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A bioethanol fire pit with a contained flame on a composite timber deck in a tidy Australian suburban backyard at dusk

Will a Fire Pit Damage a Composite Deck?

A bioethanol fire pit with a contained flame on a composite timber deck in a tidy Australian suburban backyard at dusk

Short answer: a fire pit can damage a composite deck, but the risk comes from the type of fire, not the deck. Wood and charcoal pits throw embers and drop hot coals and ash that scorch and melt composite boards. A flueless bioethanol fire pit is different: the burner is fully contained, with no embers, sparks or ash. EcoSmart Fire, the maker we stock, rates its ethanol fire pits as safe on sealed timber and most composite decking.

Can you put a fire pit on a composite deck?

Yes, if you choose the right fuel. Composite decking such as Trex, Ekodeck and Modwood is a timber-and-plastic composite: it handles warmth, but not direct flame, flying embers or sustained high heat at a single point. That rules out setting a wood or charcoal fire pit straight onto the boards. EcoSmart Fire states it plainly, that its ethanol fire pits are safe on a wooden deck, "including sealed timber decking and most composite deck boards". The reason is in the design: the articulating feet hold a 12.5 mm air gap under the base, so heat never transfers directly to the deck, and the contained burner produces no exposed coals, sparks or flying ash.

What actually damages a composite deck?

  • Flying embers and sparks from burning wood, the most common cause of melt marks and pin burns.
  • Dropped coals and hot ash when a wood or charcoal pit is knocked or emptied.
  • Concentrated heat where a hot base sits flat on the boards with no airflow.

A contained bioethanol fire produces none of these; an open wood or charcoal fire produces all three.

How do you protect a composite deck from a fire pit?

  • Choose an ember-free fire: a contained bioethanol pit rather than open wood or charcoal.
  • Set it on a flat, stable, hard surface. Sealed timber decking, composite boards, paving, concrete, tile and stone all work. Grass, artificial turf, carpet, loose rock and uneven boards where the feet cannot seat flat do not.
  • With EcoSmart's design, no deck protection mat is required, the 12.5 mm articulating-foot air gap does the work. Still clear leaf litter from under the unit and skip any warped board that makes it rock.
  • Keep the piece level, and follow the published clearances below.
  • Never burn wood, charcoal or treated timber on a composite deck.

The clearances that matter

EcoSmart Fire's published guidance for its bioethanol fire pits and fire tables is a minimum of 600 mm side clearance to fixed structures and 2,000 mm overhead clearance to anything moveable, and at least 1 m clear of flammable items such as throws and cushions while the unit is running. Every fire pit and fire table model complies with the ACCC mandatory safety standard for decorative alcohol-fuelled devices in Australia (with UL 1370 listing in North America and EN 16647 certification in the UK and Europe).

What should you not use on composite decking?

Avoid any open wood-burning or charcoal fire pit placed directly on the boards, anything that throws sparks, and any hot-based unit with no airflow beneath it. Composite is durable, but it will mark permanently under embers or a fixed hot spot.

Which fuels are safe on a composite deck?

Bioethanol and gas are the composite-friendly fuels, because neither throws embers nor drops hot ash onto the boards. Wood and charcoal are the fuels that scorch and melt composite, so neither should sit directly on a composite deck. The table sums up the four common fire pit fuels and where each belongs.

Fuel Embers or sparks Ash or hot coals Safe on composite decking? What it needs on the boards
Bioethanol (flueless) None None Yes A flat, level base with the clearances kept. No mat needed with EcoSmart's air-gap feet.
Gas (LPG or natural gas) None None Yes, with care Good ventilation, a stable base and safe bottle or line placement. Some models need a heat shield underneath.
Wood Yes, flying embers Yes, ash and coals No, not directly A non-combustible pad and wide clearance. Better on earth, gravel or paving.
Charcoal Yes, sparks Yes, hot ash No, not directly A non-combustible pad. Best kept off composite entirely.

The low-risk choice: a bioethanol fire pit or fire table

A bioethanol fire is the deck-friendly option: no embers, no ash, no smoke, and a real flame you can put out in seconds. The concrete-bodied EcoSmart fire pits and fire tables we stock are cast in Fluid concrete with a Grade 304 stainless burner, built for finished surfaces, and light enough to reposition. Compact pieces such as the Pod 30 and Mix 600 suit smaller decks and balconies, and the fire tables double as a low outdoor table.

Always check the specific model's placement guidance and rating, and if you are unsure about your deck, talk it through with us before you buy. For timber decks and the broader question, see our guide to putting a fire pit on a deck.

Frequently asked questions

Can I put a fire pit on a composite deck?

Yes, if it is a contained, ember-free fire. EcoSmart Fire rates its ethanol fire pits as safe on sealed timber and most composite decking, because the burner is fully contained and articulating feet hold a 12.5 mm air gap that keeps heat off the boards. Wood and charcoal pits should not go directly on composite, because embers and hot ash scorch and melt it.

How do you protect a composite deck from a fire pit?

Choose a contained bioethanol fire pit. With EcoSmart's design no deck protection mat is required, as the articulating feet keep a 12.5 mm air gap under the base. Keep it on a flat, stable surface, clear leaf litter, follow the published clearances of 600 mm to fixed structures and 2,000 mm overhead, and never burn wood or charcoal directly on the deck.

What should you not use on composite decking?

Open wood-burning or charcoal fire pits placed directly on the boards, anything that throws sparks or embers, and any hot-based unit with no airflow or heat barrier beneath it.

What is the best fire pit for a composite deck?

A bioethanol fire pit or fire table. EcoSmart Fire rates its ethanol pits as safe on sealed timber and most composite decking, thanks to a fully contained burner and a 12.5 mm air gap under the base; they produce no embers, ash or smoke and can be put out in seconds.

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Hayden Pearson

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About the author:
“I have a real passion for helping transform outdoor spaces so people can relax, connect and entertain with confidence and pride. With My Acre, I love guiding homeowners to create beautiful and functional outdoor living areas."

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