Fitting your NeoTimber® composite products supplied by Grainex® is straightforward with the right preparation. Below are the official installation & care guides for our three main product groups — composite decking, composite fencing and composite cladding — as free PDF downloads, with the essential steps summarised beneath each one.
Every guide covers safe handling, recommended tools, pre-installation planning and long-term care. Still choosing a colour? Order free samples first, and use our free calculator to work out how much material you need.
Composite Decking
Covers subframe options (composite joists, adjustable pedestals, plastic joists & posts), the FastClip fixing system, board & trim fitting, picture framing, decking steps and full care guidance.
Download the Decking Installation & Care Guide (PDF)
Quick-start: composite decking
- Let boards acclimatise outdoors for at least 24 hours before fitting.
- Build a level subframe (composite, timber, plastic or metal joists) with a minimum 35mm airflow gap beneath. Joist centres 250–350mm, running at right angles to the boards.
- Leave end-to-end expansion gaps: 6mm below 4°C, 3mm at 4–25°C, and 1mm at 26°C and above.
- Fix boards using the FastClip system, double-joisting at every butt join.
- Finish edges with skirting and corner trims, and allow 5–10% wastage (15% for diagonal patterns).
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Composite Fencing
Covers handling, post installation options (composite posts on hard or soft ground, plus concrete and timber post retro-fits), fence panel and screen installation, composite gates and aftercare.
Download the Fencing Installation & Care Guide (PDF)
Quick-start: composite fencing
- Plan your runs, heights and the number of posts; set a string line for a straight, level baseline.
- Install your posts first — composite posts (1.8m, cut down as needed) on hard or soft ground, or retro-fit to concrete or timber posts.
- Build each panel by sliding the fence boards into the post channels, checking every board is level.
- Add screen or trellis tops and composite gates where required.
- Maintain expansion gaps and finish with post caps.
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Composite Cladding
Covers handling, subframe design and layout, fixing cladding joists, horizontal and vertical laying patterns, edging around windows and doors, and care guidance.
Download the Cladding Installation & Care Guide (PDF)
Quick-start: composite cladding
- Acclimatise boards outdoors for at least 24 hours; store flat on battens.
- Fix a treated batten or joist subframe to the wall in the recommended layout, allowing ventilation behind the cladding.
- Install boards in your chosen pattern (horizontal or vertical) using the recommended clips and fixings, keeping expansion gaps.
- Finish neatly with edging trims around windows, doors and exposed board ends.
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Need a hand?
Our team is happy to help with planning or product selection. Get in touch, request free samples, or browse our inspiration blog for ideas and how-to guides.