We are a constantly expanding and evolving company and have been around since 1995. A core part of our business has been replacing poorly built stairs with our quality built long lasting staircases. The key problem we find as that others use lag bolts or metal through rods or some other metal fasteners to hold the stair treads on. Metal and wood just don't work together over time. The metal fasteners under daily use loosen, and then fail. It's an elementary way to build stairs.
Metal & Wood in Staircases Sometimes Don't Mix
When we were asked to first make stairs, the home builder told me to put them together with lag bolts but leave the wood plugs off so they could tighten up the bolts for the next three years. This was from a very prominent log home builder and I still see people building this way today. If someone tells you that they attach your treads with anything metal, RUN-AWAY. Wood works best and lasts the longest with good glue and good joinery engineering.
Our Wood and Drying Process
Our glue boasts a 7000 pounds per square inch gripping strength, so on a typical tread on our spiral stair we would have 840,000 pounds of gripping strength. This is not your typical glue - it's not even manufactured in North America and it's not cheap - but we think it's the best choice to use. Our Wood is slowly-dried white pine from Northern Ontario. Slowly dried means the water is removed evenly so there should be little if any shrinkage once at the job site, Slow growth means the rings are close together, making the wood very strong.
Our Joinery Technology is Unique in Stair Building Industry
Finally, with our joinery technology for our spiral stairs, we first drill into our center post at a 4 degree angle; which is similar to a branch angle. This gives us good leverage for our treads. We never cut into the sides of the center posts to notch in the treads because this outer wood is the strong ridged wood that the stair tread needs to for support. If you chip into this outer layer all you will have left is the inner, soft, spongy wood which has little support and over time will start to loosen and fail.
So in a nutshell, sound materials and sound craftsmanship give you a fantastic, long lasting product. In our company we always strive to do better and I hope this information brings you a good reference for a good choice in choosing your stair builder.