Start preparing for the paneling work by cleaning the floor surfaces. This ensures that there is no debris or litter on the floor. Any foreign matter left on the floor may damage the finished floor when trestles are used.
Use careful consideration to choose the method of attaching the panels before beginning the work. Face nailing provides strong attachment, but the nails need to be lined up carefully to achieve a neat result. Blind nailing, on the other hand, is an easy way to achieve a neat finish. However, especially when using wide panels, you must always ensure that the attachment is secure enough, as fluctuations in the moisture levels will cause the wood to move, which may result in the panels coming loose.
Start the paneling from the ceiling. Begin by measuring the run of the ceiling (i.e. the width of the area to be paneled). Then, narrow the first panel down to the same width as the last panel. This allows you to avoid a situation where the first panel in the ceiling is at the full width and the last one only a narrow strip.
Cut the first panel on the side of the tongue so that the groove is left facing you. Leave a gap of at least 5 mm between the fist ceiling panel and the nailing strip on the wall. This allows the ceiling panels to expand and contract freely as the moisture level fluctuates. Check the run as the work progresses to ensure that the paneling is even and the panels are not wedging into each other. If the dimensions are not exact, correct them evenly. Do not use the last panel as a wedge.
Start the wall paneling installing moldings in the corners. Cut the moldings to the length of the area to be paneled and attach them lightly to the nailing strips. Start the paneling at the top. Narrow down the first panel by cutting off at least the tongue. However, you should check the run of the entire wall and make the first panel even more narrow, if it looks like the width of the bottom panel might be less than 30 mm. It is difficult to attach such narrow strips, and this deviation may also be visible in the finished sauna.
Install the first panel on the wall with the groove facing down. Leave a gap of 3 to 5 mm between the ceiling panel and the wall panel to allow the passage of air. As the work progresses, it is good to keep checking the run and the straightness of the installed panels. If there are any deviations, correct them evenly. Panel all the walls at the same time by proceeding around the room. This way, you can avoid a situation where the surface patterns of the panels on adjacent walls do not match each other in the corners.