quality decking materials from established decking suppliers

Want to create a space in your garden where you can relax and enjoy a lazy afternoon? Get in touch with the decking suppliers at A. Diamond & Son. We supply timber and composite decking  products to customers in Coleraine and across Northern Ireland.

Make the most of your garden and outdoors

Since its establishment in 1939, A. Diamond & Son has built a reputation as one of Northern Ireland’s leading sawmills and timber suppliers by producing top-quality timber products and providing excellent customer service. From fence panels and roof shingles to decking and climbing frames, we can manufacture any timber structure you want. We supply our products to homeowners, business owners and timber tradesmen.

We are also a main Northern Ireland supplier of composite decking and cladding, fence panels and DuraPost systems.

if you are planning a decking project, get in touch with our team.  They will be able to help you design an plan your project.  

For more information on our services or to place an order. We will be on hand to answer all your queries and provide professional advice.

Reversible Decking

Each rail has two types of decorative profiles.

  • 3.600m x 144mm x 32mm
  • 3.900m x 144mm x 32mm
  • 4.200m x 144mm x 32mm
  • 4.500m x 144mm x 32mm
  • 4.800m x 144mm x 32mm
  • 5.100m x 144mm x 32mm
  • 5.400m x 144mm x 32mm

Spindle Panel

A beautifully finished panel with planed timber and eased edges, assembled with rust proof fixings.

  • 1800mm x 900mm

Glenariff Panel

Attractive fence panels that look great around decking.

  • 1800mm x 900mm

Flat Decking

Smooth decking boards

  • 3.600m x 144mm x 32mm
  • 4.800m x 144mm x 32mm

Step Stringers

Two deck boards for each step.

  • 3 step stringer and 5 step stringer

Deck Posts

Attractive support for your balustrade or fence panel. Planed with rounded edges. Available in regular, corner deck posts or external corner deck posts.

  • 1.200m


Walther Strong Post Tape is engineered to protect timber fence and gate posts at their most vulnerable point: just above and just below ground level. This critical zone is where moisture retention, fungal attack, and rot are most likely to occur, significantly reducing the lifespan of posts if left unprotected.


Using a specialist non-butyl, polymer based adhesive, Post Tape forms a durable, waterproof seal that blocks moisture, oxygen, and UV exposure. The adhesive penetrates into the timber and cures over time, creating long lasting protection without cracking, peeling, or degrading.

Suitable for both treated and untreated timber, Post Tape works alongside all chemical and non-chemical wood treatments without compromising performance. It remains flexible, UV stable, and effective in harsh outdoor environments, making it ideal for long-term ground contact protection.


Designed for practical, on-site use, Post Tape tears cleanly by hand, requires no tools, and can be applied to damp timber or in cold conditions. During installation, it can be repositioned easily before forming a permanent bond, ensuring accurate placement every time.


By sealing posts at the primary points of decay, Walther Strong Post Tape significantly extends the service life of timber fencing and gate installations, reducing maintenance, replacement costs, and premature failure.


  • Shields posts, deck joists and frames from moisture, rot, and weathering
  • Forms a watertight, airtight, and weatherproof seal
  • Can be used with round, square & steel posts
  • 25 year bond guarantee
  • Self seals around fixings, closing potential moisture entry points

Description Title

Deck Tape

  • 50mm x 20m
  • 100mm x 20m
  • 50mm x 50m

Post Tape

  • 100mm x 20m
  • 150mm x 20m
  • 200m x 20m
  • Can also be bought by the metre

  • Protects hard to tape timber details against moisture, rot and weathering
  • Designed to complement pressure treatment with long lasting surface protection
  • Fills gaps that Deck Tape struggles to reach, boosting overall timber durability
  • Quick application with brush or roller, no specialist tools required
  • Rubberised waterproof coating, seals timber efficiently without multiple layers

Description Title

  • 1KG
  • 4KG


Marlon R Glaze Modular Polycarbonate roof system

Fully utilise your decking or pergola areas by installing Marlon R Glaze polycarbonate roofing panels.  The sleek, glass like panels fit directly to rafters with standard tools and minimal installation accessories.

Marlon R Glaze panels are manufactured from impact resistant polycarbonate which is hardwearing, durable and long-lasting with a UV protection layer meaning you are protected from the sun.


Available in 4m x 670mm  & 5m x 670mm lengths

Install Instructions

Glazing Sheet

"Very knowledgeable helpful staff and great products."
- Briege McAuley, Facebook

get in touch

Want to install a garden island on your property?
Get in touch with our timber craftsmen today!
Tel: 028 7034 3452
Telephone: 028 7034 3452

Address: 35 Newmills Rd, Coleraine, BT52 2JB
Areas we serve