Installing a stair skirtboard after the treads and risers are already in place is one of those remodeling challenges that separates experienced carpenters from the rest. Normally, skirtboards slide in between the stair stringer and the wall before the treads and risers go in. But when you are working on a renovation or a retrofit, you often face the opposite situation: the stairs are complete, and you need to fit the skirtboard around every tread and riser with precision. This is where skirtboard scribing and paper template techniques become essential. The method described in this article uses nothing more than printer paper, tape, scissors, and a chalkline to produce a perfect fit, even on stairs with inconsistent framing or crooked lines.
Understanding the Skirtboard and Why Scribing Matters
A skirtboard is a piece of trim that runs along the wall side of a staircase, covering the gap between the wall and the treads and risers. It serves both a functional and an aesthetic purpose. Functionally, it protects the wall from scuffs and damage. Aesthetically, it provides a finished transition between the stair structure and the wall surface.
In new construction, the skirtboard is typically installed before the treads and risers. The carpenter cuts the board to length, notches it to fit around each tread and riser, and fastens it to the stringer. The treads and risers then butt against the skirtboard, creating a clean joint.
In remodeling work, the sequence is reversed. The treads and risers are already fastened in place, and you must fit the skirtboard around their contours. This is where scribing comes in. Scribing is the technique of transferring an irregular surface profile onto a workpiece so you can cut it to match exactly. When done correctly, the skirtboard fits so tightly against the stair profile that the joint line is barely visible.
Materials and Tools for the Paper Template Method
Before you begin, gather the materials and tools needed for the scribing process. The beauty of this method is that it requires nothing specialized. Most of the items are already in your shop or office.
Materials List
| Item | Quantity | Purpose |
|---|---|---|
| Standard printer paper (8.5 x 11 inches) | 15 to 20 sheets | Template material |
| Masking tape or painter’s tape | 1 roll | Joining paper sheets |
| Scissors | 1 pair | Cutting paper templates |
| Chalkline | 1 | Establishing top edge of skirtboard |
| Pencil | 1 | Tracing pattern onto stock |
| Skirtboard stock (1×10 or similar) | As needed | Final workpiece |
| Jigsaw or coping saw | 1 | Cutting the skirtboard profile |
Selecting the Right Stock
Skirtboard stock is typically a 1×10 or 1×12 board, depending on the height of the stair stringer. Choose a board that is straight, free of large knots, and has minimal cupping. Primed MDF or solid lumber both work well, but solid lumber holds up better in high-traffic stairways where the skirtboard may take occasional impacts.
If you are working with painted trim, primed MDF is an economical choice that takes paint well and resists warping. For stained applications, select clear-grade lumber such as poplar, oak, or pine, matching the species to the rest of the stair trim.
Step-by-Step Scribing Process
The paper template method described by Forrest McCanless in Fine Homebuilding magazine is a clever solution for fitting skirtboards to existing stairs. The process breaks down into several clear steps.
Step 1: Snap a Diagonal Chalkline
Start by establishing the top edge of the skirtboard. Measure down from the top tread at the wall and make a mark at the desired height of the skirtboard. The standard height is usually the width of the board minus the reveal you want above each tread. Make a corresponding mark at the bottom of the stair run. Snap a chalkline between these two marks. This line represents the top edge of the skirtboard and establishes the angle of the stair run.
Step 2: Build the Paper Template
Working from the top of the stairs downward, cut pieces of printer paper to fit each triangular space between the tread edge, the riser face, and the snapped chalkline. Here is the procedure:
- Hold a sheet of paper against the first tread and riser at the top of the stair.
- Crease or cut the paper along the chalkline so it matches the angle.
- Cut around the bullnose curve of the tread using scissors. The bullnose is the rounded front edge of the tread.
- Where risers are not perfectly plumb, taper the paper cut to match the lean of the riser.
- Tape the first piece in place, then move to the next tread and repeat.
- Continue down the entire flight, taping each new piece to the previous one.
As you work, save the triangular offcut pieces from each sheet. These offcuts are useful for reinforcing the narrow sections of the pattern, especially where the skirtboard width tapers near the top or bottom of the run.
Step 3: Remove and Transfer the Pattern
Once you have covered the full length of the stair run, carefully peel the assembled paper pattern off the wall. It will be a long, connected strip that mirrors the exact profile of the stairs, complete with every tread, riser, bullnose curve, and any irregularities in the framing.
Lay the pattern onto your skirtboard stock. Align the long edge of the pattern with the straight edge of the board. Tape the pattern in place so it does not shift during tracing. Use a sharp pencil to trace the outline onto the wood. Mark every corner and curve carefully.
Step 4: Cut and Test the Fit
Cut the skirtboard along the traced line using a jigsaw or coping saw. For tight inside corners where the tread meets the riser, a coping saw or sharp chisel gives you the control you need. After cutting, take the skirtboard to the stairs and test the fit. The paper pattern method typically produces a fit that requires minimal adjustment. If any spots are tight, mark them with a pencil and trim with a block plane or sandpaper.
