Complete Guide to Timber
From structural framing to finishing touches, timber is essential in construction. Our guide covers timber grades, treatments, and helps you find the best prices from UK suppliers.
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Timber Grades
C16 is the standard structural grade for most applications. C24 offers higher strength for demanding structural work. CLS (Canadian Lumber Standard) is pre-finished with rounded edges, ideal for stud walls. Regularised timber is planed on all four sides for consistent dimensions.
Timber Treatments
Untreated timber is suitable for internal use. Pressure-treated timber resists rot and insects for outdoor or ground-contact applications. Fire-retardant treatments are available for specific building requirements.
Buying Tips
Order lengths slightly longer than needed to allow for cutting. Check moisture content for your application. Treated timber needs time to dry before painting or staining.
Helpful Calculators
Frequently Asked Questions
Standard stud walls use 89x38mm (3.5"x1.5") CLS timber for studs and 89x38mm for head and sole plates. For load-bearing walls, consult a structural engineer.
C24 is a higher strength grade with tighter grading requirements. It's used where greater structural strength is needed. C16 is suitable for most domestic construction.
Yes, timber in contact with or near the ground should be pressure-treated to prevent rot. Look for UC3 or UC4 use class ratings for ground contact.