Thatched roofs are a beautiful sight on old farmhouses! There's simply no other type of roof with such a texture. A thatched roof uses natural reeds and grass, which, when properly cut, dried, and installed, form a waterproof roof. Traditionally, locally available materials were used. If local farmers grew wheat, wheat reeds or straw were used. Think rye, barley, and oat straw.
If you're planning to buy a house with a thatched roof, you'll naturally want to know its condition and how long it can last. Replacing a thatched roof is expensive.
The lifespan of a thatched roof generally depends on the material used and how well it is maintained. It's estimated that a thatched roof should last between 15 and 40 years. Water reed is considered the longest-lasting, with a lifespan of around 25-40 years, and up to 60 years. Wheat reed is estimated to last between 25 and 35 years, while long straw needs to be reattached after 15-25 years.
As you can see, the lifespan varies considerably. This is due to the level of maintenance. The drier the roof, the longer it will last. But the lifespan also depends on factors such as slope, substructure, location, craftsmanship, and maintenance.
Thatched roofs require regular maintenance to prevent deterioration. The roof structure will deteriorate over time, but minor repairs and maintenance will help keep the roof in good condition until it's time to completely reroof.
It is highly recommended to carry out inspections, especially before and after the winter season. The ridge of a thatched roof is most vulnerable to inclement weather and requires more maintenance than the roof itself. Ridges are strong and durable, but should be replaced on average every 10-15 years.
Water reed is naturally waterproof. This is not a waterlogged plant, damp and swollen by water. In fact, the inside of a natural water reed is hollow. Water is kept out by the tight overlapping of cells on the outer layers of the plant. The most durable reed material is water reed (Phragmites Australis), which can last 60 years.
Ireland's Shannon River and its tributaries once produced an abundance of water reed. Turkey also appears to have very good quality water reed. Reed from Poland, Hungary, and selected reed fields in France is also frequently used for roofs. In the Netherlands, 35% of the reed is domestically sourced.
Would you like to have a thatched roof inspection carried out on a house you're considering purchasing? Our inspectors are happy to visit you for a structural inspection . Request one online now!
The cost of a building inspection (up to 250 m²) is only €489 including VAT. We'll conduct a comprehensive building inspection and you'll receive a building report. Do you have any questions? We're happy to help and can schedule an appointment with an expert inspector right away if you wish!
