Owners of period and listed buildings often face the same dilemma when masonry needs cleaning. Should you use traditional sandblasting, or the gentler DOFF steam cleaning system? Both methods are excellent in the right situation, but choosing the wrong one can damage delicate stonework or fall foul of conservation rules. This guide explains the difference so you can make an informed decision.

What is sandblasting?

Sandblasting, also known as blast cleaning or shot blasting, fires an abrasive media at a surface using compressed air. The media physically removes paint, grime, rust and old coatings. By adjusting the media and pressure, the process can be made aggressive enough for industrial steelwork or gentle enough for soft stone. Soda blasting and soft blasting are lower-pressure versions ideal for more delicate masonry. You can see the full range on our [masonry blast cleaning page](https://alberny.co.uk/services/masonry).

What is the DOFF system?

The DOFF system is different. Instead of abrasive media, it uses superheated steam at variable temperature and pressure to clean the surface. It effectively melts paint off the wall and lifts away dirt without firing anything abrasive at the masonry. Because it runs at around 150 degrees, it also kills moss, lichen and biological spores, so growth does not return quickly and no chemical biocides are needed.

The key differences

Abrasion

Sandblasting is abrasive. DOFF is not. For very soft or fragile masonry such as weathered limestone or intricate brick detailing, the non-abrasive DOFF system is often the safer choice. For harder surfaces and tougher coatings, sandblasting can be quicker and more effective.

Dust

Sandblasting creates dust, which needs containment and extraction, especially in built-up areas. DOFF is a dust-free process, which makes it ideal for high streets, town centres and occupied buildings where mess must be kept to a minimum.

Listed building approval

This is the big one for many owners. The DOFF system is a recognised and accepted method for cleaning listed buildings and is often recommended by conservation officers. It removes paint while leaving any historic lime paint underneath intact, which is frequently a planning requirement. Low-pressure soda blasting is also commonly approved for Grade II listed work.

Speed

Sandblasting is generally faster on large areas with heavy coatings. DOFF is slower but more controlled, which is exactly what delicate heritage work calls for.

Which should you choose?

As a rough guide:

– Choose sandblasting or soda blasting for general masonry, brickwork, flagstone floors and inglenook fireplaces where the surface can take it.
– Choose DOFF for soft brick and limestone, intricate detailing, removing modern paint from listed buildings, and any job where dust must be avoided.

The honest answer is that the best method depends on your exact building, its condition and any planning conditions. That is why we always carry out a free site visit and will clean a small sample area if needed before committing to a method.

Heritage work is our speciality

We have cleaned Grade II listed cottages, historic stone buildings, breweries and heritage centres across the South West using both sandblasting and the DOFF system. We work alongside architects, local authorities and conservation officers to make sure the right approach is used every time. You can learn more about our steam cleaning approach on our [DOFF cleaning system page](https://alberny.co.uk/services/doff).

If you own a period or listed property and need advice on the safest way to clean the masonry, [contact our team](https://alberny.co.uk/contact-us) for a free site visit and quotation. We will recommend the method that protects your building and gives the best result.