Cw but it need not exceed p=wh.
RECOMMENDED MAXIMUM PRESSURES ON PLYFORM CLASS I (psf) (a) (c)
FACE GRAIN PARALLEL TO SUPPORTS (b)
| Support Spacing (in.) | Plywood Performance Category | Plywood Performance Category | Plywood Performance Category | Plywood Performance Category |
| 19/32 | 19/32 | 23/32 | 23/32 | |
| 4 | 1620 | 1620 | 2170 | 2170 |
| 8 | 530 | 530 | 835 | 835 |
| 12 | 165 | 225 | 375 | 400 |
| 16 | – | – | 160 | 215 |
| 20 | – | – | 115 | 125 |
| 24 | – | – | – | – |
(a) Deflection limited to 1/360th of the span, 1/270th where shaded.
(b) Plywood continuous across two or more spans.
(c) ACI recommends a minimum lateral design pressure of 600 Cw but it need not exceed p=wh.
RECOMMENDED MAXIMUM PRESSURES ON STRUCTURAL I PLYFORM (psf) (a) (c)
FACE GRAIN ACROSS SUPPORTS (b)
| Support Spacing (in.) | Plywood Performance Category | Plywood Performance Category | Plywood Performance Category | Plywood Performance Category |
| 19/32 | 19/32 | 23/32 | 23/32 | |
| 4 | 4110 | 4110 | 5005 | 5005 |
| 8 | 1225 | 1225 | 1590 | 1590 |
| 12 | 545 | 545 | 705 | 705 |
| 16 | 245 | 305 | 350 | 400 |
| 20 | 145 | 190 | 210 | 275 |
| 24 | – | 100 | 110 | 150 |
| 32 | – | – | – | – |
(a) Deflection limited to 1/360th of the span, 1/270th where shaded.
(b) Plywood continuous across two or more spans.
(c) ACI recommends a minimum lateral design pressure of 600 Cw but it need not exceed p=wh.
RECOMMENDED MAXIMUM PRESSURES ON STRUCTURAL 1 PLYFORM (psf) (a) (c)
FACE GRAIN PARALLEL TO SUPPORTS (b)
| Support Spacing (in.) | Plywood Performance Category | Plywood Performance Category | Plywood Performance Category | Plywood Performance Category |
| 19/32 | 19/32 | 23/32 | 23/32 | |
| 4 | 2300 | 2300 | 3095 | 3095 |
| 8 | 640 | 720 | 1190 | 1190 |
| 12 | 195 | 260 | 440 | 545 |
| 16 | – | 110 | 190 | 255 |
| 20 | – | – | 135 | 170 |
| 24 | – | – | – | – |
(a) Deflection limited to 1/360th of the span, 1/270th where shaded.
(b) Plywood continuous across two or more spans.
(c) ACI recommends a minimum lateral design pressure of 600 Cw but it need not exceed p=wh.
SECTION PROPERTIES FOR PLYFORM CLASS 1 AND STRUCTURAL 1 PLYFORM (a)
| | |||||||
| Plywood Performance Category | Approx. Weight (psf) | Moment of Inertia 1 (in. 3/ft) | Effective Section Modulus KS (in. 2/ft) | Rolling Shear Constant lb/Q (in. 2/ft) | 'Moment of Inertia 1 (in. 3/ft) | Effective Section Modulus KS (in. 2/ft) | Rolling Shear Constant lb/Q (in. 2/ft) |
| CLASS 1 | |||||||
| 19/32 | 1.7 | 0.115 | 0.335 | 5.438 | 0.029 | 0.146 | 2.834 |
| 23/32 | 2.1 | 0.18 | 0.43 | 7.009 | 0.072 | 0.247 | 3.798 |
| STRUCTURAL 1 | |||||||
| 19/32 | 1.7 | 0.116 | 0.338 | 5.018 | 0.034 | 0.199 | 2.811 |
| 23/32 | 2.1 | 0.183 | 0.439 | 6.109 | 0.085 | 0.338 | 3.78 |
(a) The section properties presented here are specifically for Plyform, with its special layup restrictions.
CONCRETE PRESSURES FOR COLUMN AND WALL FORMS
| Pressures of Vibrated Concrete (a)(b)(c) | ||||||
| 50oF | 70oF | |||||
| Walls | Walls | |||||
| Pour Rate (ft/hr) | Columns | To 14′ | 15′ and Over | Columns | To 14′ | 15′ and Over |
| 1 | 600 | 600 | 1070 | 600 | 600 | 810 |
| 2 | 600 | 600 | 1130 | 600 | 600 | 850 |
| 3 | 690 | 690 | 1190 | 600 | 600 | 890 |
| 4 | 870 | 870 | 1240 | 660 | 660 | 930 |
| 5 | 1050 | 1050 | 1300 | 790 | 720 | 970 |
| 6 | 1230 | 1230 | 1350 | 920 | 920 | 1010 |
| 7 | 1410 | 1410 | 1410 | 1050 | 1050 | 1050 |
| 8 | 1590 | 1470 | 1470 | 1180 | 1090 | 1090 |
| 9 | 1770 | 1520 | 1520 | 1310 | 1130 | 1130 |
| 10 | 1950 | 1580 | 1580 | 1440 | 1170 | 1170 |
(a) Maximum Pressures need not exceed wh, where w is the unit weight of concrete (lb/ft3), and h is maximum height of pour in feet.
(b) Based on Types I and III cement concrete with density of 150 pcf and 7 inch maximum slump, without additives, and a vibration depth of 4 feet or less.
(c) See pages 17 and 18 of the APA Concrete Forming Guide for additional information on concrete pressures.
See our Policies page for safety and warranty information.
Source: https://coastalplywood.com/concrete-form/
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