Roof Care for Exeter's Historic and Period Homes

Exeter wears its long history openly. A Roman city to begin with, it still shows its ancient walls, its medieval cathedral and streets, and centuries of building that followed, from Georgian terraces to Victorian villas and the rebuilding that came after the war. Above all that history sit roofs of many ages, and the older ones in particular need care that respects what they are.

This guide is for owners of Exeter's historic and period homes. It explains what makes an older roof different, why the local climate encourages moss, and how to keep a period roof clean and sound without causing damage to a building that carries real age and character.

The quick answer: Exeter's older homes usually have aged slate or clay roofs that are brittle with time, so they should be cleaned with gentle low pressure soft washing rather than a pressure washer, with the ridges, valleys, flashings and gutters checked at the same time.

1. A city of many ages

Few English cities span as many eras as Exeter. Founded by the Romans, shaped through the medieval period around its great cathedral, then expanded with Georgian and Victorian housing, the city offers a remarkable range of period property. Much of it is built with local materials, including the warm red sandstone seen in older walls and buildings.

The roofs on these homes have weathered a great deal of Devon weather. Even where slates or tiles have been replaced over the years, the underlying structure, timbers and chimneys often date to the original build, and the covering as a whole has aged considerably.

For a homeowner, that means looking after a period roof rather than a modern one. It was built to last, but it needs the respect its age deserves.

2. Why age makes a roof fragile

Older slate and clay behave differently from new materials. Slate can delaminate, flaking into thin layers, and the nails holding it corrode and fail, leading to slipped and missing slates. Clay grows brittle and can crack, especially after a frost. Both develop weathered, textured surfaces that moss and lichen colonise readily.

The details matter as much as the open slopes. Ridge tiles bedded in old mortar work loose, valleys between slopes collect debris, and lead flashing around chimneys lifts or splits with age. A single failed detail can let water into an old building even when the rest of the roof looks sound.

All of this means an older Exeter roof cannot be treated roughly. It needs a gentle approach that cleans without stressing brittle materials or dislodging the details.

3. Why moss takes hold in Exeter

Exeter sits in the mild, damp climate of Devon, on the River Exe, with rain spread across the year and few long dry spells to bake a roof clean. That steady moisture is exactly what moss, algae and lichen need to thrive.

Older roofs make an even better home for them. Weathered slate and clay give spores an easy grip, and the city's mature trees shade roofs and drop debris that holds moisture against the tiles. Shaded, north facing slopes green over first and worst.

On a period roof, that trapped moisture is a real threat. It keeps brittle materials constantly wet, works into joints, and washes debris down into the gutters where blockages lead to overflow and damp.

4. The right way to clean a period roof

For these roofs, soft washing is the correct method. Instead of force, it uses low pressure water and a biocide that kills moss, algae and lichen at the root. The growth dies off and clears gently, without the covering being battered.

Pressure washing can do real harm to a period roof. A powerful jet cracks aged slate and clay, washes out ridge mortar and drives water under the covering, turning a clean into a repair bill. Soft washing avoids all of that while cleaning thoroughly.

The biocide keeps working for months, slowing regrowth in Exeter's damp climate. That means fewer interventions over time, which is exactly what you want on a roof you are trying to preserve.

5. Looking after the whole roof

A period roof is a system, and its details and gutters matter as much as its slopes. On an older Exeter home, keeping water flowing where it should protects the walls and any stonework below. Here is what a proper clean and check should cover:

• The main slopes , cleared of moss and algae by gentle soft washing.
• Ridge tiles and mortar , checked for looseness or crumbling.
• Valleys between slopes , cleared of debris that causes blockages.
• Lead flashing around chimneys and abutments, checked for lifting or splitting.
• Gutters and downpipes , cleared to protect the walls below.

Catching a loose ridge or a lifted flashing early is far cheaper than dealing with the water damage that follows if it is missed.

6. Choosing the right care

A historic home deserves a careful hand. The right professional understands older buildings, uses the gentle soft washing method, and checks the vulnerable details as well as the open slopes. Safe access matters too, given the age and often awkward layout of Exeter's period property.

That care is an investment. A roof cleaned properly and checked regularly keeps both its looks and its strength for many years.

Frequently Asked Questions

Will cleaning damage the slates on my period home?
Not if done gently. Pressure washing can crack or dislodge aged slates, but a low pressure soft wash lifts moss and dirt safely and is the right method for older roofs.

Why do older Exeter roofs attract so much moss?
Their weathered slate and clay give spores an easy grip, and Exeter's mild, damp climate and shade keep the surfaces moist, which is what moss and algae need.

Do I need consent to clean a listed roof in Exeter?
Routine gentle cleaning usually does not, but work that could affect the fabric of a listed building may. If in doubt, check with the local conservation team first.

How often should a period roof be cleaned?
It varies with shade and tree cover, but every few years is typical. The lasting biocide protection means the roof is disturbed less often, which suits an older building.

Can I clean the roof myself?
It is best not to. Working at height on older property is risky, and the wrong method can damage fragile materials. A specialist is safer and more effective.

Own a period home in Exeter?
Ben's Roof Cleaning cares for historic and period roofs across Exeter and Devon, with a gentle soft washing method and over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

Caring for roofs with a long history

Exeter's historic and period homes carry roofs that have already weathered generations of Devon seasons, and with the right care they will weather many more. The key is to respect their age. Treat brittle slate and clay gently, clean with low pressure rather than force, and keep the details and gutters in good order so water always goes where it should. Do that, and an older Exeter roof will keep both its character and its strength for years to come.