How to Install Treads and a Landing Pad on L-Shaped Stairs

Begin by using a pry bar and a chisel to carefully detach the existing stair treads from the staircase structure. Work from the edge, gently loosening the treads. For stubborn treads, you may need to tap the chisel with a hammer. Once the treads are loose, remove them. Next, tackle the risers by prying them away from the treads and stringers. Be mindful of any nails or fasteners that may be present and remove them as you go. Ensure you are wearing safety glasses to protect your eyes from flying debris and gloves for grip and protection.

Once the old treads and risers are removed, thoroughly clean the exposed stair stringers and subfloor. Use a stiff brush or broom to sweep away all dust, debris, and old adhesive. Inspect the subfloor for any damage, such as rot, cracks, or soft spots. Repair any damaged areas using wood filler for minor imperfections or by cutting out and replacing severely damaged sections with new plywood or OSB. Ensure that all surfaces are flat and free of obstructions. If any stringers appear weak or damaged, reinforce them or replace as necessary before proceeding.

Using a tape measure, accurately measure the width and depth of each stair tread. For an L-shaped stair, also measure the dimensions of the landing pad area. Account for any existing nosing or overhang you wish to replicate or modify. Transfer these measurements to your new tread material (e.g., hardwood, laminate). Use a chalk line or pencil to mark your cut lines. Employ a circular saw or miter saw for straight, precise cuts. For treads that need a profile or return, ensure these are accounted for in your cutting strategy. Cut the new treads and the landing pad piece to size.

Begin by dry-fitting each new tread and the landing pad to ensure a perfect fit. Make any necessary adjustments. Apply a generous bead of construction adhesive along the front and back edges of the stair stringer and subfloor where the tread will sit. Also, apply adhesive to the underside of the tread where it will contact the subfloor. Carefully place the tread onto the stringers, aligning it properly. Secure the tread by driving wood screws through the tread and into the subfloor and stringers below. Predrill pilot holes to prevent splitting, especially near the edges. For risers, if you are installing them, use construction adhesive and nails. Repeat this process for all treads and the landing pad, working from bottom to top.

If your stair renovation includes new risers, install them now. Apply construction adhesive to the back of the riser and the front edge of the tread it will attach to. Position the riser, ensuring it's flush and square, and secure it with nails or screws through the back into the tread and/or through the front into the riser below. For any exposed screw or nail heads on treads or risers, fill them with wood filler and allow it to dry. Once the filler is dry, sand down any rough spots or edges on the treads and landing pad to ensure a smooth finish. If you are painting or staining the treads and risers, apply your chosen finish according to the manufacturer's instructions. If using a natural wood finish, apply a protective sealant or varnish.