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Types of Carcassing Timber

carcassing timber
What is Carcassing Timber?

Carcassing timber is a term used to refer to timber processed for use in structural applications including floor joists, roof battens, roof trusses, cladding, decking supports and studwork for partitioned walls.

Types of Carcassing Timber

Structural timber comes in a wide range of strengths, sizes, and lengths and can be treated with a preservative or left untreated depending on the project.

Here are the different types of carcassing timber:

  1. Treated regularised kiln dried C16

This type of timber is used for structural applications including timber framing, floor/ceiling joists, and roof rafters. It is also ideal for use in general construction where load-bearing is required.


  • Is regularised for dimensional consistency and to ease handling
  • Strength graded to C16 for structural performance
  • Is kiln dried for a better-machined finish and greater stability
  • Pressure treated to prevent rot and decay
  1. Sawn kiln dried C16

This timber is used in load bearing projects and internal building work including mid-level flooring joists and partitioning.


  • Is graded to C16 strength for structural use
  • Planed to regular widths for accuracy
  • Slow grown for higher strength and durability
  1. Treated sawn

Treated sawn timber can be applied in different construction projects including stud partition for walls, floor/roof joists, and general joinery. The timber can also be used in applications where extra protection and lifespan is required. These applications include outdoor or garden projects such as repairing a shed and trellis work.


  • Treated to protect against fungal attack
  1. Sawn kiln dried

Sawn kiln dried timber can be used in internal construction projects such as framework and boxing in pipes.


  • Is slow grown for better strength and durability
  • kiln dried for greater stability
  1. Treated studwork

This timber works well in general structural applications including stud wall partitioning.


  • Pressure-treated to protect against fungal and insect attack
  • Is regularised for dimensional consistency
  • Is graded to C16 for use in applications where support and load bearing is required
  1. Studwork

Studwork timber is ideal for use in wall partitioning, particularly in high moisture areas such as basements.


  • Is rounded on four edges for easy handling
  • Is graded to C16 for applications where support and load bearing is required
  1. Roof battens

Roofing battens provide a good fixing point for roofing sheet and tiles.


  • Is pressure treated to protect against decay
  • Pre-graded to comply with BS5534
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