Floating Floors

If you’re sick of staring at tiles from the 1970’s or you have a concrete slab floor (?), this guide is for you! Laying a floating floor is a great way to update your house.

Materials List

  • Floating floor boards
  • Tapping block
  • Hammer
  • Spacers
  • Underlay
  • Drop Saw
  • Circular or Jig Saw
  • Multi-tool

A floating floor is a type of floor made of interlocking pieces, that “floats” on top of your existing floor (concrete slab or floorboards generally). This is much easier than glueing or nailing a new timber floor down, but has the disadvantage that it needs gaps around the edges to allow the floor to expand and contract. Floating floors range from $15sqm, to over $100sqm. At the lower end of the scale you find thin laminate, and at the upper end hardwoods or bamboo.


Here are the tools you are going to need:

Floor laying kit

These are available at pretty much any hardware store. They include:

  • tapping block
  • tapping block for tight spaces
  • spacers (plastic wedges)


If you don’t already own a hammer, I can’t help you. Stop reading now, go call someone else to do it… then go back to crossword puzzles and watching the Bold & the Beautiful.

Drop Saw

If you don’t have a drop saw, get a drop saw. You could use a jig saw, or a circular saw I guess, but a drop saw will make things go much faster.

drop saw yay!

Jig Saw

If you have any awkward cuts, you will need a jig saw.

Circular/Table Saw

You will need one of these to cut the last few planks length-ways. You could use a jig saw, but you really shouldn’t. It’ll be painful, and probably not overly straight.


If you are running up to any door frames, you will need a multi tool. The multi-tool allows you to rebate the base of the door frames and conceal the ends of the plants. A hammer and small chisel will help remove the waste.

Floating Floors can look great

Here are some pictures of recently completed floors. These particular floors are both strand-woven bamboo, costing about AU $40sqm (including underlay).

Carbonised color bamboo

Carbonised colour Bamboo floor.

Natural color bamboo

Natural colour Bamboo floor.

Things to know before starting

  • Is your slab new, or prone to dampness? You’ll need a moisture barrier. In English, that means you need some builders plastic. This goes down before the underlay, and will protect your floor from rising damp.
  • When estimating, allow for an extra 10-15% over and above the area you need to cover. This is for waste from cutting down boards to fit corners, angles, end of the room… and also when you are a numpty like me who cuts a board back to front, then upside down, then back to front again.
  • Once a board is locked in place, and has boards locked on all 4 sides, it is not coming out. So, if you have to replace a stuffed board, it is going to be nothing except pain and suffering. Make sure you check each board before you lay it, to ensure it doesn’t have obvious defects (scratches, chips, etc).
  • Expansion joints between rooms. Some companies specify that you must include these every x number of meters. My supplier explicitly told me not to use them. Make sure you find out either way.

Laying the Floor

  • floor with holes


    Assuming you are laying over a concrete floor, you are going to need to make sure it is level. If you don't, floor boards will squeak, and the floor may have a springy feel when you walk on it. To level it, grab a decent length spirit level, or even a nice true (straight) length of wood. Use a sharpy or chalk and mark any depressions. To fill in the depressions, I used a product called "Dunlop Floor Repairer - Rapid Patch".
  • laying underlay


    At this point, if you are going to run the floor under your skirting boards you will need to remove them (see elsewhere on this page).

    Now you can roll out your underlay. Underlay should run the opposite direction to your floor boards (ideally). Roll the underlay out to the other side of the room. Tuck the starting side under the drywall, and put something heavy on it, or get a friend to hold it.

    Back on the other side of the room, unroll a bit more than you need, and cut the underlay off.

    Now push the underlay down against the wall (under the dry wall a little if possible), and use a stanley knife to cut away the excess. Repeat until the room is done. cutting underlay

  • laying boards


    It is important to stagger the floor boards in a fairly random pattern, otherwise you will end up with a grid. A grid floor won't be as strong, and will look dumb, so don't do that.

    Start with a full board. The board should start a small distance from the wall (the gap should be small enough to cover with scotia or skirting boards). Use wedges/spacers to ensure a consistant gap.

    For the second row, cut a board about 1/3rd of the way down, then attach the next board to it.

    You should only be cutting boards at the start and end of each row, all boards in between should be full length.

  • more boards


    For subsequent rows, stagger the boards randomly, making sure that no starting boards sit next to a board of the same length.

    To finish a row, you will have to cut the board down so it will fit against the wall. To do this, lay the board up against the wall, then flip it on the short edge. The board should now be upside down, and the wrong way around. Push it back against the wall, then use a sharpie to draw a line about 1 fingers width from the board it will connect to (this will allow room for the boards to lock together). You should now be able to lock the board into place.

  • Final board


    In a perfect world, you will have a space left exactly the width of one board. Otherwise you will need to cut a board length ways. Measure the remaining gap, then subtract a small amount for your expansion/scotia/skirting gap. By far the best tool to cut length ways is a table saw. The second best tool is a circular saw. The 3rd best is a jig saw. Anything else is a waste of time.
  • Finishing


    Ok, you should now be able to get your last row locked in, but the fun doesn't stop there. Now you either need to put down scotia, or skirting boards. You also need to add your door transitions.


Here’s some tips I picked up along the way.

How to cut lengthways with a Circular saw

Sometimes we need to cut a plank lengthways to fit a tight spot down the side of a room. Ideally, use a table saw. If you don’t have a friend with one of these, you can use a circular saw instead.

