Floor Sanding Tips for Cape Cod Homes: How to Get a Professional Result

Start with the Right Grit

Grit selection is the most important decision in sanding. Start too coarse and you remove too much wood and leave deep scratches that must be removed with subsequent grits. Start too fine and you do not fully cut through the old finish, which compromises adhesion.

For a typical Cape Cod floor being refinished through the full thickness of existing finish:

• 36 or 40 grit: Initial pass to cut through old finish and level the surface. Most residential refinishes start here. If the floor has heavy cupping or very thick old finish, 24 grit may be needed first.
• 60 grit: Removes the deep scratches from the initial grit. This pass is critical and often skipped too quickly.
• 80 grit: Refines the surface further. At this point the floor should be starting to look smooth.
• 100 grit: Final pass before stain or finish application. This is the scratch pattern the stain and finish will show, so take it seriously.

Never skip a grit. Going from 36 to 80 leaves scratches from the coarser grit that will telegraph through the finish as you view the floor at a low angle in raking light.

Drum Sander Technique

The drum sander is the most powerful tool in a floor refinishing job and the one most capable of doing irreversible damage if misused. Key technique points:

• Always move with the grain. Sanding diagonally or against the grain leaves scratches that must be removed by starting over at a coarser grit.
• Keep moving. Lower the drum to the floor surface and immediately begin moving forward at a steady, moderate walking pace. Never let the drum sit still on the floor surface.
• Overlap passes by 50 percent. This prevents ridges between passes that become visible after finishing.
• Raise the drum before stopping. When you reach the end of a run, raise the drum, back up, and lower it again for the return pass.

JR Hardwood Supplies rents a professional Hummel drum sander to both contractors and homeowners. If this is your first time, the staff can walk you through technique at pickup. Do not hesitate to ask.

Edge Work Matters as Much as the Field

The drum sander cannot reach the perimeter of the room, typically a 4 to 6 inch strip along the wall. This is handled with a rotary edge sander using the same grit progression as the main floor. Edge sanding is where many DIY refinishes fall apart because the technique is harder and the results are more visible.

Sand the edges at an angle, not parallel to the wall, and blend each pass into the main field by feathering the edge sander slightly onto the already-sanded area. Corners require a hand scraper or detail sander, as the rotary edger cannot access right angles.

Humidity Timing on Cape Cod

On Cape Cod, plan your sanding for the cooler, drier parts of the day when possible. Morning is typically better than mid-afternoon in summer, when offshore breezes push humidity up. Sanding in very high humidity (above 70 percent) raises grain more aggressively and can cause sandpaper to load faster, requiring more frequent changes.

After sanding, vacuum thoroughly with a fine-dust shop vacuum, then wipe with a tack cloth before applying stain or finish. Any dust left on the surface will become a bump in the finish coat and require additional sanding to correct.