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Floor Sanding & Finishing

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Gap Filling With Saw Dust & Clear Resin

Creating putty from saw dust and resin filler

Gap filling does two things. First, it improves the look of your wooden floors, makes them more attractive and second – it is the best way to deal with draughts. Once sealed, your floorboards will help to get the most out of your heating systems. You don't spend money - you save them by avoiding unnecessary bills during winter!

The Benefits of Gap Filling with Resin

There are two variations of the resin filler. The first is applied when mixed with sawdust and the second is stand-alone. We find that using a resin filler mixed with sawdust is the best option because they allow the product to perfectly match the floor’s colour.

Resin filters are not only cheaper than nearly all other options but also allow the floor some movement. Even more, they can be used on floorboards without tongues or grooves as the sealant can be applied to the edge of the board until it fills the gap. If you have sanded your floor previously you should use the dust with the filler. Floor sanding and gap-filling services complement each other very nicely and there is no reason not to combine them.

How to Fill Gaps With a Filler Resin Mix?

Gap filling process with saw dust and resin mixWater-based fillers are not a good choice because they can rust nails, shrink more than solvent fillers and take longer to dry. Solvent filters are probably the best option but they give off some fumes and wearing a respirator will be wise when working with them.

Gap filling with resin and sawdust is one of the most frequently used methods. Dust is collected from the fine floor sanding and mixed with a clear resin. One important thing to remember when using this method is the fact that resin dries very fast. You only make enough to apply it in the next few minutes. If you see that the resin dries faster than you predicted you can add more resin and stall the drying for a bit. Eventually, you have to discard even this, so work fast! Naturally, if used in a warmer room or during the summer you must be even quicker with the application.

The mixture itself can be made anywhere. Either in a vessel or directly onto the floor. A small knife will be ideal for mixing. A bigger filling knife is best suited for the application itself and the bigger it is, the easier will the process becomes. One filling won’t be enough. After the first coat had sufficient time to dry you need a second and third one. If you want the best possible results you will also consider lightly buffing and vacuuming before applying each new coat.

Different Floors Means Different Filling Approach     

The process of gap fillingMoisture is the main reason for the appearance of gaps. Different wood species show specific levels of hygroscopy and, therefore, react to humidity in their ways. The type of floor – parquet, hardwood and engineered also makes a difference. Engineered floors, for example, are more resistant to high moisture levels compared to hardwood because they are not made out of a single piece of wood.

Fixed engineered and board floors most of the time have bigger gaps. It’s possible to use coarse dust from rough sanding for those but it should be done with care. The first wood floor sanding runs strip a lot of dirt as well as dust and we don’t want it to become part of the filler mix. It’s probably best to reach medium sanding grit like P50 before filling, to make the floor both smoother and to ensure you have finer sawdust at your disposal.

A floating engineered floor is not directly nailed or glued to the subfloor. It will move constantly especially if it has been badly laid - which is often the case. There is little point in filling every gap in such a floor because it won’t hold - the best option is to only deal with the larger gaps.

Parquets have relatively minor space between blocks as long as they have been laid properly. Smaller gaps require finer sawdust which can be received mainly from sanding with higher grits. Other than that, the process goes pretty much the same as it does with the other floor types.

FlooringFirst! Services
158 Coles Green Road
London, NW2 7HW
T: 020 88309782