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Hardwood Flooring Gap Filling & Board Replacement Wilmington NC | Fixes That Survive Winter
Gaps in an old floor are the wood doing what wood does, and the reason most gap repairs fail is that rigid filler was forced into a joint that moves several times a year. In the historic houses of downtown Wilmington, Southport and Burgaw, winter heating shrinks century-old boards and opens drafty gaps that close again by August. Wilmington NC Hardwood Flooring fills them with materials and methods that can live with that.
Hardwood Flooring Gap Filling & Board Replacement Wilmington NC
The first question is whether a gap is seasonal or permanent. A seasonal gap opens as the heating season dries the air and closes again in humid months. A permanent gap results from boards that have shrunk and never recovered, or from a floor installed at the wrong moisture content. Filling a seasonal gap in January guarantees the filler gets crushed out in August.
- Gaps assessed for whether they are seasonal or permanent before filling
- Large permanent gaps filled with fitted wood slivers, not putty
- Flexible fillers used where some movement has to be accommodated
- Late winter is the ideal time to measure gaps at their widest
A Dutchman sliver is the durable answer for a wide permanent gap. A tapered strip of matching wood is cut to the gap profile, glued in and planed flush, so the repair is wood against wood and moves with the floor. It is slow, skilled work compared with running a tube of filler down a joint, and it is the only approach that lasts in a historic floor.
The usual approach
Force rigid wood putty into every gap in January, then watch it crack, crumble and spit out along the whole floor by the following summer.
How we do it
Establish whether each gap is seasonal or permanent, use fitted wood slivers on the wide fixed ones and a genuinely flexible filler where movement has to be allowed for.
Related free guide: our Coastal Humidity and Hardwood Floors in Wilmington covers the background to this in more depth, with the numbers and standards we work to.
- Assessment
- Seasonal versus permanent gap determination, measured at width
- Wide gaps
- Tapered wood slivers glued and planed flush
- Moderate gaps
- Flexible filler systems that accommodate movement
- Board work
- Individual board replacement where a board is beyond filling
The Hardwood Flooring Gap Filling & Board Replacement Sequence We Follow
Survey and classification
Every significant gap is measured and classified as seasonal or permanent, ideally at the point in the year when they are widest.
Clean out
Existing failed filler, debris and dirt are removed from the gaps completely, since nothing new will bond over old material.
Fill or fit
Wide permanent gaps take fitted tapered wood slivers glued in place. Moderate gaps take a flexible filler system chosen to move with the floor.
Level and finish
Slivers planed flush, fillers leveled, then the area sanded and finished so the repairs disappear into the floor.
Before The Crew Turns Up
Gap work benefits from a bit of observation on your part before we start.
- Note when the gaps are at their worst through the year. That single observation tells us whether we are dealing with seasonal movement or permanent shrinkage.
- If possible, schedule the assessment for late winter when gaps are widest. Measuring at the wrong time of year leads to the wrong filling decision.
- Check your indoor humidity if you can. A house running very dry in winter will keep producing gaps regardless of what we fill.
- Point out any gap that has objects fallen into it. Clearing debris out of a deep gap is part of the job and it is easier if we know where to look.
- Tell us if the floor has been filled before and with what. Old failed filler has to come out completely before anything new goes in.
Hardwood Flooring Gap Filling & Board Replacement Questions
Why does the filler in my floor keep cracking and falling out?
Because a rigid filler was used in a joint that moves seasonally. As the boards swell in humid months the filler is crushed, and as they shrink it is torn. The answer is either a fitted wood sliver or a genuinely flexible filler system.
When is the best time of year to fill floor gaps?
Late winter, after the heating season has dried the house and gaps are at their widest. Filling then means the filler gets compressed rather than torn when humidity returns. Filling in high summer is the worst option.
Should I fill every gap in my historic floor?
Not necessarily. In an old house modest gaps are normal behavior and part of the character, and filling all of them can look wrong. We usually focus on the wide ones and the ones causing drafts.
What is a Dutchman sliver?
A tapered strip of matching wood cut to fit the gap profile, glued in and planed flush. Because the repair is wood against wood, it moves with the floor instead of being crushed by it, which is why it lasts where filler does not.
Do I need to be present while you fill the gaps in my floor?
Only for the survey, where your observations about when gaps are worst are genuinely useful. The filling and finishing work does not require you on site.
Do you offer free quotes for gap filling and board replacement?
Yes. If you contact us in summer when gaps have closed up, we may suggest reassessing in late winter, because measuring at the right time leads to a much better result.
The Things Worth Knowing About Hardwood Flooring Gap Filling & Board Replacement
Gap work is one of the few flooring jobs where timing in the year genuinely matters.
Measure at the widest point of the year
Late winter, after weeks of heating, is when gaps are at maximum. Filling to that width means the filler is compressed rather than torn when the floor swells back. Filling in August produces the opposite and much worse result.
Drafts are a real reason to do this
In a raised Wilmington house over a crawlspace, open floor gaps let conditioned air out and humid crawlspace air in. Closing them improves comfort and reduces the moisture load on the floor itself.
Sawdust and glue mixtures have their place
Fine dust from your own floor mixed with a binder color matches perfectly because it is literally your floor. It works well on hairline gaps and poorly on wide ones, where it shrinks and cracks.
Some gaps should be left alone
In a genuinely historic floor, modest gaps are part of the character and the building's normal behavior. Filling every one can look wrong and can also restrain movement in ways that push problems elsewhere.
A gap that keeps growing is a symptom
Gaps that widen year on year rather than cycling seasonally mean the floor is still losing moisture. The cause needs finding, because filling will not stop the process.
Gap work pricing
Gap filling is priced by the linear run of gap being treated rather than by room area, since a room with three wide gaps and a room with forty are very different jobs. Fitted wood slivers cost considerably more per foot than flexible filler because they are hand cut and fitted. This work is often combined with a refinish, which is more efficient since the floor is being sanded flat afterwards anyway.
Considering hardwood flooring gap filling & board replacement for your home?
We will come and assess it properly, then give you a scope broken into real line items rather than one number.