Section Contents

 Working with Curved Forms

Concrete Forming HDO Plywood PanelsCurved forms using Plyform were used to form the eleven 55ft. high massive concrete arches in the Washington State History Museum in Tacoma, USA. The guide here refers to the minimum radii to enable Plyform panels to be bent while dry.  Tighter radii can be developed by special selection of panels or by wetting or steaming them.

 Minimum Bending Radii1

Plywood

Performance  Classification

Across

The Grain

Parallel to

The Grain

Equivalent Thickness (mm)

ft

m

ft

m

1/4

5/16

3/8

1/2

 5/8

3/4

6.4

7.9

9.5

12.7

15.9

19.1

2

2

3

6

8

12

0.610

0.610

0.915

1.828

2.438

3.658

5

6

8

12

16

20

1.524

1.828

2.438

3.658

4.877

6.096

Values based on physical properties of non-overlaid Douglas fir