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Decking 150 x 35mm x 4.2m Treated Timber

Decking 150 x 35mm x 4.2m Treated Timber

Product Code

04D1503542

Timber sizes are nominal and will reduce after machining.

Resulting in the finished size being 4mm to 8mm smaller than advertised.

(Some sizes are not listed online, please contact us for details.)

From €17.50 €14.23

/ Price Per LENGTH

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More Information

For strong, durable outdoor surfaces that stand up to Ireland’s unpredictable weather, Decking 150 x 35 x 4.2 m Treated Timber is a reliable choice for both trade professionals and DIY builders. Made from pressure-treated timber, this decking board is designed to resist rot, decay and insect attack — making it ideal for patios, garden decks, walkways and entertaining areas.

At 150 mm wide and 35 mm thick, this robust board provides a comfortable underfoot surface and excellent structural performance across long spans, while the 4.2 m length helps minimise joints and waste on larger projects. Timber sizes are nominal and may reduce slightly after machining, so you can expect a finished size approximately 4 mm to 8 mm smaller than advertised.

Pressure treatment gives this decking timber enhanced protection against moisture and biological decay, helping to extend its lifespan with proper installation and maintenance. Whether you’re building a new deck from scratch or refreshing an existing outdoor platform, this treated decking board delivers value, strength and classic timber aesthetics that can be stained or finished to suit any outdoor design.

Key Features
- Durable Pressure-Treated Timber: Protection against rot, decay and insect attack for outdoor use.
- Generous Size: 150 mm wide and 35 mm thick for a sturdy deck board profile.
- Long Length – 4.2 m: Reduces joints and waste across larger decking areas.
- Nominal Sizing: Finished dimensions may be slightly smaller after machining — always allow for this when planning.
- Versatile Outdoor Use: Perfect for garden decking, patios, walkways and outdoor platforms

Technical Specification

Product Code: D1503542
Product Type: Pressure Treated Decking Board
Nominal Dimensions: 150mm x 35mm
Length: 4.2 Metres
Finished Size: Approximately 4–8mm smaller after machining
Timber Type: Softwood
Treatment: Pressure Treated for external use
Use Class: Suitable for above ground exterior applications
Application: Decking, patios, garden platforms, walkways
Fixings: Use exterior-grade or stainless steel decking screws
Installation Note: Allow adequate spacing for expansion and drainage

Ideal Applications

Residential & commercial decking
Patios and outdoor entertaining zones
Garden walkways and pathways
Elevated decks and platforms
Garden Beds & Planters

TJ’s Tip

When installing, leave an appropriate gap between boards to allow for natural timber expansion and drainage. Use corrosion-resistant fixings designed for decking to ensure long-lasting performance — especially in exposed outdoor conditions. Regular sealing or oiling will help maintain appearance and protect against weathering over time.

Specs

More Information
Thickness (Timber)	35 - 39mm (1.5")
Dimensions (Timber)	6x1.5 (150x35mm)
Width	150mm (6")
Length	3.6M (11.8')
Brand	TJ O'Mahony
Weight	6.0000
Product Size	150 x 35 x 3600mm
Provided by	Not Assigned
Delivery Rule	large & heavy

Delivery

Last update: 02-Dec-2025

Delivery Timeframes:

Small Items: 2-3 working days
Large/ Bulky items: 5-7 working days
Extra Large appliances & TV's: 5-7 working days
Click & Collect: 1 working day

Delivery Zones (Nationwide):

Zone 1: Dublin, Galway, Kildare, Limerick, Meath, Offaly, Tipperary, Wexford, Wicklow
Zone 2: Carlow, Clare, Clifden, Kilkenny, Laois, Louth, Waterford, Westmeath
Zone 3: Cavan, Cork, Donegal, Kerry, Leitrim, Longford, Mayo, Monaghan, Roscommon, Sligo

Delivery Charges:

	Small & Light	Large & bulky	Extra Large
Zone 1	€9.99	€25	€50
Zone 1	Free delivery on orders over €400		no free delivery

Zone 2	€9.99	€50	€50

Zone 3	€9.99	N/A	N/A

* Effective from 3 December 2025
* Free delivery on order over €400, applies to Small & Light, Large & Heavy items within zone 1 only.

Zone Indicator:

To help you understand delivery availability, every item displays a zone icon, icons appear on the top-right corner of each product image:

Types of goods	Available zones	Descriptions
Small & light items	All Zone area	Items under 20kg weight & under 2m long, (some fragile items may not be included e.g. glass/mirrors)
Large and bulky items Extra Large items	Zone 1 & 2 only	Wet & hazardous bagged, items over 20Kg weight & oversized; Euronics white goods, TVs of all sizes.
Large Paint items (6L / 6L+)	Zone 1 only	Large hazardous items (6L+) - available for collection

Available zones	Indicator	Descriptions
All zone area		This icon with all zone area in green, indicates this items can be shipped to all Zone.
Zone 1 & 2 only		Zone 1 & 2 in green and zone 3 greyed out, indicates this product can only be shipped to Zone 1 and 2
Zone 1 only		Zone 1 in green zone 2 and zone 3 are greyed out, indicates this product can only be shipped to Zone 1 only.

Old Appliance Collection:

When you buy a large appliance, we’ll collect your old one for free through WEEE Ireland. Please ensure it is uninstalled, disconnected, and ready for pickup. Collection is like-for-like and takes place at the front door or apartment entrance. Restrictions may apply based on access and item type.

Free Click & Collect:

Click & Collect is free and available on items in stock at your chosen branch. Click Here to see our Branch Locator.

How it works:

Place your order online
You will receive an order confirmation email
Our team processes your order, please allow up to 4 hours
Within branch opening hours, we aim to have your order ready the same day.
You will receive an email once your order is ready for collection.

Returns

At TJ O'Mahony we will exchange or refund any Retail unused product returned to us in its original condition within 30 days of receiving it (*)You can return any unused product to us in its original condition for a full refund or exchange within 30 days of delivery.

This right to return does not apply to products that are non stock and only available to order such as catalogued doors, catalogued bathroomware and mixed paints which are made especially for your order.

Please note that we are unable to accept returns on certain bagged building products and materials, including (but not limited to) hard wall, cement, bonding, slates, and ridges. We appreciate your understanding and recommend checking product requirements carefully before purchase.

*View our full returns policy on our Terms &Conditions Page.