Building a floor using WISA spruce plywood


Easy subfloor installations
with durable plywood

WISA spruce plywood is resistant to wear and tear. It is also light to handle and easy to install.

Bring the panels to the installation area at least 24 hours before you begin building the floor. This ensures that the plywood becomes accustomed to the temperature and humidity conditions and is sufficiently dry to be installed. Use the required working clothes and protective gear, such as eye protection and work gloves, when installing.

Build the foundations well in order to make installation easier. Build the frame of the floor with a span of 400 or 600 mm if the panel is 2400 x 1200 mm. Remember to support the flooring especially near the walls.


Prep and plan

Begin installing the flooring from a corner, starting with a full-length panel. Place the panel on top of the supports which run parallel to the wall. The tongue is placed towards the wall.

With the help of a wedge, leave a gap of about 5 mm between the wall and the plywood.

See that the short edge of the plywood is placed on top of a support. Install one panel at a time and make sure that the tongues and grooves go where they should. Saw the last panel in the row to the appropriate size.


Fix with glue

Use a suitable glue to further fix the panels in place. 


Tap gently to tighten the seams

Tighten the joint by gently hammering the tongued and grooved piece, but never hit the edge directly as it might destroy the edge. 


Attach with appropriate gaps

Use countersunk screws for fixing, the length of which should be 2.5 times the thickness of the plywood panel. 

Attach the panel using screws in such a way that the gap between screws is 150 mm at the edges and 300 mm at the center, where the support beams are. The screws must be at least 10 mm away from the edge of the panel. 


Continue installing on support beams

Once you have finished the first row, follow a staggered pattern in the style of bricklaying. You can use a shorter panel to start the new row. Please note that the panel should be long enough to reach three support beams.


Rigid and resistant floor ready to be finished

The completed floor has no sills, and it is ready for the installation of the desired final surface.