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« Climate Change: From Parish to Planet | Main | Installing a wooden floor on joists »

24 January 2007

How to lay a wooden floor: Keep it Simple

Installing a wooden floor (solid or wood-engineered) as DIY-er isn’t rocket science, more a case of common sense, patience, using the correct materials and making the correct preparations.

Some things are so obvious we won’t go into them in detail (like buying wood that is suitable to be installed as floor and dry enough, meaning: timber wood – 15% moist or more – isn’t suited and that the room is wind and weather proof, wet decoration work finished etc).

Correct materials and correct preparations
:
Quality products might be a little bit dearer; in the end it will save you time, aggravation and possibly even regret and money.

  • Make sure you have one type of underfloor and the underfloor is ready (dry, level, - remove existing floor-covering timely enough to make good any defects or unevenness in time)
  • Buy the correct underlayment (with the ‘floating-method’)
  • Have all the materials in house before you start, make a list of everything you need at least one week beforehand and make sure it can be delivered or collected on time (because some materials just run out of stock, you’ll know Murphy’s Law)
  • Make sure all tools you need are in the house, are working, sharp and safe (if you have to hire specific tools, place a reservation on them with the hire company so you’re not going to be disappointed)
  • Store the wood in the same area you plan to lay it (or in an area that has the same ‘climate-conditions’ – garages are a definite No No) 2 – 4 days before you start the installation; leave the wood in the packs (if wrapped in packaging material and according to manufacturers instructions, some do differ, most not).
  • Clear all furniture out of the room beforehand, dust from sawing will get in anything!
  • Remove – if needed – skirting boards, mark them when you do so you know which one to place back where to avoid mix-ups and extra cutting work when placing them back.

Preparations on the day (floating method with standard T&G fixing)

  • Ban little children from the room! (And cats, dogs or other pets.)
  • Check again if all materials and tools are there.
  • Materials: wood, underlayment, pvac-wood glue, spacers, beading or scotia, radiator-pipe-covers, thresholds, cloth (to remove excess glue as soon as you notice) and felt pads (for underneath furniture)
  • Tools: hand saw or Jig-saw, tape-measure, square, Stanley knife, pencil (at least three, they disappear in thin air), knocking block + installation bar (both should be part of any DIY installation kit you buy), hammer, heavy duty bin bags, work bench (tool box should do fine also as bench, watch out for sawing into it).
  • If needed, remove doors and undercut architrave and/or doorposts (chisel out the last bit).
  • Open two packs of wood, check for any damages to the surface, tongue and groove or click-system. If any and on more boards, re-pack as best as possible and return every pack straight back to your supplier for new material or re-fund. In no circumstances open more packs to check for damages, this might render your guarantee useless.
  • Check if the boards are straight by laying them with the groove side on the (level) underfloor. Also check for bowing – cupping. Slight bowing (middle doesn’t touch the ground) of long boards is normal, extreme cupping (the ends stand up and leave a gap of over 5cm if turned up side down i.e. top surface faces floor) not.

If everything is OK and in the wood-type, grade and finish you selected mix the two packs to get a natural look and colour, shade mixture (all boards differ in colour and characteristics). During the works, keep checking for surface damages before you install a board, once down and between other boards/rows it’s a pain to remove it. (Murphy’s Law: it will always end up in the middle of the room where you would notice it most - afterwards.)

Do read the fitting instructions (if any) the manufacturer supplied with the floor, some might differ on some points and not following their instructions could render your guarantee worthless. When in doubt, call your supplier.

The basic installation tips underneath are based on laying a wooden floor in a normal straight forward rectangular room without any obstacles or problems and in/under normal circumstances We do know that other shaped rooms will differ, but starting practice and common sense is the same.

Start at the wall that has the fewest doors, bay windows, fireplaces, alcoves or recesses and seems straight.
Lay the first row of underlayment parallel to the chosen wall from one end of the room to the other (when using DPM or Combi-underlayment move the row at least 3 – 5 cm up the walls, mind that you place the Combi-underlayment such way that the overlapping DPM strip is on the room side, not wall side).

Place the first board on top of the underlayment in that corner where both grooves (long side and short side) face the walls in that corner (some instructions state you have to start in a specific corner, use common practical sense).
Glue the groove on the short side of the next board (at the bottom of the groove to avoid glue splurting out above) and connect board one and two, making sure that there is no gap between the joint. A gap at one end of the joint indicates your boards aren’t connected straight. Don’t worry about spacers now.
Install the complete first row this way (use knocking block if needed); keep checking for gaps between the joints. The last board might need to be cut.

Trick of the Trade:

  • Place the new board (1) on the last board (2) already down (it will overlap of course) with the short end groove of board 1 facing the wall (that’s the wall it needs to end up to i.e. closest by).
  • Carefully slide board 1 till it touches the wall, find the exact spot where short side tongue of board 2 begins (i.e. the real surface of board 2 starts) and mark this on board 1.
  • With square and pencil mark the cut line and cut board 1.
  • If done correctly the groove of the shortened board should slit in the tongue of board 2, finish the row completely and leave an expansion gap (size of the tongue) at the wall in one go.

