: Nominal dimensions are typically set for moisture levels of 15% or 20% .

: For timber with mixed grain orientation (tangential-radial), shrinkage values are provided for final moisture contents ranging from 5% to 37% . Reference Tables

Because this is a technical legislative document, the full text—including the precise mathematical tables—is best viewed via official PDF repositories: : Rosstandart (Russian) Full Text (PDF) : Meganorm or Stroyinf Annotated Version : Docs.cntd.ru

The full document contains several critical lookup tables used by manufacturers:

: If the wood's moisture content is higher than the standard nominal moisture level, the actual dimensions must be larger than the nominal ones by the established shrinkage value.

The standard applies to softwood lumber (coniferous wood) produced via tangential, radial, or mixed sawing methods. It establishes mandatory shrinkage allowances for thickness and width to compensate for volume loss during the drying process.

Below is a summary of the core text and requirements based on official documentation from sources like Rosstandart and Docs.cntd.ru .

: Shrinkage values for thickness and width based on final moisture content.