Wood burns, so a wooden house is dangerous in a fire? That idea is still widespread, but it is wrong. We set the six most common misconceptions about the fire safety of timber frame construction against the facts.
Few topics raise as many questions among people considering building in wood as fire safety. Understandably so: wood burns, as everyone knows from the campfire or the wood stove. But a timber frame house is not a pile of firewood. It is a tested building system in which wood, insulation and boarding together deliver predictable, controlled fire behaviour. Below we debunk the six most persistent misconceptions, each time with the facts, standards and figures to back it up.
Wood is combustible, but it burns slowly and, above all, predictably. As soon as a wooden beam or stud is exposed to fire, a char layer forms on the outside. That layer insulates the core, so the wood underneath stays cool and strong. The European design standard for timber structures (Eurocode 5) uses a charring rate of around 0.65 mm per minute for softwood. After half an hour of fully developed fire, roughly 2 cm of a stud has charred, while the rest simply keeps carrying the load. Engineers calculate with this and size the structure so that it holds for the required time.
Compare that with steel: it does not burn, but at 500 to 600 °C it loses most of its strength and can suddenly buckle. That is exactly why steel in buildings is often wrapped in fire-resistant cladding. The "non-combustible" material is not automatically the safest one.
The fire resistance of a wall is not determined by a single material but by the complete wall build-up. In a timber frame wall, the wooden frame is enclosed between insulation and boarding. Plasterboard contains crystal water that evaporates when heated, keeping the temperature on the far side low for a long time. Mineral wool is non-combustible (Euroclass A1) and protects the studs from the side.
Such a build-up is tested as a whole in an accredited laboratory and receives a classification such as REI 30 or REI 60: the wall remains load-bearing (R), flame-tight (E) and thermally insulating (I) for 30 or 60 minutes respectively. For comparison: the Belgian basic standards require, for low-rise buildings, a structure of R 60, internal walls of EI 30 and compartment walls of EI 60. Those are values that a correctly built timber frame wall achieves. Always ask your building partner for the classification report of the wall system used.
Belgian fire regulations are material-neutral: they prescribe performance (how long a wall must hold, how much a material may contribute to the fire), not which material you have to build with. Whether you build in wood, brick or concrete, the same requirements apply.
Good to know: the Royal Decree on basic standards does not apply to single-family homes. For your own home, the framework is set mainly by good practice, the regulations of your municipality or fire brigade zone and the mandatory smoke detectors. But even without a legal obligation, we build every timber frame home with tested, certified wall build-ups. For projects that do fall under the basic standards, such as apartments, schools or offices, we supply the necessary fire certificates.
A house fire rarely starts in the structure. According to the Belgian knowledge centre Oscare, short circuits, kitchen incidents and chimney fires are the main causes. The fire therefore starts in the contents or the installations, in a wooden house just as much or as little as in a brick one. The construction method has hardly any influence on that.
What does make the difference between an incident and a tragedy is how quickly you are warned and whether you can get out safely. In 2025, 55 people died in house fires in Belgium; almost half of them died in their sleep. Working smoke detectors on every floor, a clear escape route and a well-finished home are the real lifesavers, whatever the building material.
In Belgium, home insurance is calculated primarily on the rebuilding value of the home, its location and the cover you choose. A timber frame home built to current standards is treated by insurers as a fully fledged new build. In practice, our customers see no negative impact on their premium. In doubt? Ask your insurer for a quote and mention that it concerns a timber frame home with a certified wall build-up.
For facades, the regulations look at the reaction to fire of the material, expressed in Euroclasses from A1 (non-combustible) to F. Solid wood of sufficient thickness and density naturally achieves class D, the class that is sufficient for most low-rise buildings. Where a higher class is required, for example for taller buildings or specific uses, wood can be brought up to class B with a fire-retardant treatment. Carpentier offers that treatment, with the corresponding certificates, so that you can choose a wooden facade even in stricter situations.
Timber frame construction meets the same fire requirements as any other building method and comfortably achieves them with tested wall build-ups. Wood burns slowly and predictably, the boarding and insulation protect the structure, and most fires start in the contents anyway. If you want to live safely, you are better off investing in smoke detectors, a well-thought-out design and a building partner who has its systems tested than in fear of a material.
Sources: Eurocode 5 (NBN EN 1995-1-2), Royal Decree on basic fire safety standards, Buildwise (formerly BBRI), Oscare – annual house fire figures 2025, NBvT fire safety information sheet.
Our advisers will gladly explain how our wall build-ups have been tested and which certificates we can provide for your project.
