Thatched roofs
Common causes of problems
Common causes of problems

Poorly maintained thatched roofs may suffer from problems including moss and vegetation growth, pest damage and natural deterioration.
The lifespan of thatch usually depends on a combination of factors. These include:
- the steepness of the roof
- the climate
- exposure of the roof to both sun and wind
Reed and straw may have a longer lifespan than heather or marram grass.
Many thatched roof types were developed deliberately depending on location.
Styles of dressing and fixing are dependent on the flexibility and texture of the material. Choosing the correct thatch has implications for the entire roof.
An imported style of thatch is not in keeping with the look or culture of an area and could also perform worse than the native style.
Moss and Vegetation
Moss on thatched roofs can be caused by damp conditions. A dry climate and exposure to sun and wind keep thatch dry and prevent the growth of moss.
Remove moss using a stiff brush. Installing horizontally-laid copper wire in several strands along the roof pitch can also prevent plant growth.
The best methods of managing vegetation growth are heating and ventilating the building and having a well-detailed roof.
As vegetation tends to grow in sheltered spots with less exposure to wind, pay particular attention to these areas.
Keep the roof free of overhanging tree branches to minimise vegetation growth.
Pest damage
Damage by birds its relatively easy to repair, but it should be dealt with as soon as possible.
Many thatches rely on netting to keep the thatch in place, and to block nesting or robbing by birds. Keeping the netting in good condition is key. Reed thatches are an exception to this and are not usually netted, being stiffer and less easily breached.
Rodent damage is more difficult to trace and repair. Damage by rodents can be more extensive, particularly in thatches with concealed fixings.
Repair work should be carried out by a competent thatcher using like-for-like materials and techniques.
- Previous
-
Maintenance and inspection
- Next
-
Fire damage