Composite Decking Aftercare
Practical guidance for cleaning and maintaining composite decking, managing stains and protecting the boards from avoidable damage.
Caring for Your Composite Decking
Composite decking is designed to require less ongoing maintenance than timber, but it still needs regular cleaning to remove dirt, leaves, staining and organic growth.
Composite products differ between manufacturers and ranges. Always follow the care instructions supplied for the exact boards installed in your garden.
The Essentials
Sweep Regularly
Remove leaves, soil and loose debris before they collect within the board grooves or drainage gaps.
Use a Soft Brush
Clean using warm soapy water and a soft non-metallic brush unless the board manufacturer specifies another method.
Clean Spills Promptly
Remove food, drink, grease and oil before they dry or become embedded within the board texture.
Keep Gaps Clear
Maintain the drainage and expansion spaces between boards and around the deck edges.
How to Clean Composite Decking
Routine brushing and washing will normally remove surface dirt without the risks associated with aggressive chemicals or abrasive equipment.
Clear the Deck
Move furniture, plant pots and loose items so the complete surface and board gaps can be inspected.
Sweep Thoroughly
Remove leaves, stones, soil and loose debris using a soft or medium-stiff non-metallic outdoor brush.
Rinse Loose Dirt
Lightly rinse the surface with clean water to remove remaining loose material before applying a cleaner.
Use Warm Soapy Water
Apply a mild soap solution or cleaner specifically approved by the composite-board manufacturer.
Brush the Board Texture
Gently agitate the surface with a soft brush, working methodically along each board and within its embossed pattern.
Rinse Completely
Rinse each board thoroughly so dirty water and detergent do not dry and leave a visible surface film.
Not All Composite Boards Are Maintained the Same Way
Composite decking can be capped, uncapped, solid, hollow or manufactured using different surface materials. A method approved for one product may damage another.
Before using a pressure washer, stain remover, algae treatment or other specialist cleaner, identify the exact decking range and check its current care instructions.
Damage caused by unsuitable chemicals, equipment or cleaning methods may not be covered by the product manufacturer’s warranty.
Preventing Marks and Surface Damage
- Use protective feet beneath garden furniture.
- Lift heavy objects instead of dragging them over the boards.
- Use a suitable protective mat beneath barbecues.
- Clean food, grease, oil and drink spills promptly.
- Raise plant pots slightly to encourage airflow and drainage.
- Move furniture and planters periodically where practical.
- Keep soil, mulch and gravel away from deck edges.
- Clear leaves from board gaps and surrounding drainage.
Keep Hot Equipment Away From the Boards
Barbecues, fire pits, patio heaters, cigarettes, fireworks and hot tools can melt, distort or permanently mark composite decking.
Position outdoor cooking and heating equipment on a suitable non-combustible surface and maintain the clearances required by the equipment and decking manufacturers.
Darker composite boards may also become hot in direct sunlight. Take additional care with children, pets and bare feet during warm weather.
Check Before Using Pressurised Equipment
Some composite manufacturers permit controlled pressure washing, while others restrict or prohibit it for particular product ranges.
Confirm It Is Permitted
Check the exact manufacturer and board range before using any pressurised cleaning equipment.
Use a Wide Fan Setting
Where permitted, use the manufacturer’s pressure limit, fan angle and minimum working distance.
Protect Joins and Edges
Never direct concentrated pressure into expansion gaps, secured edges, board ends or visible fixings.
Choosing the Correct Treatment
Blot spills instead of spreading them and test every treatment on a small, discreet area before cleaning the wider deck.
Mud & General Dirt
Allow heavy mud to dry, sweep away the loose material and clean the remaining residue with warm soapy water.
Food & Drinks
Blot excess liquid promptly, wash with warm soapy water and rinse the complete affected board thoroughly.
Oil & Barbecue Grease
Absorb fresh grease without rubbing. Use only a degreaser approved for the specific composite product.
Leaves & Organic Marks
Remove leaves before they break down. Treat remaining marks using a suitable manufacturer-approved cleaner.
Algae, Moss & Mildew
Use a treatment confirmed as safe for the installed boards, protect nearby planting and rinse thoroughly afterward.
Paint, Adhesive or Cement
Do not scrape or apply solvents without product-specific advice. Contact Team Bespoke before attempting removal.
Care for the Complete Deck
The spaces between composite boards allow drainage, ventilation and normal material movement. Keep these spaces clear of leaves, soil and other compacted debris.
Do not fill expansion gaps with sealant, grout, soil or decorative material. Avoid raising surrounding ground levels against the deck edges or substructure.
Inspect accessible boards, steps, handrails and visible fixings periodically. Stop using any area that feels unstable or presents an immediate trip or fall risk.
Colour and Dimensions Can Change Naturally
Composite boards respond to sunlight and temperature. Some products may undergo an initial period of colour settling or weathering after installation.
Boards also expand and contract as temperatures change. The visible gaps around board ends may therefore vary throughout the year.
Minor shade variation, surface pattern differences and seasonal changes in expansion gaps do not normally indicate an installation defect.
Do Not Sand, Paint or Seal Without Approval
Many composite boards have a manufactured protective surface that can be permanently changed by sanding, paint, stain or generic sealers.
Avoid Sanding
Sanding can alter the board texture, colour and protective surface and may invalidate the product warranty.
Avoid Generic Coatings
Paints, stains and sealers may not bond correctly and can create peeling, discolouration or uneven slip resistance.
Check First
Contact Team Bespoke or the board manufacturer before applying any permanent treatment or surface coating.
What to Avoid
Barbecues, fire pits or hot equipment directly on the boards.
Harsh chemicals or cleaners not approved by the manufacturer.
Mixing cleaning products or applying one over another.
Wire brushes, metal scrapers or abrasive sanding equipment.
Pressure washing unless the exact product guidance permits it.
Dragging heavy furniture or equipment across the deck.
Blocking board gaps, drainage routes or ventilation spaces.
Applying paint, stain or generic sealer without approval.
Seasonal Composite Decking Checklist
Spring
- Complete a thorough clean
- Clear board gaps and edges
- Treat organic growth
- Inspect steps and handrails
Summer
- Protect against barbecue heat
- Clean food and drink spills
- Move planters occasionally
- Take care on hot boards
Autumn
- Remove fallen leaves frequently
- Keep drainage gaps clear
- Clean algae before winter
- Clear surrounding outlets
Winter
- Use plastic tools for snow
- Only use approved de-icers
- Keep the surface free from debris
- Check after severe weather
Maintenance Issue or Installation Concern?
Dirt, staining, algae, surface weathering, minor shade variation and normal seasonal changes in expansion gaps are generally maintenance or material matters. Loose structural components, widespread board movement, lifting edges or instability should be reported for review.
Important: This guide provides general aftercare advice. Composite decking products have different cleaning and maintenance requirements. Always follow the instructions supplied by the board and cleaning-product manufacturers, test products discreetly and never mix chemical treatments. If you are unsure, contact Team Bespoke first.
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