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Fitting an engineered wood floor

If you are fitting an engineered wood floor with underfloor heating, please check the relevant underfloor heating guide.


Before commencing installation ensure the requirements have been met for Jobsite Conditions, Moisture Testing, and Acclimatisation.


  • Concrete
  • Panel
  • Plank
  • Joists (20mm only)
  • Tiles


  • Glued
  • Floated
  • Nailed (20mm only)


Choose a starting wall according to the most aesthetically or architecturally important elements in the room, taking into consideration fireplaces, doors, cabinets and transitions, as well as the squareness of the room. The starting wall will often be the longest unbroken wall in the room.

Engineered wood floors can be glued or floated to the existing sub floor. 20mm thick wood floors can be nailed to timber sub floors.

Ensure a vapour retarder has been applied unless with the use of under floor heating.

Careful attention must be paid to the maximum area of the installation.

Do not float engineered floors where the dimension of an installation area exceeds 6m in width and 10m in length. If these dimensions are exceeded glue the flooring using Ted Todd’s MS Flex adhesive.

For glue or nail installations where the maximum width exceeds 8m, extra expansion should be allowed in between the rows of the boards allowing 1mm of extra expansion for every meter exceeding the maximum width. For example a 10m wide room will require an extra 2mm of expansion distributed across the floor.

Where possible, expansion gaps must be left though doorways/archways and covered with T sections to break up large areas of installation and a minimum expansion space of 15mm must be left around the perimeter and all vertical obstructions.

Distribute lengths of planks, avoiding ―H‖ patterns and other discernible patterns in adjacent runs.

For multi-ply engineered flooring there is frequently a bow within the board. This can be up to 25mm and therefore it is important to ensure that the first rows are laid with the boards being interlocked to around half of the length. This will ensure the boards lie flat and permit installation.


Unless there is water fed under floor heating system installed apply 2 coats of Ted Todd Primerfast liquid damp proof membrane.

Tiles will require to be abraded and quartz crystals applied to the wet Ted Todd Primerfast before installation.

Snap a working line parallel to the starting wall, the width of the board, plus the tongue and recommended expansion space.

Install a starter board along the edge of the working line and begin installation.

Alternatively, lay one row of plank in Ted Todd MS Flex along the length of the working line and allow curing before starting the installation.

Please refer to Ted Todd MS Flex and Ted Todd Primerfast data sheets for more information.

Spread the adhesive as instructed up to and along the working line. Use tensioners to maintain a tight floor.


Only 20mm thick engineered wood floors can be nailed.

This can be over any wood subfloor, see acceptable subfloors for more information.

Our 20mm floor are ends matched, when installing over joists at 450mm centers there is no requirement to support head joints on a joist for normal domestic installations. If heavier point loading is expected all header joints should be supported.

If installing over a solid subfloor, planks must be laid at 45 or 90 degrees to sub floor boards or add a layer of minimum nominal 12mm Class1 plywood underlayment to the existing subfloor.

Always use Sisalkraft underlay with all nail down installations, overlapping the seams by a minimum of 100mm and returning up the wall.

Snap a working line parallel to the starting wall, allowing 15mm expansion space. Lay one row of plank along the entire length of the working line.

Top-nail and blind-nail the first row (hand-nail if necessary), using appropriate fasteners. Denser species may require pre-drilling. Each succeeding row should be blind-nailed wherever possible.

  • Joists subfloors – Blind nail in each joist
  • Plank or Panel subfloors – Nail every 200 – 300mm

During installation of flooring, push or gently tap boards flush to the previous row. Tap against the tongue; tapping the groove may damage the edge. To prevent damage to the finish, avoid tapping the face of the board with a rubber mallet.


Do not install fixed items over floated engineered floors i.e. kitchen units or islands.

Do not float engineered floors where the room dimensions exceed 6m in width. Follow glue down installation method.

Install acceptable vapor retarder, taping all seams with aluminum tape.

Use Ted Todd Universol underlay over under floor heating systems.

Ted Todd Floor Fix Float Professional underlay with all other systems.

Apply Ted Todd T&G Adhesive to top of tongue on lengths of boards and head joints ensuring the boards are clamped while the glue is left to cure