Pine Flooring: Floating vs. Glue-Nail Installation

The choice between floating and glue-nail installation for solid pine flooring remains a key consideration for French builders. However, the optimal method hinges primarily on the existing subfloor and the specific characteristics of the pine planks themselves.

Thickness and Floating Considerations

Solid pine planks, typically ranging from 20 to 23mm thick, present a challenge for floating installations. The wood's natural expansion and contraction due to humidity and temperature fluctuations can lead to significant stresses, which simple clipping cannot always adequately manage over time. While some manufacturers offer specialized floating pine planks with interlocking features, these are relatively uncommon.

NF DTU 51.11 and Planarity Tolerances

The NF DTU 51.11 standard, revised in 2023, dictates strict flatness tolerances for floating floor installations. Many older subfloors or existing wooden floors do not meet these requirements without a prior leveling process. This significantly impacts renovation projects, as floating floors amplify imperfections in uneven subfloors, resulting in uncomfortable “springiness” and creaking noises.

Pine’s Suitability for Glue-Nail Installation

Due to its softer nature compared to hardwoods like oak, pine requires a specific approach to glue-nailing. The nails or staples must be appropriately sized to avoid splitting the wood along the tongue. Overly aggressive nailing can damage the wood, while insufficient nailing allows for excessive movement. Recommended spacing between joists should account for pine’s natural flexibility, typically around 30-40cm depending on the plank thickness.