How hot does Trex decking get in the summer sun in Moncton NB?

Dark-coloured Trex decking can reach surface temperatures above 50 degrees Celsius in direct Moncton summer sun, which is hot enough to be uncomfortable for bare feet and something every homeowner should factor into their colour selection. Moncton's summer temperatures regularly hit 30-33 degrees Celsius in July and August, and when direct sunlight beats down on a south-facing or west-facing deck for several hours, the surface temperature of the decking boards can climb 20 or more degrees above the ambient air temperature.

This heat buildup is a characteristic of all composite decking, not just Trex. Composite boards are made from a mix of wood fibres and plastic polymers, and plastic absorbs and retains heat more readily than natural wood. A pressure-treated wood deck in the same Moncton sun will also get warm, but composite surfaces consistently measure 5-10 degrees hotter than wood under identical conditions. This is the most frequently cited drawback of composite decking and one that deserves honest discussion.

Colour choice is the single biggest factor you can control. Dark colours like Lava Rock or Vintage Lantern absorb significantly more solar radiation than lighter shades. The earth tones that are popular across New Brunswick, such as Gravel Path, Toasted Sand, and Island Mist, are lighter options that stay measurably cooler. The difference between a dark brown Trex board and a light tan Trex board in the same sun exposure can be 8-12 degrees Celsius, which is the difference between uncomfortable and tolerable for bare feet.

Deck orientation matters considerably in Moncton. A south-facing deck receives the most sustained direct sun throughout the day and will reach peak temperatures in the early to mid-afternoon. A west-facing deck gets hammered by intense late-afternoon sun during the hottest part of the day. North-facing and east-facing decks naturally stay cooler because they receive less direct exposure during peak heat hours. If you are designing a new deck and heat is a concern, orienting the primary seating area to receive afternoon shade from the house or mature trees makes a noticeable difference.

Partial shade solutions are worth considering for Moncton decks that get full sun. A pergola over the main seating area, a shade sail, or strategic planting of fast-growing trees on the south or west side of the deck can reduce surface temperatures substantially. Even dappled shade from a single large tree can drop composite surface temperatures by 10-15 degrees.

It is worth noting that the heat issue is seasonal and situational. Moncton's truly hot, sunny days are concentrated in a roughly eight-week window from late June through mid-August. For the other ten months of the year, including the long New Brunswick winter when you might actually appreciate a surface that absorbs heat, the thermal properties of composite are either neutral or mildly beneficial. On a cool September afternoon, a composite deck in the sun is pleasantly warm underfoot.

The heat does not damage the decking material itself. Trex Transcend and Trex Enhance are both engineered to handle temperature extremes, and the capped surface prevents thermal degradation. The heat is purely a comfort issue for people and pets using the deck barefoot during peak summer conditions. Keeping a pair of deck shoes or sandals near the door handles the problem for most Moncton homeowners, and a quick spray with the garden hose drops surface temperature almost instantly when you want to use the deck barefoot.

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