Buzz
Are there gaps between the steps of your wooden staircase that you wish to seal? While open-style stairs are quite trendy, these gaps can become hazardous if the steps are too high and fail to meet safety standards. However, sealing stair gaps is a straightforward DIY project that can be completed in just a few hours if you’re comfortable with woodworking. With a bit of effort, you can significantly enhance the safety of your staircase.
Steps
Measure and Cut the Wood
Determine the width and height of the gaps behind each step. Go to the back of the staircase and measure the horizontal width of the stair tread using a tape measure. Next, measure from the bottom edge of the tread to the bottom edge of the tread directly above it. Record these measurements to ensure accuracy.
- Avoid measuring from the top edge of the tread, as this might leave insufficient material for proper wood panel installation.
- Since not all gaps are the same size, measure each one individually.
- The height between steps varies depending on your location. For instance, some countries allow a maximum gap of 10 cm, while others permit up to 21 cm. In Vietnam, the typical step height ranges between 15 - 18 cm.
Purchase 2 - 2.5 cm thick plywood to seal the gaps. You can use any type of wood for the risers. Pine is a readily available option with good resistance to impact and pests. If you're on a tighter budget, MDF (medium-density fiberboard) is a viable alternative. Just ensure the wood panels are at least 2 cm thick to withstand accidental kicks or impacts.
- It’s not necessary to use the same wood as the stair treads. You can always paint, stain, or cover the risers to match the staircase’s overall appearance.
Use a circular saw or table saw to cut the wood panels to the measured dimensions. Apply the measurements you’ve taken and use a straightedge to mark the wood. Don’t forget to wear safety goggles before operating the saw. Then, turn on the saw and carefully cut along the marked lines to create each riser piece.
- After cutting each piece, label it to remember which step it belongs to.
Test-fit each wood panel to ensure it fits snugly into the gap. Go to the back of the staircase and place each riser panel behind the steps. Make sure the edges align perfectly with the gaps and don’t extend below the treads. If the panels are too large, trim them with a saw until they fit properly.
- Avoid cutting the risers too small, as this will leave gaps between the steps. If a piece is accidentally cut too small, you’ll need to cut a new one.
Install the Risers
Pre-drill 3 - 4 holes 1.3 cm from the bottom edge of each riser panel. Choose a drill bit slightly smaller than the diameter of the screws you plan to use. Drill the first hole 1.3 cm from the bottom edge and 2.5 cm from the end of the panel. Then, space the remaining holes evenly along the length of the wood.
- This step prevents the wood from splitting when you drive the screws through.
Apply wood glue along the pre-drilled holes. Choose the best-looking side of the riser as the front. Spread a thin line of wood glue from one end, through the holes, to the other end along the bottom edge of the riser.
- The wood glue will provide additional adhesion to prevent the riser from loosening or creaking over time.
Secure the riser to the back of the stair tread using screws. Position the riser against the back of the tread so the glue makes contact with the edge. Insert 5 cm screws into each hole and use a power drill to tighten them. Continue until the screw heads are flush with the back of the riser.
- Use C-clamps to hold the riser and tread in place if you’re having trouble keeping them aligned.
- If the stairs are made of hardwoods (e.g., mahogany, oak, etc.), pre-drill into the back edge of the tread to avoid damaging the wood.
Drill 3 - 4 holes from the top of the tread through the riser. Go to the step where you’re installing the riser. On the tread above the riser, position the drill bit about 2.5 cm from the front edge. Slowly drill through the tread to create holes that align with the top edge of the riser. Drill 2 - 3 holes along the length of the tread, ensuring they line up with the screws at the bottom of the riser.
Countersink the screws on the top of the riser. Countersinking involves sinking the screw heads below the surface. Insert screws into the drilled holes and use a power drill to drive them flush with the wood. Once done, check to ensure the screws are level and not protruding.
- If the screws aren’t fully countersunk, they could pose a tripping hazard or cause injury.
Install the remaining risers on the staircase. Continue sealing the upper gaps with riser panels. Each piece should fit snugly and be securely fastened. After installation, check for any movement or wobbling in the risers.
- You may need a step ladder to access the back of higher steps.
Complete the staircase
Apply wood sealant (caulk) along the seams at the back of each riser. Move behind the staircase and position the caulk gun at the junction between the riser and the stringer (the diagonal side piece supporting the stairs). Squeeze the trigger to lay a thin bead of sealant along the top and side edges of the riser. Use your fingertip to smooth the sealant into the seam and allow it to dry for 24 hours.
- The wood sealant will help reduce stair creaking and enhance stability.
Conceal screw heads with wood filler. Select a wood filler that closely matches the natural color of the wood you're using. Apply a small amount of filler, about the size of a fingertip, to each screw head. Use a putty knife to smooth the filler flush with the surface. Allow the filler to dry and harden completely before proceeding.
- You can purchase wood filler at local hardware stores.
Paint the risers for a cohesive staircase appearance. Start by sanding the riser surfaces with 180-grit sandpaper, then brush off the dust. Apply painter's tape to the treads near the risers to prevent paint smudges. Apply a primer coat to each riser, starting from the top step downward. Wait 4-6 hours for the primer to dry, then sand any uneven areas. Use a brush to paint long horizontal strokes from top to bottom. Allow the paint to dry for another 6 hours before removing the tape.
- If a second coat is desired, apply it after the first coat dries. Wait an additional 6 hours for the second coat to fully dry.
- Maintain consistent brush direction for an even finish across all risers.
Apply wood veneer to the risers to enhance their appearance. Purchase veneer and cut it to match the riser dimensions. Slowly peel the backing off the veneer and press it firmly onto the front of the riser. Use a rubber roller to smooth out air bubbles and ensure the veneer adheres evenly.
- Veneer is an affordable option to make risers resemble expensive materials like oak or mahogany.
What you'll need
- Tape measure
- 2 - 2.5 cm thick plywood or MDF
- Circular saw or table saw
- Drill
- Wood glue
- 5 cm screws
- Wood sealant
- Wood filler
- Paint (optional)
- Wood veneer (optional)
Tips
- If you're unsure about sealing the staircase yourself, consider hiring a contractor.
- Many home improvement stores sell pre-cut treads or risers, making it easier to install or replace parts of your staircase.
Warnings
- Staircases with gaps exceeding 10 cm are unsafe and non-compliant, as they pose a risk of injury if you slip or fall.
- When cutting new risers, avoid assuming all steps are of equal height. Measure each step individually to ensure a precise fit.
