Stair Risers

Another product brought to you by Kerfkore Company.

Stair Risers are constructed with a hardboard face suitable for painting applications. It is also available with different veneer face options. The riser is designed for use on starting step applications where a bull nosed end is desired to provide a platform to mount the tread and banister railing.

Stair Risers are available in an 8" height with bendable end/ends to form the needed radius. The height can be reduced by edging on a table saw to a smaller width if needed. The product is shipped flat and by the use of a shaping rib can be bent and shaped into the desired form.

Stair Risers are designed to form a maximum diameter of 13" or it can be bent down to an 8" diameter if needed. This diameter is determined by the size of the bull nose needed for the particular application. The standard riser comes in an 8" wide (step height) so that it can be ripped down to match the needed step height.

Stair Risers are formed into the desired contour by the use of a curved forming rib. This rib should be machined to the correct shape and the riser then applied to this rib. Sometimes the use of a dado or rabbet is used to locate this rib for attachment. The rib should be glued, clamped and possibly pin nailed into place until dry.

Stair Risers are available in an economical paint grade and a variety of veneers including red oak, maple, pine and other specified veneers. Stair Risers are available in single or double nosed with different length options. A variety of substrates can be used as the core product such as plywood, particleboard and MDF.

The Stair Riser will consist of a rigid center section joined to the bendable Kerfkore on one or both ends. This allows for the riser to be shipped flat and then formed into the desired end radius by the use of a shaping rib. The product can create a diameter from 8" up to 13" without any telegraphing as found with other conventional bull nosed methods. Core materials of particleboard and plywood are available. Custom sizes made to customer specifications are available for reasonable quantities.


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“Prior to using pre-kerfed substrates provided by Interior Products Inc., we painstakingly saw-kerfed plywood panels manually for use in radius millwork applications. Interior Products flexible substrates have cut our skilled labor costs dramatically. The variety of materials supplied by Interior Products (Kerfkore, Timberflex, Flexboard and Ultralite) lends itself to numerous applications and options: panels, doors, curtain walls, mouldings and traditional curved millwork. We can use Interior Products in applications where the weight of plywood panels would be impractical.

Using Kerfkore we can create inlays in flat panels, then bend the panel. Applying inlays to already curved surfaces is tedious, if not impossible. Designers and architects have been delighted with the creative flexibility we can offer them.

During the construction of millwork at Nationwide Arena, Columbus (Ohio) new NHL hockey arena, the designers came to us with a fabrication problem. The original design for a concession area included a steel channel in an elliptical shape suspended from the arena's ceiling. When the structural engineers reviewed the plans, they objected to the fixtures the weight was too great to be properly supported. The design team asked us to find a solution. We used Timberflex to create a curved ceiling fixture painted to mimic the steel channel. Even the steel fabricators were fooled, and the fixture was incredibly light. Interior Products gives us options that we never had before.”
Dean Hafey, Dean's Custom Fixtures (Columbus, OH)