Timber Decking Range | Treated Decking Boards, Joists & Accessories
Build a durable and attractive outdoor space with our timber decking range, featuring high-quality, pressure-treated boards and all the essential components for a complete decking system. Whether you're constructing a garden patio, raised deck, or commercial platform, our treated timber is built to last.
✅ Treated softwood decking boards – grooved and smooth profiles
✅ Decking joists & subframes – UC4 treated for ground contact
✅ Handrails, spindles & newel posts – perfect for balustrade systems
✅ Decking screws & fixings – rust-resistant and long-lasting
✅ Available in a variety of lengths and sizes
Ideal for landscapers, joiners, and DIYers, our decking timber offers strength, style, and ease of installation. Nationwide delivery available on all decking supplies.
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100mm x 47mm (4"x2") joist, square sawn
Alter Supplies5.0 / 5.0
2 Reviews
100mm x 47mm (4"x2") Joist, Square Sawn Enhance your construction projects with our durable 100mm x 47mm joists, available in various lengths ...
View full detailsRedwood Decking Treated 145mm x 28mm - 3.6m, 4.8m, 5.4m lengths
Alter Supplies4.75 / 5.0
4 Reviews
Upgrade your outdoor space with our high-quality Redwood Decking. Made from treated redwood, it is durable and resistant to rot and decay. Availab...
View full detailsRegularised 125 x 47 (5 x 2) Joist KD C24 in 4.8m & 3.6m
Alter Supplies125mm x 47mm Regularised C24 joist @ 4.8m & 3.6m long, pressure treated green, dressed, kiln dried. Used for general construction purposes or d...
View full details150mm x 47mm (6"x2") Joist, square sawn
Alter Supplies150mm x 47mm (6"x2") Joist, square sawn Enhance your construction projects with our 150mm x 47mm (6"x2") Joist, pressure treated in an att...
View full details1.25M x 82 x 82mm Redwood Chamfered Decking Post Newel
Alter supplies1.25M x 82 x 82mm Redwood Chamfered Decking Post Newel Enhance your outdoor space with the 1.25M x 82 x 82mm Redwood Chamfered Decking Post...
View full detailsRedwood Decking Spindle R4A Treated
Alter Supplies42*42*900mm Redwood Decking Spindle R4A Treated
Redwood Decking Baserail Treated 4.2 x 78 x 38mm
Alter Supplies4.2M x 78 x 38mm Redwood Decking Baserail Treated
Redwood Decking Handrail Treated 4.2 x 75 x 33mm
Alter Supplies4.2M x 75 x 33mm Redwood Decking Handrail Treated
Redwood Decking Fillet Treated 4.2m x 45 x 12mm
Alter SuppliesRedwood Decking Fillet Treated 4.2 x 45 x 12mm