Why an Expansion Gap Is Needed Around a Glued-Down Engineered Oak Floor

1. Wood Still Moves – Even Engineered Oak

Engineered oak is made with multiple layers to reduce movement, but the top layer is still real wood—and real wood naturally expands and contracts with changes in humidity and temperature. Without a gap, the floor has nowhere to go when it expands, which can lead to:

• Buckling or lifting around the edges

• Creaking or pressure stress

• Delamination over time

  
  

2. Subfloor and Environment Changes

Even if the boards are glued down, the subfloor itself (usually concrete or screed) can expand or shrink slightly due to moisture changes. Combined with natural room humidity, this adds movement that the floor needs to accommodate.

3. Perimeter Gaps Prevent Long-Term Issues

A small, hidden expansion gap (typically 8–12mm) around the perimeter ensures:

• No pressure builds up against the walls or skirting

• The flooring stays flat and stable over time

• There's space for seasonal movement without visible damage

The gap is usually covered by skirting, beading, or door thresholds, so it's not visible but plays a crucial role in the floor's long-term performance.

🛠 Even with Glue-Down, Expansion Gaps Are Standard Best Practice

Whether it's floating, nailed, or glued, all wood flooring needs room to breathe.

At JS Woodcraft, we recommend a perimeter gap on all installations—including glue-down engineered floors—because we want your floor to stay beautiful and stable for years to come.