Hardwood Floor Refinishing: When to Sand and When to Screen-and-Coat

Understanding Hardwood Floor Refinishing: When to Sand and When to Screen-and-Coat | D&D Interior Services

Refinishing hardwood floors is one of the highest-ROI renovation investments — understanding whether your floors need a full sand or a lighter screen-and-coat determines cost and outcome.

Hardwood floor refinishing restores the original surface of solid hardwood by removing the existing finish and any surface scratches or discolouration, then applying fresh stain (optional) and a new finish coat. Done well, a refinished hardwood floor is indistinguishable from new.

Key Considerations

The full sand-and-refinish process uses a drum sander to remove 1 to 2 mm of the wood surface, eliminating deep scratches, stains, and the existing finish entirely. This is the appropriate method for floors with significant wear, deep scratches, pet staining, or uneven surface texture.

Screen-and-coat (also called buff-and-coat) is a lighter process that uses a floor buffer with an abrasive screen to scuff the existing finish surface without cutting into the wood. New finish is applied over the scuffed surface. This works well for floors that are dulling with age but have no deep scratches or staining, and costs roughly 40% less than a full sand.

Getting Started

The number of remaining refinishes in a hardwood floor depends on its original thickness and how many times it's been sanded. Most solid hardwood floors (3/4-inch) can be sanded 5 to 7 times over their lifetime. Each full sand removes approximately 1/8 of an inch. Engineered hardwood can typically only be sanded once or twice.

Waterborne polyurethane finishes have largely replaced oil-based urethane in residential applications. They dry faster, have lower VOCs, remain crystal clear over time (no ambering), and are available in a full range of sheens from matte to high gloss. Oil-based finishes are still preferred by some clients for their traditional warm amber tone, particularly on red oak floors.