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How to form exterior cip concrete stair with radius

How to form exterior cip concrete stair with radius

How to form exterior cip concrete stair with radius

(OP)
Gents-

I have a client who wants to install a cast-in-place concrete stair on grade on the exterior of a new restaurant addition.  In plan, the stair is about 45 feet long, about 6' wide, and the nosing of each tread is to be formed in an arc with about a 42 foot radius.  Its unusual.

Is it feasible to form stair treads in the field with such a radius?  

RE: How to form exterior cip concrete stair with radius

Yes, experienced formwork carpenters can work wonders with plyform. The problem is to find the carpenters with that experience level & to pay the price.

RE: How to form exterior cip concrete stair with radius

I have used Azek material in the past to form stairs like that, that were wider than 8'.  Makes a nice smooth finish with easy release from the concrete.

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