For more details on achieving a professional fit, see our guide on splitting angles for stair skirtboard to baseboard transitions, which covers how to handle the junction where the skirtboard meets baseboard trim at the top and bottom of the stair run.
Handling Common Challenges with Stair Skirtboard Scribing
Even with a well-made paper template, stair remodeling work throws up predictable challenges. Knowing how to handle them in advance saves time and material.
Out-of-Plumb Risers
Older homes and remodels often have risers that are not perfectly vertical. This is especially common in houses that have settled over time. When you encounter an out-of-plumb riser, do not force the paper to conform to an imaginary vertical line. Instead, cut the paper to follow the actual angle of the riser. The paper template method excels at capturing these irregularities because each piece is fitted individually.
Uneven Tread Depths
Not all stair treads are the same depth, particularly in older homes where framing was done by eye rather than by layout. The paper template automatically captures variations in tread depth because each triangular piece is cut to match the actual space. This is a major advantage over measuring and transferring dimensions, which compounds errors.
Bullnose Radius Variations
Tread bullnose profiles can vary significantly between manufacturers and between different eras of construction. Some bullnoses are tight and rounded, while others have a softer, more gradual curve. When cutting the paper around the bullnose, use small snipped cuts to follow the curve accurately. On the final skirtboard, use a drum sander attachment on a drill or a rasp to fine-tune the curve for a perfect match.
Long Skirtboard Runs
A single flight of stairs can produce a pattern 14 feet long or more. Handling a pattern of this length requires care when removing it from the wall and transferring it to the stock. Have an assistant help you peel the pattern off the wall to prevent tearing. When laying it on the stock, use weights or tape to hold it flat. A long, uninterrupted pattern gives you one continuous cutting line, which produces a better result than splicing shorter segments.
For guidance on cutting stair components accurately, see our article on cutting stair treads accurately using tools, techniques, and shop-built solutions, which covers the methods and jigs that complement skirtboard installation work.
Fastening and Finishing the Installed Skirtboard
Once the skirtboard fits properly, the next steps are fastening, filling, and finishing. How you approach these tasks depends on the material of the skirtboard and whether the installation is painted or stained.
Fastening Methods
Skirtboards are typically fastened to the stair stringer, not to the treads or risers. The stringer runs at an angle behind the skirtboard and provides solid anchorage. Use 2-inch finish nails or trim screws driven through the skirtboard into the stringer. Space fasteners every 12 to 16 inches along the length of the board.
- Finish nailer: A 15- or 16-gauge finish nailer with 2-inch nails is the fastest option. Set the nails slightly below the surface with a nail set.
- Trim-head screws: For installations where you want maximum holding power, use 2-inch trim-head screws. Counter-sink them and cover with wood filler.
- Construction adhesive: Apply a bead of construction adhesive to the back of the skirtboard before fastening. This prevents squeaks and adds rigidity.
Filling and Sanding
Fill nail holes and any small gaps at the joints with wood filler or paintable caulk. For painted skirtboards, use a high-quality latex or acrylic caulk at the top edge where the skirtboard meets the wall. For stained work, use a color-matched wax filler or wood putty.
Sand the filled areas with 220-grit sandpaper once the filler is dry. Wipe away dust with a tack cloth before applying primer or stain.
Priming and Painting or Staining
For painted installations, apply one coat of high-quality primer and two coats of satin or semi-gloss paint. Semi-gloss is the standard choice for stair trim because it cleans easily and reflects light in a way that highlights the profile of the skirtboard.
For stained installations, apply the stain according to the manufacturer’s instructions, followed by two coats of polyurethane for durability. Stair trim takes more abuse than wall trim, so a durable topcoat is essential.
For a broader overview of stair design and construction principles, see our complete overview of staircase design, construction, and remodeling, which covers everything from layout to finishing touches.
Conclusion
Scribing a skirtboard to an existing stair using a paper template is a technique every carpenter should have in their toolkit. It requires no expensive tools, no complex calculations, and no fussing with measurements that compound errors. The method works on straight runs, on stairs with inconsistent framing, and on any stair material. The result is a skirtboard that fits as though it was installed before the treads and risers went in, even though the installation sequence was reversed.
The key to success is patience during the template phase. Each piece of paper must be cut and fitted carefully to capture the exact geometry of the stair. Rushing this step produces a sloppy pattern and a poor fit. Take the time to tape each piece securely, cut crisp curves around the bullnoses, and reinforce narrow sections with offcut triangles. The payoff is a skirtboard that installs with minimal adjustment and a joint that looks clean and professional.
When you combine this scribing technique with proper fastening, precise cutting of stair components, and careful transition detailing at the top and bottom of the run, you produce finish work that stands up to close inspection. Whether you are a seasoned carpenter or a dedicated DIY homeowner, the paper template method delivers reliable results on every stair skirtboard installation.