Laminate

Installing Wood and LVP Stair Nosing

Installing wood and LVP on stairs: full-adhesion rules from Shaw and Mohawk, nosing types, and checking riser heights against code.

Updated · 2 min read

Stairs are the one place a floating floor can't float. Manufacturers require full adhesion,[1][2] and the nosing needs both adhesive and mechanical fastening. Adding flooring also changes riser heights, which is a code issue as well as a trip hazard.

Check riser heights first

Flooring on the landing and the stairs changes the height of the first and last risers. The residential code limits how much risers can vary. The model code limits are below (IRC R311.7.5.1 risers, R311.7.5.2 treads, R311.7.5.3 nosings):[3]

  • Maximum riser height: 7-3/4".
  • Minimum tread depth: 10".
  • Nosing projection: 3/4" to 1-1/4" where nosings are required.
  • Risers and treads within a flight can vary by no more than 3/8".[3]

Measure the top and bottom risers with the new flooring included. States amend these numbers; North Carolina's residential code, for example, allows a taller riser and a shallower tread than the model IRC. Check the code your jurisdiction has adopted.

Flush vs overlap nosing

The nosing type depends on the flooring and how the stair is built. Start with the nosings the flooring maker sells for that line.

  • Overlap nose: sits on top of the tread flooring and laps over the front edge. Set it on an S-shaped bead of polyurethane construction adhesive.[2]
  • Flush nose: sits level with the tread flooring. Mohawk's flush nose needs a 1.7" gap filled with a shim that is stapled or nailed down.[2]

Full adhesion, top down

The order and the fastening are spelled out in the stair instructions.[1]

  1. Remove any attached pad from the planks before they go on the stairs.[2]
  2. Start at the top step and work down: tread, then riser, then nose.
  3. Full-spread glue every plank and molding; steps must be fully adhered.[1]
  4. Glue the nosing and fasten it with finish nails or trim screws. Pre-drill the moldings.[1]
  5. Clamp or weight pieces while the adhesive grabs.
  6. Keep traffic off: 12 hours for Shaw;[1] for Mohawk, at least 4 hours before walking and 24 to 48 hours before full traffic.[2]

Common mistakes

Stair callbacks usually come from a loose nose or a floating install.

  • Floating planks on treads. Stair installs require full adhesion.[1]
  • Glue-only nosing. The nose needs mechanical fasteners too.
  • Leaving the pad on. It keeps the plank from bonding.
  • Ignoring the top and bottom risers. A short or tall step is a trip hazard.

Tools we carry

These help with measuring, scribing and clamping on stairs.

References

  1. Shaw: Stair tread and riser installation
  2. Mohawk: Stairnose installation
  3. ICC: International Residential Code, Chapter 3

Linked PDF documents are archived copies saved by PreFloor Tools so they stay available if the publisher moves or removes them. Check the publisher's website for the latest revision.

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