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A contractor was building an addition to a mainline Philadelphia residence. Part of the addition was for a library space on the 2nd floor. The architect had designed a blackened spiral staircase for that area. The clients are well traveled and had inspiration ideas from foreign countries that they wanted incorporated into their spiral stair design.

One concept was for a larger 6” dia center pole, and then to have the wood treads “float” from the center pole to give it more of a modern stair design. A significant challenge with this was how to make the wood treads be 4 sided. We made the top piece of one tread extend to become the bottom part of the next tread. The outside stringer was ¼” plate on edge with no trim, for a very clean and contemporary look. The pickets were then traditional design ½” square solid with classic knuckles. The handrail design was a minimalist 1” round bar. We added an additional handrail on the inside of stair to meet code.

The client had seen a forged knot and tassel detail during their travels that they wanted replicated. To do this forged knot, we started by molding with playdough. Once comfortable with that, we graduated to ½” round bar. Then the ¾” round bar for the final product. For the tassel, we started with 2” round bar hammering it to a pear top shape and upsetting the bottom to create a bell shape. For this we created a custom spring die with a chisel point at the top and bottom. The tassel piece had to be red hot, then it was hammered with a striker and helper to forge the intricate grooves in the tassel.

The next obstacle was that the client desired the entire spiral stair and railing structure to have an antique blackened finish. For context, this spiral stair structure was overall 12 ft high, 6 ft. wide and 6ft deep, thus making this request more challenging. The first step was to blast the entire spiral stair to a white metal. Then, we set it up vertically and sprayed with an oxidizing chemical to blacken the material. After this, the whole structure had to be rubbed down by hand with a scratch pad . Then we placed the stair structure in a large oven and heated it to 150 degrees. We then rubbed renaissance wax  over the entire structure to encapsulate the living finish and complete the porject.

The installation was the final challenge as this piece weighed approximately 800 pounds. It was not possible to get any large equipment into the space, so we attached a winch  to the ceiling to hoist the stair into its vertical position.

 The clients absolutely love their custom crafted spiral stair, and it will be a testimony to their design inspirations in this Philadelphia home for many years to come.

Do you want a custom blackened spiral staircase of your own?! We are happy to help! Contact us here! 

Need more inspiration? Check out our other work on Pinterest, Houzz Or our galleries!

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Thanks to the Compass team. The original work that was done 12 years ago still looks great. Unfortunately, we had to remove the railings to install new pillars this year due to weather related issues with the stones. Compass removed the rails and reinstalled them after the repairs were done. All looks beautiful again.

Thomas Zentz

We were thrilled to work with Compass again on our back porch project! The end result is gorgeous and the process was seem less. In a time characterized by delays, labor shortages and supply chain issues, Compass exceeded our expectations by providing a beautiful product and outstanding service in a timely manner. We look forward to working with Compass again in the future on all our metalwork needs.

Thank you so much again for your help!

Gina Bevan

Compass was very flexible when we changed our design. Quality was so wonderful, and unexpected.
We would never go to anyone else.

Amy Stone

Amos, your team exceeded extremely high expectations. The stairs are the heart and soul of the house, and as the main focal point are a treasure to the owners and architect. Every visit is followed by “come see the stairs”. I know how challenging it was to build and install this masterpiece, having worked as a builder for 50 plus years, and admire how your crew stayed positive and focused throughout. I can’t wait for the next one!

Custom Home Builder~ Northern VA
Front entrance metal gate