Douglas Decking Kit 4.0 x 4.0m | 75mm Framing

Premium Douglas Fir Garden Decking Kits – 4.0m Width

Elevate your outdoor space with our professional-grade Douglas Fir decking kits. Chosen for its superior strength and natural beauty, this 4.0m width range offers a high-end alternative to standard softwood. We have meticulously calculated every component—from the dense fir boards to the stainless steel fixings—to ensure a seamless, long-lasting installation.

The Douglas Fir Advantage: Decking or Cabin Base

Renowned for its excellent strength-to-weight ratio and natural resistance to decay, Douglas Fir is the ideal choice for a premium garden deck or a heavy-duty timber frame base for a Log Cabin. These boards feature a versatile dual-surface design: one side is relief-cut (grooved) for a classic, slip-resistant finish, while the other is planed smooth to showcase the species' famous straight grain and warm tones.

Please note: These kits are designed to be cut to size during installation. This specific range is for 4.0m width configurations.

Technical Specifications

Decking Board Information

• Dimensions: 4.0m length x 145mm width

• Thickness: 28mm

• Material: Premium European Douglas Fir

• Treatment: The decking boards arrive untreated; treatment is supplied with each kit

• Finish: Kiln-dried for maximum dimensional stability; dual-sided (Relief-cut/Smooth)

Framing Timber Information

• Sectional Size: 44mm x 75mm

• Material: High-Quality Structural Softwood

• Treatment: Arriving pre-treated in a Black finish, we supply a touch up tub for cut ends.

• Installation: Recommended centres of 400mm (Timber must be cut to size on-site)

Installation & Foundation

This kit is supplied for installation on a flat, level area directly onto weed matting. To protect the premium timber and ensure airflow, we recommend the following:

• For Raised Decks: Use our plastic adjustable post holders or timber posts.

• 75mm Frame Beams (Included): Ideal for installation on hard, flat surfaces (like concrete) or when using adjustable base pads.

• 150mm Frame Option: If you plan to install your deck on timber posts or concrete blocks, we suggest opting for our 150mm frame version.

Hardware & Fixings Included

To match the quality of the Douglas Fir, we provide high-spec hardware for a secure build:

• Decking Screws: 5mm x 50mm stainless steel universal screws with a wax coating for effortless, rapid installation and corrosion resistance.

• Framing Screws: Heavy-duty 8mm x 80mm screws with a yellow zinc finish and large heads to resist breakage.

• Joist Hangers: Supplied for all middle joists with 4mm x 40mm screws.

• Joist Tape: Provided to protect the top of all framing timber before the Douglas Fir boards are installed.

• Treatment: For both the framing timber and decking boards is supplied.

The size of this decking kit:

• Max Width of 4.0m

• Max Length of 4.0m

• Height of 103mm

Other sizes available in this range:

• DDB-4.0x2.5m-75 - 4.0 x 2.5m

• DDB-4.0x3.0m-75 - 4.0 x 3.0m

• DDB-4.0x4.0m-75 - 4.0 x 4.0m

This decking kit includes:

• 15 x 45x75x4000mm Treated Framing Timbers

• 2 x Box of ø8x80mm Framing Screws

• 1 x Box of ø5x90mm SS Screws for Noggins

• 6 x Rolls of Bitumen Joist Tape

• 20 x Joist Hangers

• 1 x Box of ø4x40mm Screws for Hangers

• 28 x 28x140x4000mm Double Sided Douglas Fir Decking Boards

• 4 x Boxes of ø5x50mm SS Decking Screws

• 1 x Tub of Touch up Treatment for Framing Timbers

• 3 x Tubs of Douglas Fir Decking Board Treatment

Please Note: Sometimes the framing beam sizes will vary depending on availability, but you will always be supplied enough to complete the deck.