Image of yellow and grey I 15-60 structural fiberglass stair tread.

I 15-60 PROGrate® Pultruded Stair Tread

12" x 144" Panel | 60% Open | I Bearing Bar
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Product Description Part Number Resin Color Length Location Pieces  

I 15-60

1 1/2″ deep I-beam w/60% open area

Span
(inches)

250 lb

500 lb

Max lb

18

0.02

0.03

12187

24

0.03

0.05

11424

30

0.04

0.07

10256

36

0.06

0.11

8157

42

0.08

0.16

7010

Deflection values are based on concentrated loads of 250 lb and 500 lb applied at the center of span. Span and deflection values are in inches. Max lb represents maximum experimental failure load.

Technical illustration of PROGrate FRP pultruded stair tread, I 15-60.