Composite (WPC) vs Timber Decking
Heat, Upkeep, Fixing & Cost Compared

What WPC and composite decking are

ClickBina’s timber decking cost guide describes WPC as a mixture of wood fibre and recycled plastic that is termite-immune and needs no oiling or staining. The market sells two broad grades:

• Basic or uncapped WPC: the same wood-plastic mix all the way through. Cheaper, but the exposed wood fibre at the surface can fade, stain and hold mould in shade.
• Premium capped composite: a WPC core wrapped in a polymer shell. The guide calls it fully moisture-proof and cooler underfoot than basic WPC, and the best low-maintenance option around pools and ponds.

Boards also come hollow (lighter, cheaper, with a visible cavity at the cut end that needs an end cap or trim) or solid (heavier, stiffer, better for heavy use). Ask which you are being quoted.

WPC vs hardwood at a glance

The table follows the material comparison in ClickBina’s decking cost guide.

Heat: the main WPC complaint in Malaysia

The same guide is blunt: dark-coloured WPC boards in direct sun can reach surface temperatures of 55–65°C at midday. That is too hot for bare feet around a pool. Choose lighter colours for sun-exposed decks, shade part of the deck with a pergola or umbrella, and prefer capped boards, which the guide rates as cooler underfoot than basic WPC. A timber deck in the same spot also warms up, but less sharply.

Expansion gaps and fixings

Plastic-rich boards grow and shrink with temperature. The decking guide says the substructure should allow 5–8 mm expansion gaps per 4 m run for thermal movement. Most composite systems use hidden clips that hold each board to the joists while letting it slide, and start and end clips at the edges. A deck laid tight, glued, or screwed without allowance will buckle or push against walls on the first hot week.

• Follow the board maker’s gap and joist-spacing rules.
• Use the system’s own clips and screws, not generic ones.
• Leave a gap at walls, posts and steps, covered by trims.
• Keep boards off the ground so air can move under them.

The substructure underneath

Whatever the boards, the frame decides how long the deck lasts. The decking guide notes that the substructure typically adds RM10–RM30 per sq ft, and that aluminium or steel frames cost more but are termite-immune and recommended for WPC or composite over poorly drained or termite-active ground. A termite-proof board on a timber frame that termites can eat is only half a solution.

On a concrete slab, balcony or rooftop, boards usually sit on a low frame or adjustable pedestals so water can drain beneath. On a waterproofed slab, the frame must not puncture the membrane.

Slip, mould and cleaning

A deck by a pool or in a shaded garden stays damp. Textured and capped boards grip better when wet; smooth or worn surfaces can be slippery, especially with algae. Clean the deck once or twice a year with a soft brush and a mild cleaner, clear leaves from the gaps so water drains, and keep planters on feet so the boards underneath can dry. Uncapped WPC in deep shade is the grade most likely to show mould spots.

Which material suits where

On a condo balcony, check the management’s rules before buying anything. Many buildings restrict what can be fixed to the balcony floor, and the balcony slab usually carries a waterproofing membrane that must not be drilled. Interlocking composite tiles or boards on adjustable pedestals can sit on the existing tiles, keep the drainage falls working and come up again when the balcony needs attention. On a landed home, the bigger questions are the ground underneath, the drainage around the deck, and whether the deck will sit against a house wall, where a gap for air and inspection keeps damp and termites away from the building.

Samples help more than brochures. Ask for real board offcuts, leave them outside in the sun for a few days, stand on them barefoot at midday, pour water on them and walk across in slippers. That simple test tells you more about heat, grip and colour than any catalogue page.

Lifetime upkeep: the real price difference

At installation, WPC and mid-range hardwood cost roughly the same per sq ft. The difference comes later: the decking guide says Chengal and Balau need re-oiling every 1–2 years to keep their colour, while WPC and composite need an annual clean only. If you are happy to let hardwood turn silver-grey, the oiling can be skipped; if you want it brown, budget for the oiling cycle.

Termites and the ground below

WPC boards are termite-immune, but termites in the soil still look for timber in the frame, the house walls and anything stored under the deck. Keep the ground under a deck clear, well drained and ventilated, and if the house has had termites, deal with them first; our termite control guide covers treatment options.

What decking costs

These are the installed figures (supply and install) in ClickBina’s timber decking cost guide, indicative Klang Valley.

Height off the ground, the frame material, steps, edges, lighting and access are what move a decking quote. A site visit is RM150, waived if you go ahead.

How ClickBina can help

Decking is not one of ClickBina’s own listed trades, so WhatsApp us your job details for a quote: the area, what is underneath (soil, slab or balcony), sun or shade, and the look you want. We reply within the hour. When a deck is part of a garden, pool or outdoor makeover, ClickBina handles whole-house refurbishment and coordinates the trades on one job, with a flat price and no hidden charges. For other garden surfaces, see our garden path guide and artificial turf guide.

Sources & methodology

• ClickBina timber decking cost guide — material definitions, the WPC vs hardwood comparison, surface heat, expansion gaps, substructure and installed prices.
• ClickBina termite control guide — treating termites before building over the ground.

Pricing note: prices are indicative Klang Valley figures quoted from ClickBina’s timber decking cost guide; a deck is priced in writing after the site has been checked.