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Items 1-12 of 16

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About Treated Graded Timber

Here at Harlow Bros, we supply a range of treated graded timber to your specifications.

The majority of our graded timber comes in both C16 & C24 specifications and is regularised & kiln-dried with eased edge for better handling. This helps to reduce the moisture content to 20% less than standard timber, keeping it in line with building regulations and making it an ideal material to use in a construction project, with these specs often being designated within construction projects by architects.

Kiln-drying also helps to improve the timber's strength and durability against things such as cupping, warping or twisting. Our graded timber is treated with protection against mould, fungi and infestation. We pressure treat all our timber in our own site treatment tanks, so the treatment penetrates the timber further.

We can also offer timber not treated by kiln, in all section sizes, typically preferred for builds in which moisture content is not a concern, for example, with fencing, landscaping projects or if an architect has not designated graded timber is needed.

Our graded timber is only sourced from sustainable, certified, responsible sources, and we do our best to relieve our environmental impact as much as possible.

Get high-quality, treated graded timber today!

Graded Timber Cut To Size

Our graded timber comes in a range of pre-cut options, so you can easily purchase the right size for your project. Some of the sizes we offer include:

  • 50 mm
  • 75 mm
  • 100 mm
  • 150 mm
  • 200 mm

Much of our treated graded timber stock is pre-graded; however, we have a team of expert graders who can visually grade timber to your specification. If you want something bespoke, please get in touch with us to explore your options.

Why Shop For Treated Timber With Harlow Bros

Harlow Bros is passionate about ensuring our customers get the best customer service possible. We have been supplying the nation with fantastic timber since we opened our doors in the 1920s, and we continue to pride ourselves on the quality of our products.

When you buy your treated graded timber with us, you can rest assured that you'll receive an outstanding product that will be an asset to your construction project.

Get only the best when you shop with Harlow Bros.

Our Other Building Grade Timber Options

If you are looking for another building-grade timber, we have a fantastic selection available here at Harlow Bros. Some of our other options include the following:

We have a vast selection of timber and joinery products available in various sizes and thicknesses to suit your demands.


What Is Treated Timber?

Treated timber is wood that has been chemically preserved and tanalised to protect it from decay, insects, and other destructive agents.

How Is Timber Graded?

Timber is graded based on the quality and strength of the wood, as well as its weaknesses, such as knots or fissures. The grade of the timber is determined by visually inspecting the wood and evaluating its characteristics, such as knots, twists, and other defects.