Gaps between floorboards: why they happen and what’s normal
Small seasonal gaps between floorboards are normal in real timber. Wood takes on and gives off moisture as indoor humidity changes through the year, so boards can shrink a little in a dry winter and close up again when it is more humid. Engineered oak and a correct, acclimatised install help keep that movement small.
Why gaps appear in a timber floor
Timber is a natural material that behaves a bit like a sponge. It takes on moisture and expands when the air is humid, and gives it off and contracts when the air is dry. Across an Auckland year that swing can be enough to open and close fine gaps between boards, most noticeably in winter when heating dries the air inside.
How much movement you see comes down to four things: the season and your indoor humidity, how well the floor was acclimatised before laying, the subfloor and its moisture level, and the install method. Get those right and the movement stays small, subject to acclimatisation and site conditions.
Which gaps to expect, and which to check
Fine seasonal gaps
These come with real timber and are not a fault:
- Fine, even hairline gaps that open in a dry winter
- Gaps that close up again in more humid months
- A little variation from board to board
- Movement that reads consistently across the whole floor
Gaps to check
These can point to a moisture issue in the subfloor, a floor laid without proper acclimatisation, or an install fault, and are worth a look:
- Wide gaps that keep growing over time
- Boards cupping or lifting at the edges
- Gaps in only one part of the room
- A spongy or hollow feel underfoot
How engineered oak and a correct install keep gaps small
Vienna Woods engineered oak flooring is built as a real European oak wear layer over a cross-bonded core, engineered overseas to our specification. That construction can move less with humidity than a solid timber board of the same width, which helps keep seasonal gaps small.
The board is only half of it. A dry, flat subfloor, proper on-site acclimatisation, and the right joint and installation method do the heavy lifting. Rush any of those and even the best board can move more than it should.
Four things that reduce gaps
Acclimatise on site
Let the flooring sit in the room it will live in, in its packs, so it settles to the home’s normal conditions before laying. Time depends on the product and site.
Check the subfloor
A dry, flat subfloor matters. Excess moisture in a concrete slab or timber subfloor is a common cause of movement and gaps down the track.
Use the right join
Tongue-and-groove and click-lock behave differently. Your installer picks the method that suits the floor and how it is fixed down.
Keep humidity steady
Big swings in indoor humidity move any timber floor. Many timber manufacturers suggest keeping indoor humidity around 40 to 60 percent to limit movement.
When to call your installer
A few hairline gaps in winter are normal and usually close up on their own as the air gets more humid. Do not panic if you spot them soon after installation, that is often the floor settling.
Call your installer if gaps keep widening, boards cup or lift, the movement is in one area only, or the floor feels hollow underfoot. Those can signal a subfloor moisture or install issue that is easier to sort early. Keeping the floor well looked after helps too, our guide to caring for your timber floor covers the day-to-day. Our team can walk you through it, or point you back to the installer who laid your floor.
Common questions
Are gaps between floorboards normal?
Small, even gaps that open in a dry winter and close in more humid months are normal in real timber, because wood expands and contracts as indoor humidity changes. Wide gaps that keep growing, or boards that cup or lift, can point to a moisture or install issue and are worth checking.
Why do gaps get worse in winter?
Indoor air is usually driest in winter, especially with heating running. Timber gives off moisture and contracts as the air dries, so fine gaps can open up. They often close again as humidity rises through the warmer months.
Does engineered flooring stop gaps?
Engineered oak is built as a hardwood wear layer over a cross-bonded core, which can move less with humidity than a solid board and helps keep seasonal gaps small. It reduces movement rather than removing it, and a correct, acclimatised install still matters.
Can you fill gaps between floorboards?
Larger gaps can be eased with a colour-matched filler, and gaps that appeared right after installation may close on their own as the floor settles. It is best to have your installer assess wide or growing gaps first, in case there is an underlying moisture or subfloor cause.
How do I stop new gaps forming?
Acclimatise the flooring on site before laying, lay over a dry, flat subfloor, use the right install method, and keep indoor humidity reasonably steady. Many timber manufacturers suggest around 40 to 60 percent humidity to limit movement.
Helpful next steps
Installation guide
How a timber floor is acclimatised, prepared and laid so it sits tight and moves as little as possible.
Caring for your floor
Simple day-to-day care and cleaning that keeps your oak floor looking its best for years.
See the oak range
Browse our engineered European oak collections, then order free samples to see the boards in your own light.
See the boards in your own home
Order free samples and check the colour, grain and finish in your own light, or ask our team about the right floor and install for your place.
