Grainel Thermowood Wall Panel Installation Guide

Ensure the installation surface is suitable before the first panel is fixed.

• The surface should be dry.
• The surface should be clean.
• The surface should be level.
• The substrate must be strong enough to support the panels.

Decide whether the panels will run horizontally or vertically before starting work.

• Arrange several panels in advance to evaluate texture, color variation, and lighting.
• Choose the direction that gives the most balanced visual result in the room.

Use a spirit level and measuring tape to mark the first row precisely.

• A straight starting line helps keep the entire installation aligned.

Open the packages and lay the panels on the floor with the finished side facing upward.

• Each panel is unique and may vary in color tone, texture, and pattern.
• Alternate different-looking panels during installation for the best visual appearance.

Separate full-length boards from boards that need to be trimmed before fixing them in place.

• Minor micro-cracks may occasionally appear at the ends of thermowood panels.
• Use such panels at full length whenever possible, since cutting can extend the crack.
• After cutting, smooth the cut edges with a sanding block.

Follow the tongue orientation carefully so the panel can be nailed cleanly.

• Horizontal wall installation: preferably work from top to bottom with the tongue facing downward.
• Vertical wall installation: work from left to right with the tongue facing right.
• The offcut from a trimmed panel can be used to start the next row where suitable.

Clean the connection points before joining panels and fasten through the tongue edge.

• Clean the tongue and groove before connecting the panels.
• Use a nail gun at approximately a 45° angle.
• Drive the nail through the inside corner of the tongue edge.
• Set nail spacing according to the substrate and installation conditions.