Make sure all joints of row 1 fit tightly and straight. Then move row one slightly away from the wall enough to place your spacers and move row one back against the spacers. Once this is done, check joints again.
Making sure your first row is straight is the most important step of the installation.
If needed use extra thin material behind some of the spacers to ensure the first row is straight.

If the remaining left over part of the last board is 30 cm (1 foot) long it can be used as beginning of row two. If the room is a rectangle and your boards are all the same lengths it is best practice to cut some boards in 1/3, 1/2 and 2/3 lengths (make sure you are left with the short end tongue on that part you want to use!) to start a new row in order to prevent creating a repeating pattern every two rows.

Install the rest of the room (install next rows of underlayment as you go, with Combi-underlayment make sure the overlapping self-adhesive strip fits correctly underneath the next row of underlayment).
Glue both long side and short side grooves of all boards before slotting them in place, make sure to glue the whole of the groove length, not just drops here and there.
Remove any excess adhesive with the damp cloth as soon as possible. When needed use knocking block and/or installation bar for a tight fit and keep checking those joints. Place spacers at the end and beginning of some of the rows to keep your expansion gap the same everywhere.
Don’t walk over the just installed boards.
Take a well-deserved coffee or tea break after you installed row four so the glue gets time to bond. Then carry on with the rest of the floor.

Tackling the last row. Not a nightmare (not with standard T&G boards anyway), but common sense and patience will get you there.
You can use the same trick of the trade to cut the exact width for this row (per board), leaving a correct expansion gap and a correct fit.

Remove all packaging and leftover boards etc from the room. Vacuum clean (or use a soft broom) the room to remove all sawdust and little pieces of wood before they can damage the floor when treaded on.
Remove spacers and install scotia, beading or skirting boards in place. Careful with lost/dropped nails or pins; undetected and treaded on they can damage your floor before you’ve even finished.

Remove everything from the room (tools etc) and vacuum clean again. Wait 2 –3 hours before placing furniture back (put felt pads underneath legs to prevent scratches), this way the glue gets time to bond and walking and moving around will not open any boards to create gaps (Murphy’s law: normally in the middle of the room.)

When in doubt, call you supplier or manufacturers help-line.

As mentioned before: these are BASIC tips; all rooms, circumstances vary.
In most other situations the best tip is to think ahead, use common sense and patience. Or feel free to post your specific questions or own experiences here (use the comment link underneath)

Did you install your wooden floor yourself and are you darn proud of it? Enter our DIY-Triumphs contest!

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Comments

Hi there,
I have got to lay flooring through out the entire ground floor of a house, is there a sequence to laying the solid flooring with four different lengths.
Thanks Terry

Hi Terry

Not specifically. It's even better to avoid a repeating sequence for the following reasons:
a) will look odd in the end (artificial)
b) might create a pattern every two three rows making the whole floor unstable (i.e. prone to more movement).

hi there , just bought parquey flooring,and im laying it (brick affect), plus my room is an odd shape , jus wondering is there a serting place to start
thanks chris

Hi Chris

Depends in fact on how odd the shape of the room is (not straight walls, octangle?). Best is to try to imagine how the pattern would look near the walls if you would start in the exact middle of the room.

Best 'direction' would be where you enter the room to have a 'normal' focus point for the eyes.

Wood You Like Ltd

Lifted old parquet flooring. How can I remove bitumen before laying?

Dear Audrey Scott

With a lot of elbow grease I'm afraid.. Chisel off as much as possible and remove last bit with petrol - kerosine (very, very careful with this!!!!)
Any residue of bitumen will effect the bonding time of any modern adhesive type (like Lecol5500 or B92 Stycobond): instead of 4 - 5 hours it can take up to 24 hours before it holds properly and you can sand over it.

Wood You Like Ltd

Hi there
We've jsut built a new house and have had the heating on for the past number of weeks. We tested the moisture level of the concrete the flooring will go on at it's currently 4%. The wood for the floor has been in the house for the past 2 weeks.
Would we be okto go ahead and lay the flooring now?
Thanks Avril

Dear Avril

You have to wait a bit longer we're afraid. The moist level in the concrete should be 2% or less before you can install the wood floor.

Rule of thumb: every inch (2.5 cm) of concrete/screed takes approximately 30 days to dry.

Wood You Like Ltd.

In that I am totally inexperienced at this, I humbly engage your patience.

Would I need to remove the old flooring before laying the new or could I do a layover? My house was built in 1911; the panels have not been changed since the origination

Thank you

Dear Bobby.

If your existing floorboards are level (un-cupped and sound) you can install your new floor on top of it without any problems.
We recommend you use a foam underlayment for sound-insulation, leave expansion gaps al around of min. 10mm.

