Bay Window Polymer Roof Specifications

Save time and money when installing a roof on a Bay Window, Bow Window, or other construction projects. 

About Bay
& Bow Windows

Avoid custom roof construction or plywood roof kits. The use of these roofs cut labor and material costs and results in an attractive maintenance free roof.
 
These one piece thermoformed roofs are made from solid color ABS polymers and are UV stable for color retention.
 
The features and benefits of these products include they are, lightweight, strong, have room for insulation, can be used with cable system, have integral molded drip edge, nailing flange, no joints to leak, come with appropriate fasteners and instructions and are available in two colors white and copper tone.
 
Applications can be determined by:

  1. Roofs will fit some window manufacturers, see list.
  2. Roofs can be adapted to window using adapter fastened to top of window.
  3. Many vinyl windows can be custom sized to fit desired roof.
  4. Frame a bay window area into the wall construction using stock window units.

See the list below of the most common sizes of bay window roofs.

Unit number

Length(A)

Projection(B)

Flank(C)

Center(E)

Flank(G)

Jut(J)

Height(H)

30°C 1

71-1/2

13-1/2

25-1/2

26-1/2

25-1/2

1

13-1/2

30°C 2

94

13-7/8

25

49-3/4

25

1

14

45°C1

64-1/2

19

25 ½

27-1/2

25-1/2

1

20

45°C2

88

19-1/2

25-1/2

51-1/2

25-1/2

1

20

A30°3418

85-1/2

13

23

44-1/2

23

1-3/4

13

A45°3418

81-1/2

18

24

46

24

1

19

K30°1820

68

13

23

27-1/2

23

1

12

K30°1828

77-3/4

14

24

35-1/2

24

1-3/4

13

K30°1834

85

14

23-3/4

44

23-3/4

1-3/4

14

K30°1850

105

14

24

63-1/2

24

1-3/4

14

K30° NP 40

94

13-1/4

24

51-1/2

24

1

13

35°CY75

76-1/4

15-1/4

25-1/2

33-1/2

25-1/2

1

18-1/2

Measurements are taken from the inside of the roof so that this is the outside dimension of the window or unit over which the roof will fit. The exception is the height (H) which is from the bottom of the drip edge to the top of the nailing flange. (approximate sizes in inches)