For the small-scale percentage of you living in really old houses (anoint you!), let me share one of the more than historically accurate means to fill up gaps in wood floors with oakum.

This is the information I needed when we bought our Colonial Farmhouse and didn't know what to exercise about the gaps between the original forest floorboards. I had to comb through the cyberspace to observe bits and pieces of data, so I'm combining what I learned all in one place with links out to the information that helped me.

If the gaps in your wood floors don't bother y'all, go out them. Only if your kids tin button things through the cracks like it's their very own slot machine, if a cup of juice can spill through the gap in the floors and land on the basement floor beneath, or if bugs (and then many bugs) tin crawl through the cracks, you may want to consider filling the gaps betwixt the forest floors.


Why Are At that place Gaps Between Former Wood Floors?

There could be a diversity of reasons, but many woods floors from the 1700s and 1800s (or before) were nailed to the floor joists with a fleck of a gap between the planks to allow for expansion and contraction of the wood betwixt seasons.

Some of the oldest floors in our house (circa 1780s) accept wider than expected gaps considering edges of the boards have worn or broke off.

In some areas of our home where there'southward non a ceiling below those floorboards, the gap in the floor allows you to see right through it to the room below.

music room wood chandelier


How Were Gaps in Wood Floors Filled in These Old Houses?

The short answer is they shoved something in-between the gaps in the wood floors.

This was likely washed with either oakum, natural fiber rope, or cotton cloth. I've even heard of people finding newspaper shoved betwixt the gaps in their wood floors.

People sure do observe a manner to fix a problem, don't they?


What is Oakum?

Oakum is what was used to caulk woods ships.

How did oakum come to exist? Sailors used to oil the natural fiber ropes for rigging to make them last longer. When the ropes finally wore out, someone would untwist the rope (it was a terrible chore) and the remaining oil-soaked fibers were called oakum.

Oakum was widely used for all fashion of applications earlier the invention of chemical caulking. Information technology tin be used to seal plumbing pipes, to caulk cracks in concrete, to seal wooden ships, or for hoof packing for horses.

Nothing was wasted dorsum in the day, and then oakum was also sometimes used to fill the gaps betwixt wood floors.

Oakum is still used today, especially in the structure of log homes. Still, oakum is now manufactured, equally opposed to being reused from marine rigging, and then you can look a consequent event from the oakum yous purchase.

Oakum appears to be manufactured by a few different companies, or at to the lowest degree, sold under a few different brand names.

Brown oakum is made from natural fibers (could be a combination of jute, hemp, and/or burlap), oil, and ofttimes bentonite.

White oakum is made from jute, Bentonite, and water.

Bentonite is a clay that expands when it encounters water.


What Exercise You Demand to Fill Gaps in Wood Floors With Oakum?

You demand oakum. It is usually sold in ane pound or 5 pound increments and at the time I'yard writing this I found information technology to exist extremely affordable.

(If you lot don't desire to employ oakum to fill the gaps in your wood floors, you could also use a natural fiber rope either as is or stained to friction match your floor. The same installation techniques detailed below will apply.)

You'll also need a tool to shove the oakum into the flooring gaps. I used a multipurpose pigment tool, but a putty knife would piece of work in a pinch.

I wore gloves because I didn't like how the brown oakum I ordered felt on my hands.(I learned almost the white oakum later.) It feels a bit like touching really oily man hair. Aren't yous glad yous have that visual? Ha!

how to fill gaps in wood floors with oakum


Installation Technique to Fill Gaps in Wood Floors With Oakum

The oakum comes in twisted strands that are super easy to pull autonomously.

Divide the strands of oakum into a size slightly larger than your gap. Then tightly re-twist the oakum so it resembles a rope strand. Yous need your oakum strand to fit very snug when y'all push information technology into the gap, just non so tight that you accidentally suspension off the sides of your wood planks to insert it. I learned that the difficult way.

The oakum tin can be trimmed to the length y'all need with precipitous pair of scissors.

how to fill gaps in wood floors with oakum

So using your paint tool or putty knife, press the oakum into the gap between the wood planks. Y'all desire to push it down below the planks slightly – at least 1/eight to 1/four-inch. Withal, I've plant the farther you lot tin button the oakum into the cleft without pushing it all the style through, the better information technology will exist later for cleaning purposes.

If there are a lot of "flyaways" from the fibers, try twisting the oakum strand tightly before pushing it into the gap. If in that location are whatsoever random flyaways when yous are finished, you can trim them with scissors.

Learn from my mistakes! In the below picture, I should take twisted the oakum tight. I ended up re-doing this section afterwards to eliminate all the flyaways.

how to fill gaps in wood floors with oakum

The pigment tool worked great because one of the ends had a rounded signal that was good at working the oakum into a slightly tight area.

It was piece of cake to accidentally push the oakum all the way through the larger gaps. If this happens, just pull it back out with your paint tool and try over again.

how to fill gaps in wood floors with oakum

I also used the oakum to fill or pack other random holes in the wood floors like gaps left by nails, breakage around a wood knot, or space around a wood plug.

