Log Spiral Staircase Installation Guide
Before you begin your installation, check to be sure you have all the parts listed on the packing slip. You should have one log center post for each stairway. The packing slip will specify the number of treads that are manufactured for your log spiral stairway. You also will have one each 12" lags, washers, and wood plugs. We have also included (2) 6" lags, washers, and wood plugs for each post in addition to 4" screws and plugs to secure the railing to the posts.
1) Position the center post so that it reflects the dimensions stated in the CAD drawing, and then rotate the post so that tread placement allows for proper headroom clearance under the floor joist of the landing. To more easily measure headroom, temporarily place a tread in the mortise hole directly under the floor joist.
2) Make sure the center post is square and plumb, and then secure the base of the center post to the floor using appropriate fasteners. We recommend the fabrication of a metal center spur and plate with a spur length at least 4" long. Then boring out the base of the post to set over top of the spur.
3) Once the post is secured, place the tread in the appropriate mortise hole starting with tread labeled 1 at the bottom and working your way up the stairway as the numbers increase. Each tread will fit snugly in the mortise hole but may need to be driven in with a mallet and a board placed on the radius of the tread to keep from damaging it. Don't try to draw in the tread using the lag until it is 1/4" from being in place to insure the wood doesn't strip out. It is also recommended to use construction adhesive to further strengthen the rigidity of the tenon joint.
4) The top tread will need to be trimmed back in order to fit properly with the landing.
5) Use the 12" lags provided to secure all the tread in place.
6) Then mount the posts starting with 1 on the bottom working up the stairway. Use the 6" lags provided to secure the posts to the tread.
7) Place the hand rail on the posts using the existing screw holes as a guide for the rail placement, and trim the top and bottom ends to the desired length.
8) Secure the hand rail to the post using the 4" screws enclosed. Because of the stairway radius, the hand rail will twist slightly when not secured in place. If the handrail is clamped to the post before it is secured, most of the deflection will be eliminated.
9) Place spindles in their appropriate holes, starting with 1 at the bottom and working up the log spiral stairway. The spindles are cut a little long to allow for on site trimming. Secure the bottom of the spindles using desired fasteners.