Boise Stair and Transition Flooring Guide

Why these details matter

Most of a floor is repetition: row after row of the same plank. Stairs and transitions are the opposite. Every tread is measured and cut individually, every doorway has its own height problem, and every one of them is right at eye level or underfoot where people notice. They also take far longer per square foot than open floor, which is why stairs are usually priced per step, not by area.

Plan them early. The flooring you choose for the main level decides what's available for the stairs (not every LVP line has a matching stair nose), and the thickness of each floor decides which transitions will work between rooms.

Stair options

Solid wood treads and risers

The traditional approach replaces the treads with solid hardwood treads, often with a rounded bullnose edge, and the risers with painted or stained boards. It's the most durable option and can be refinished with the floor. It's also the most labor. Old treads come off, and each new one is scribed to fit the skirt boards and walls on either side.

Retrofit treads and stair caps

Retrofit or cap treads go over the existing stair structure after the old nosing is cut back flush with the riser. They're thinner than a full tread, which matters for riser heights (more on that below), and they're a common way to get hardwood or vinyl stairs without demolishing the staircase.

LVP and laminate stairs

Plank flooring on stairs is glued and fastened to each tread, with a matching stair nose at the front edge. Nosing comes in flush (sits level with the tread surface) and overlap styles. The planks are not floated on stairs. Ask whether the stair nose is made for the specific product line; mixing brands rarely matches in color or thickness.

Carpet on stairs

Carpet goes over pad and is held with tack strip at the back of each tread and bottom of each riser. Two common styles: waterfall, where the carpet drapes over the nose to the riser below, and cap-and-band (sometimes called Hollywood), where it's wrapped tightly around the nose and tucked under. Cap-and-band looks more tailored and takes longer.

Riser heights and safety

This is the detail that gets missed. Residential building codes limit how much riser heights can vary within one flight of stairs; the International Residential Code, which many jurisdictions adopt, uses 3/8 inch as the maximum difference between the tallest and shortest riser. People's feet expect every step to match, and a step that's off by more than that is a trip hazard.

New flooring can create that problem. Adding a thick floor at the top landing makes the top riser shorter. Removing tile at the bottom makes the bottom riser taller. Cap treads add a little to every step except where the stair meets the floor. A careful installer measures the finished heights of both floors before choosing stair materials and adjusts so the first and last risers still match the rest. If your stairs are part of the job, ask how that will be handled, and check with your city's building department if the stair itself is being altered.

Handrails and balusters belong in the same conversation. Replacing treads can mean removing and reinstalling balusters, and an open-sided stair needs its rail to stay solid when the work is done.