Concrete Form

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

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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)


Properties for Stress Applied Parallel with Face Grain
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.

 


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