For larger decking projects where strength and span matter, Decking 150 x 35 x 4.5m Treated Timber offers durability, stability and long-lasting outdoor performance. Manufactured from quality softwood and pressure treated for exterior use, this board is designed to resist rot, fungal decay and insect attack — making it well suited to Ireland’s damp and changeable climate.
The 150mm width and 35mm thickness provide a solid, sturdy decking surface with excellent load performance, while the extended 4.5 metre length helps reduce joints across wider deck areas for a cleaner, more seamless finish. Ideal for garden decking, raised platforms, boardwalks and outdoor entertaining spaces, this board combines practical strength with a natural timber appearance that can be stained, oiled or sealed to suit your project.
Whether you’re working on a new build, landscaping job or replacing existing boards, this treated decking timber delivers reliable results for both trade professionals and DIY installers.
Key Features
Pressure Treated Timber: Protection against rot, decay and insect attack
Heavy-Duty Profile: 150mm x 35mm for strong structural performance
Long 4.5m Length: Fewer joints and cleaner deck lines
Exterior Ready: Designed for outdoor above-ground applications
Versatile Finish: Suitable for staining, oiling or sealing
Technical Specification
Product Type: Pressure Treated Decking Board
Nominal Dimensions: 150mm x 35mm
Length: 4.5 Metres
Finished Size: May be approx. 4–8mm smaller after machining
Fixings Recommended: Stainless steel or exterior-grade galvanised decking screws
Installation Note: Allow 5–7mm spacing between boards for expansion and drainage
Maintenance: Periodic sealing, staining or oiling recommended to extend service life
Common Uses
Garden decking areas
Raised decks and platforms
Boardwalks and pathways
Balcony decking (with suitable subframe support)
Landscaping and garden features
Step treads and deck stairs
TJ’s Tip
Because of the longer board length, ensure your joist spacing is correct and evenly supported to prevent bounce or movement. Always use corrosion-resistant fixings to avoid staining and maximise lifespan in exposed outdoor conditions.
We offer reliable delivery services throughout the Republic of Ireland, with straightforward delivery charges for both trade and DIY customers. Delivery options are confirmed at checkout based on your order and delivery Eircode.
Delivery Charges & Delivery Times
Delivery Type
Delivery Area
Delivery Charge
Delivery Time
Small Items
Republic of Ireland
€9.99
3–4 working days
Large & Heavy*
Standard delivery area
€29.99
5–7 working days
Extra Large*
Standard delivery area
€50.00
5–7 working days
Paint 5L or less**
Standard delivery area
€19.99
5–7 working days
Swipe sideways to compare delivery options.
Small Items
Delivery area
Republic of Ireland
Charge
€9.99
Delivery time
3–4 working days
Large & Heavy*
Delivery area
Standard delivery area
Charge
€29.99
Delivery time
5–7 working days
Extra Large*
Delivery area
Standard delivery area
Charge
€50.00
Delivery time
5–7 working days
Paint 5L or less**
Delivery area
Standard delivery area
Charge
€19.99
Delivery time
5–7 working days
*Standard delivery policy. Promotional delivery rates may apply during campaigns.
Additional Information
FREE delivery on eligible Small Items and Large & Heavy orders over €1,499, within the standard delivery area only.
Special Order and Catalogue Products require an additional 5 working days.
FREE collection of old appliances is available through WEEE Ireland when purchasing qualifying large appliances.
FREE Click & Collect is available for items in stock at your selected branch.
Large & Heavy and Extra Large items are available within our standard delivery area only.
Paint delivery Paint in tin cans 5L or less is available for delivery. Larger sizes and paint supplied in plastic buckets are available for Click & Collect only.
TJ O'Mahony offers a 30-day returns policy on eligible unused products, giving you additional time beyond the statutory 14-day cooling-off period applicable to most online consumer purchases.
Eligible products can be returned for a refund or exchange within 30 days of delivery or collection, provided they are unused, in their original and re-saleable condition, complete with all supplied parts and accessories, and accompanied by proof of purchase.
Please note: Return restrictions apply to certain products, including Mixed Paint, certain Bagged Building Products, Solid Fuel, Special Order, Non-Stock and Catalogued Products.
Your statutory rights in relation to faulty, damaged, incorrectly supplied or non-conforming goods are not affected.