The gaps betwixt our floorboards were not uniform because why would this old house make it piece of cake? The benefit I found with the brown oakum is that the fibers are super flexible, I think, partly considering of the oil. That meant that I could grade and reform strands to a custom width.

I could likewise wrap the start of one strand of oakum effectually the end of another so that there wasn't any break in the strand every bit I was filling a long gap. I found this tip to be specially important later when I was mopping the flooring. In the places where I had a pocket-size, random "tail" of the oakum lying too virtually the top of the gap, it was like shooting fish in a barrel for it to catch on my mop strands.

I was able to repositioned the oakum when I figured out what was happening and now know how to install information technology ameliorate to avoid this problem. This is the mop I was using with just a bit of water.

how to fill gaps in wood floors with oakum

Update July 2021:After living with the oakum for 2 months, I had some sections that needed to exist redone because I didn't take my own communication. Ha! Figures! At that place were areas of oakum that were pulling upwardly because I didn't have either enough oakum in the gap to brand information technology tight or I didn't twist two sections together tightly plenty to avoid a tail sticking up. Basically, it took some trial and error to get good at the installation technique. But, overall, I'm happy with how information technology has performed in regard to cleaning. As long as oakum is in the gaps tight and slightly below the surface, I haven't had a problem with vacuuming with a wand or taking a clammy rag over information technology.


Downside of Filling Gaps in Woods Floors With Oakum

I'm certain the internet volition assist me out with this (ha!), only I did think of two downsides to using brown oakum to fill up the gaps in our forest floors.

(Call back, I'chiliad figuring things out every bit I get and didn't learn almost the white oakum until later. Y'all tin can learn from my experience, only be kind with your comments!)

First, the brown oakum has oil in it and for a multifariousness of reasons, you might non want that in your habitation. Natural cobweb rope or white oakum might exist a ameliorate selection in this case, but I don't know if either volition match or alloy in with your floors.

Second and related to the first downside, later inserting the dark-brown oakum in one especially big gap (i/2-inch) where it left a lot of the oakum visible and closer to the wood surface than I would have preferred, I did pause and think that maybe if I had babies itch around on the flooring I would accept used a natural fiber rope or white oakum in that gap instead of the brown oakum that had the oil on it.

On the other manus, I chose the brown oakum over rope because I was going for maximum protection against water since this particular flooring was in a wet expanse. If information technology could seal a wooden transport, it should exist able to to protect my home.

Update July 2021: The oakum exposed to the surface did dry out out and become less oily over time, which addressed some of the above concerns.


Last Thoughts on How to Fill Gaps in Wood Floors With Oakum

I'm writing this tutorial a month after nosotros used the oakum to fill up the gaps in our wood floors.

In that location are definitely pros and cons to using oakum to fill gaps in wood floors. So far, I'm happy with the issue in terms of how the oakum blends into the floors and how it is performing, only the lesser line is I'll need to lookout the oakum over time and report back on how well information technology holds up to daily utilize, cleaning, if that top layer remains oily, etc.

If I make up one's mind I don't like it, it's super like shooting fish in a barrel to popular it out and first over. I have nearly $25 of oakum and an hour's worth of time into this experiment, so I'm not out much if I decide to endeavor another solution to fill the gaps in our forest floors.

There are sections of our wood floors where the gaps have been filled, I'm assuming 150 – 200 years ago, and the filler that was used has hardened. I'1000 bold they used oakum perhaps with some tar on top, but I'm not certain. That's another reason why I'm curious to see what happens with the oakum I installed. There's just non a lot of information available nigh the longterm viability of this solution. I'yard hoping that together, every bit former house owners, we can change that!

Our original wood floors are ane of the absolute best parts of this Colonial Farmhouse. If those floors could talk! I am so happy we become to live here and it is important to me, as a flagman of this home, to respect its historical nature while balancing the needs of a modern family.

If you lot try filling the gaps in your wood floors with oakum or a natural fiber rope, allow me know well-nigh your experience in the comments. Your insight might exist able to aid someone else who wants to tackle this project.


Project Resources:

Painter'due south Tool: (like)

Brownish Oakum: Amazon has a 1 lb. bag. Retrieve that you will be separating the strands into smaller pieces, so 1 lb. is a lot more than it seems. I'm not certain how many gaps information technology volition fill though. If yous need A LOT of it, I ordered a 5 lb. box Nupak Oakum from Schroeder Log Home Supply. I haven't finished using my box, but I tin can probably tackle nigh of the rooms in our firm with that 1 box.

*affiliate links are used in this postal service*


Website Resources:

The post-obit websites helped me tremendously in learning about oakum and its uses and I think they will help yous too.

The American Institute of Architects Historic Resources Committee

Sage Restoration

Nupak Oakum

This Old House

One-time House Web

If you accept data to add together most this topic, please leave information technology in the comments section so others can learn too. Thanks!


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