When can a roof contain asbestos?
Asbestos was used in Danish fibre-cement sheets (corrugated "eternit" and eternit slates) until the late 1980s, when it was banned in building materials. Rule of thumb: if the roof was laid before the late 1980s and never replaced, assume it may contain asbestos until documented otherwise. The roof's age is typically in the BBR building register and in the condition report.
When is it dangerous — and when isn't it?
Asbestos is dangerous when fibres are released into the air and inhaled. As long as the sheets are whole, intact and untouched, the everyday risk is limited. Problems arise with wear, breakage — and above all with processing:
Pressure-washing an asbestos roof is prohibited in Denmark. It wears the surface and releases asbestos fibres into the air and the soil around the house. A "beautifully cleaned" eternit roof in a listing can therefore be a red flag in itself — always ask how the roof was cleaned.
What does it mean for the price?
- All work gets more expensive. Repairing, removing and disposing of asbestos sheets is subject to special workplace-safety and waste rules. The contractor bill grows even for minor jobs.
- "Needs painting" can mean "needs replacing". Old eternit sheets become porous; paint is often a temporary fix. A full roof replacement on a detached house typically runs to a six-figure amount in kroner, depending on the roof's size and structure.
- Insulation upgrades and solar panels get complicated. Any plan to alter the roof runs straight into the asbestos rules.
How to check at the viewing
- Look up the roof's age and material in BBR — and compare with when the house was built.
- Look for flaking, moss and porous edges on the sheets.
- Ask: "Is the roof original? Is there documentation of replacement or renovation?"
- Read the condition report — but remember it assesses visible condition, not asbestos content as such.
- In doubt: a material sample at an accredited lab costs a few hundred kroner.
From our test analysesIn a test analysis before launch we found a home advertised as "bright and newly renovated" — where the roof's real condition and age made an imminent replacement likely. That kind of thing is never in the listing's headline.