I’ve found the best way to do it is to turn the plank upside down (this puts the rough cut on the bottom of the board), then clamp a long piece of timber to it, and use the timber as a guide for your saw.

You can free hand cut (after marking the line to cut!), but make sure you have the board clamped securely to a saw horse.

Dealing with Doorways

You will need to rebate the door frames. This means cutting a slot in the lower part of the door frame for the board to slot into. This hides the end of the board, and keeps everything looking neat.

  1. Use an offcut board as a guide. Push it up against the door frame.
  2. Using a pencil, draw a line along the door frame - using the board as a guide.
  3. Get out your multi tool and cut along the line. I found I could rest the multitool on top of the board I used as a guide. This kept the cut straight.
  4. Use a small chisel and hammer to tap the waste out.

You should now be able to slot the board in.

rebating doorway

Handling silly angles

Unless your room is a perfect square, you will probably have to deal with some silly angles around door ways or other obstacles. In this case, make a template out of cardboard. Once you are happy with the template, flip it over and place it on the back of the floor board and trace the cutting lines with a sharpie. Then, use a jig saw to cut out the shape.


silly angles


When marking cut lines for corners, remember to mark on the back of the board, and cut upside down, this minimises tearout. Since you are marking on the back of the board, remember to reverse your cut lines, otherwise when you cut it - everything will be backwards!

Make sure you mark the waste section with x’s. It makes it easier to get it right while doing a cut. A jigsaw is the best way to handle these sort of cuts.

cuting corners

Room Transitions

How do we deal with transitions from floating floor to carpet (or other surfaces)? Use transition strips. They come either flat, or as “ramps”, and come in a variety of finishes - either timber look, stainless, or bronze.

The timber strips are generally made of metal, with a sticker or paint over the top.

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  • Cut transition strips using a hacksaw. Do not use a drop saw. I overestimated my drop saw, and came dangerously close to crapping my pants… or worse.
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To install transition strips, the process is generally:

  1. Use a hammer drill to drill a series of holes into your slab / floor.
  2. Slot plugs into the bottom of the transition strip.
  3. Line up the plugs with the holes, and lightly tap the strip into place with a rubber mallet.

rebating doorway

Scotia or Skirting?

Scotia is quarter rounded lengths of timber that can be placed at the bottom of your existing skirting boards to cover the gap around the edges of the floor boards. Generally, scotia is going to be a lot easier to install. Removing skirting boards is a pain in the arse. That said, removing and re-fixing the skirting is going to give a cleaner job.


This picture shows some scotia purchased from Masters Hardware. Bunnings have scotia too, but the stuff at Masters looks nicer.


Concrete Floor Grinding for Dummies

If you want your floor to be really really flat, it’s hard to go past a concrete grinder… at least if you can get the bloody thing into your car.


Let’s pick up from my last post - where I was removing floor tiles. I thought I was almost done, and could just finish up with an angle grinder. Then I realised I had more left over thin set left than I had thought. This was going to take a very long time. My DIY dusthood probably wouldn’t last that long either.

What to do?

We need a bigger grinder

What I needed was a really big angle grinder with diamond blades. These exist… they are “Concrete Floor Grinders”. I got in touch with Kennards Hire, who had a shiny looking floor grinder that would fold and fit in my car. The downside is that they wanted about $500 for 24 hours.

I discovered a cheaper hire place - Brisbane Hire, who are actually based in Stafford. Maybe they should be called Stafford Hire? Anyhow - they will hire a floor grinder for $170 for the whole weekend. Fantastic. I booked it, and organised a pickup time.

Small car, big grinder

Picking up the grinder

The Grinder was large, heavy, and did not have folding handles. The staff at Brisbane Hire offered to help get it in my car. You could almost taste the disappointment when they discovered I have a 4 door family car. It took 4 people to get the thing into my car. Getting the grinder back into my car single handedly at 11pm on a Sunday night was a whole other story.

Setting up and grinding

After using the angle grinder, I was expecting a lot of dust (even with the floor grinder having a dust extraction port). I hired a 300mm extraction fan with a 10m duct, taped everything off, and raised my router to safety.

I connected up a Ryobi shop vac to the floor grinder, and hit the switch.

It wasn’t very loud - the shop vac was louder. Despite the weight, the grinder moved around fairly well.

Router moved to a safe spot Grinder and Shopvac grinding more grinding

Here’s a few tips:

  • Don’t stop in one spot too long, you will gouge the concrete.
  • Do not use without a shop vac, the dust is unbelievable.
  • If you have more than one set of blades, use the rougher blades first, then the finer blades to get a smoother finish.
  • If the thin set is thick, it will take multiple passes to get through. It is faster to have a mate hitting the the thicker patches with a demo hammer, or hammer drill and chisel while you drive the floor grinder around
  • You can’t rush this thing. It moves at the speed it wants to go at, regardless of how hard you push.
  • It is large and heavy. Be careful when close to the walls. You will take chunks out if you hit them with the handle.
  • Brush the area frequently, so you can see if you have missed patches.

Overall, it was pretty easy to use, even for a complete novice. For reference, it took about 5 hours to cover 75sqm.

The result

Smooth Smoother Smoothest

Not bad, eh? Now it is ready to have a floating floor laid on top.

Big thanks to Jared, who spent half his weekend helping with the grinding.