Thatched Roof Maintenance: A Practical Guide for Homeowners

A thatched roof that is properly looked after will give you decades of service. One that is neglected can deteriorate quickly, and problems that cost a few hundred pounds to fix when caught early can turn into a re-thatch costing many thousands if left. This guide covers what to look for, what you can manage yourself, and when to call a professional.

What to Inspect and When

You do not need to get on the roof — in fact, please do not, as walking on thatch causes damage. Most inspections can be done from the ground with a pair of binoculars, or from upper-floor windows and skylights where they give a good angle.

Twice a year (spring and autumn are ideal):

• Walk around the property and look at the overall profile of the roof. It should be consistent — any areas that look compressed, sunken, or uneven compared to the rest indicate thatch that has settled more than it should
• Check the ridge. This is the most exposed part of the roof and the first to show wear. Look for the ridge sitting lower in the middle than at the ends, for the decorative liggers pulling away, or for the material looking thin or ragged
• Look for any areas where the thatch has slipped downward, particularly near the eaves or around dormers and chimneys
• Check for dark patches, which can indicate damp thatch or the early stages of moss or algae growth

After any significant storm:

• Check for loose or displaced material at the eaves and ridge
• Look for debris (branches, tiles from nearby buildings) that may have landed on the roof and disturbed the thatch

The Ridge: What to Expect

The ridge is replaced more frequently than the main body of the roof — typically every 10–15 years depending on the material and exposure. If your ridge is approaching this age, have a thatcher look at it. A failing ridge left too long will allow water into the main thatch beneath, which shortens its life considerably.

Signs the ridge needs attention:

• The ridge profile has flattened or dipped in the middle
• The decorative hazel liggers or sparrs are pulling away or have broken
• You can see bare patches where the material has thinned
• Moss has taken hold heavily across the ridge

A re-ridge is a relatively straightforward and cost-effective job compared to a full re-thatch — catching it at the right time makes a real difference.

Vegetation and Trees

Overhanging trees are one of the most common causes of premature thatch decay. They do two things: they block sunlight and airflow, which slows the drying of the roof after rain, and they drop debris — leaves, twigs, seed cases — that settles into the thatch and holds moisture.

If you have trees near the property, keep an eye on branches that are growing over the roof and consider having them cut back. This is worth doing proactively — the cost of trimming a tree every few years is trivial compared to what a thatcher costs if the roof deteriorates prematurely.

Moss and algae growth is often a symptom of a shaded, poorly drained roof rather than a problem in itself. Treating the moss without addressing the shade that is causing it is a short-term fix.

Birds and Pests

Sparrows and starlings in particular will pull at thatch to find nesting material, especially in spring. House sparrows can do significant damage quickly if a colony takes to a roof. If you notice increased bird activity around the roof or can see material being pulled away, speak to a thatcher about installing netting.

Netting should be fitted properly — badly fitted netting can trap birds and cause its own problems. A thatcher will fit galvanised or stainless steel netting secured with spars so that it sits tight against the surface of the thatch without snagging.

Mice and rats occasionally burrow into thatch, particularly around the eaves. Signs include small holes at the base of the roof and material pushed outward. This is more common on older roofs with softer material. Again, netting is the main preventive measure.

What You Can Do Yourself

There is a limited amount a homeowner can safely do:

• Clear gutters and downpipes regularly. Blocked gutters cause water to back up and sit against the base of the thatch at the eaves — a common source of premature decay
• Remove debris from the roof surface using a very soft brush, carefully from a ladder at the eaves. Do not go onto the roof
• Keep records of any work done to the roof — dates, who carried it out, what was done. This is useful for insurance and for any future thatcher assessing the property

Do not attempt to patch or repair thatch yourself. It is a skilled trade, and an amateur repair can cause more damage than leaving the problem and calling a thatcher promptly.

When to Call a Thatcher

Call a thatcher if:

• You can see the roof is visibly thinning in any area, or thatch has slipped
• The ridge is showing the signs described above
• You have noticed an increase in bird activity or evidence of vermin
• There are damp patches on interior ceilings or in the roof space after heavy rain
• You are buying or selling the property and want an independent assessment of the roof’s condition
• The roof has not had a professional inspection in more than five years

Do not wait until problems are obvious from ground level — by that point, they are usually already expensive. A regular inspection by an experienced thatcher is inexpensive relative to the cost of the repairs it helps avoid.

How Often Does a Thatched Roof Need Major Work?

This varies considerably, but as a general guide:

These are averages. A well-maintained roof in a sunny, sheltered position can comfortably exceed them. A heavily shaded roof on a north-facing slope may need attention sooner.

The single biggest factor in how long a thatched roof lasts — after the quality of the original workmanship — is how consistently it is maintained and how quickly problems are addressed when they arise.

If you would like an independent assessment of your roof’s condition, Stuart offers thatching surveys and carries out all types of repairs and patch work and re-ridging across Wiltshire, Berkshire and Hampshire.