Concrete Form Coastal produces concrete form as defined in US Product Standard PS1-07 for Construction and Industrial Plywood. We produce B-B Grade Oiled and Edge-Sealed (BBOES) Plyform Class 1 made with 100% Group 1 Southern Yellow Pine veneers. Our B-B 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.
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.
Production Item
Thickness
#Plys
Pcs/Unit
Construction Layup
Notes
Picture
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 Thickness (in.)
Plywood Thickness (in.)
Plwood Thickness (in.)
Plwood Thickness (in.)
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 Thickness (in.)
Plywood Thickness (in.)
Plwood Thickness (in.)
Plwood Thickness (in.)
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 Thickness (in.)
Plywood Thickness (in.)
Plwood Thickness (in.)
Plwood Thickness (in.)
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 Thickness (in.)
Plywood Thickness (in.)
Plwood Thickness (in.)
Plwood Thickness (in.)
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
Thickness (in.)
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.