Hope this helps

Wood You Like Ltd

Hi, Silly question but I've been reading loads about how to install a wooden floor onto an existing wooden floor and I'm probably going to try the secret nailing method. (Here comes the silly question)...Do I have to nail all the floorboards? I only ask because I was wondering, how will the floor be able to expand and contract if it's nailed to the floor underneath?? Sorry if this sounds really daft but just want to clarify the situation.
Many thanks
Chris J

Hi Chris

First of all, silly questions don't exist (only silly answers ;-))

Yes, you do have to nail all boards (every 40 - 50 cm but at least two nails per board) otherwise when the floor expands or shrinks the 'loose' boards can buckle or cup more easier.
Wood expands/shrinks due to changes in air-humidity during the various seasons, no matter what method you use for installation. The nails will hold them in place better to prevent gaps (when shrinking) or cupping (when expanding).

Hope this clarifies it for you

Wood You Like Ltd

i'm going to lay a real wood floor on concrete in hallway & joists in other 2 rooms any tips most appreciated as i've only laid laminate in the past

Hi Andy

Can I first redirect you to three other articles? If you still have further questions by all means ask them here again.

Installing floors onto joists
Type of underfloor is type of underlayment
and
One type of underfloor

Wood You Like Ltd

Hi,
I would like to put down solid oak flooring upstairs on top of the existing floor (90mm-18mm – various lengths). I am going to level the existing floor with layers of hardwood plywood and I am thinking of putting 6mm fibreboard underlay for acoustic reasons. I am considering a floating installation, however, a number of websites state that NO solid wood flooring can be floated.
Hoverer, if it is suitable for floating do you think it will:

# reduce the amount of squeaks and creaks that hardwood floors develops over time,
# be as long lasting as the nail down or glue down floor.
# have some important advantages and disadvantages to the other fitting options.

Thank you in advance.

Best,

Konrad

Hi Konrad

The opinions on floating solid wood floors vary indeed. We - and our manufacturers - have no problem with floating solid wood floors, as long as certain rules are followed.

One of them is - unfortunately for you in this case - the width of the boards: narrower than 110mm means glueing them down.
You can use the same preparations you're planning now, use a suitable parquet adhesive and fully bond the floor to the subfloor you've made.

Wood You Like Ltd

Thank you very much for your help. I am inclined to go with your excellent suggestion. I would like to have a stable floor but I am also concerned with the footsteps sound (expecially upstairs).
Just one more query if you don’t mind. From the DIYnot forum I learned that you are familiar with the Sika Silent Layer Mat installation. With this method, being a semi-floating one, do you think I can:
# install the floor continuously between rooms without dividing up the floor;
# install sliding door wardrobe on it.

Great thanks again.

Regards,

Konrad

Hi Konrad

The Sika Silent Mat is one solution indeed. Another one would be the Elastilon 'self-adhesive' sound-insulation underlayment.

Wood You Like Ltd

Hi,
Thank you for your reply. Regarding the Elastilon underlayment or the Sika mat: would they act like DPM causing the existing wooden subfloor to sweat?

Hi Konrad

The Elastilon comes without DPM and is therefore very suitable to use on existing floorboards or 'subfloors' of sheet material like plywood or chipboard.
We suggest you use the Elastilon 'Strong' which is the most suitable for narrow strips.

Wood You Like Ltd

Hi,

really good information on your site...
We plan to put a solid wood floor (140mm wide oak planks) onto a concrete floor. House is 8 years old. Planning to do 3 adjoining rooms total of 42 m square. We've been given different advice - some fitters say glue straight to concrete, some say use underlay and glue planks together. Could you give us any advice on this, any help much appreciated.

Hi Hels

Both methods are suitable. Glueing the solid floor down depends on the condition and quality of the concrete underfloor (the 'weakest link')

We ourselves prefer the floating method (when the room isn't wider than 5 meters wide), installing a combi-underlayment and glueing (with PVAC wood-glue) all Tongues and Grooves.

Leave sufficient expansion gaps around the perimeter of the floor.

Hope this helps

wood You Like Ltd

hi

i am going to be laying a solid wood floor on concrete that is very old - 40 yrs min i think. i have a few questions:

i want to face fix and glue onto 12mm ply. what is the best glue to use?

i will be laying the air bubble and foil insulation which is 4mm thick under the ply. do i need to lay acoustic underlay on top of the ply?

i hope to use 180mm sawn oak boards - planks basically with no t&g. do i need to do anything special with this type of wood ?

what is the difference between this wood and t&g. is the t&g option better ?

thanks very much for your help.

Hi John Paul

If you glue down you can't use another underlayment between ply and boards. The best adhesive to use would be a flexible adhesive (like Sika T54, Lecol MS250 or Mapei P9910K)

Make sure the Oak boards are dried to floor standard (moist content in the wood between 9 - 11%) and can acclimatise in the room you plan to have them installed in.

Difference between your boards and T&G boards: T&G's can be installed floating, secretly nailed or fully glued down, boards without T&G should be glued and pinned down (as you plan to do).

Hope this helps

Wood You Like Ltd

Hi we are going to lay soild wood flooring from the hall into the kitchen, then put new skirting boards on so we dont have to use any trimming around the edges but I'm wondering what do we do when it comes the door ways? How do we do the edging in the fram of the doors, as we obviously can not put skirting there!

Please Help!

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