Services we provide

The Doff System

Stone Cleaning

The DOFF system is a steam based stone cleaning system. It is not like any other steam system and it is able to reach temperatures of 150c at the nozzle end. The operator of the system is able to vary the temperature and pressure to remove either many types of paint or biological matter. All operatives are fully trained & accredited in the use of the Doff System.

What is DOFF used for? The steam/superheated water will remove moss, algae, fungi and other biological matter and will also kill off spores. This means there’s then no need to use a chemical biocide during the removal process or as a protection against further biological activity.

How is it used? DOFF cleans stonework and masonry using high temperature steam. When the temperature in the system is high the pressure on the surface being cleaned is very gentle and the volume of water is low. The surface is therefore not saturated and will be dry within minutes.

Cathedral School Derry
Cathedral School Derry


  • High tempature steam cleaning Doff System.
  • Operatives are fully trained & accredited.
  • No need to use a chemical biocide.
  • Pressure on the surface being cleaned is very gentle.



At Clarke Restoration, we provide a complete range of Stonemasonry services which include

  • Stone Carving
  • Stone Replacement
  • Stone Repair
  • Stone Building
  • New Build

Brickwork Pointing and Stonework Pointing

There are numerous reasons for the building owner to commission the restoration of an existing building over the past two centuries.  The construction materials used tended to be of stone and brick.  All of which benefit from longevity.  Today there is a substantial percentage of aging buildings suffering from deterioration in the pointing element of the construction and will eventually lead to the poor performance of the building as a whole.

Repointing will aid with conservation, image and property value.



Clarke Restoration are highly aware of the potential damage that can be caused to historic buildings with the use of incorrect techniques.  The very nature of cleaning buildings correctly is vital in maintaining our heritage and a doorway to the past.

At Clarke Restoration we use a wide range of techniques.

  • Low Pressure Air Abrasive System
  • Chemical Cleaning
  • Graffiti Cleaning & Removal
  • Steam Cleaning



Restoration and Repair

Includes a wide range of services from stone cleaning and restoration to the final finishing and decorating.

Tuck Pointing and Lime Pointing

Tuck Pointing & Lime Pointing using traditional materials and methods.

Historic and Listed Buildings

From a heritage perspective it is widely acknowledged these buildings should be cherished.  Like us, buildings will age and their life can only be prolonged with proper care, treatment and maintenance, our services to these include lime pointing, stone masonry repairs, cleaning and rendering.

Lime Pointing

Pressure Grouting

Pressure Grouting

Pressure grouting is the name given for the injection of a liquid grout into voids under pressure. This product sets in the form of a solid or gel to fill the voids

It can be used on 

  • Infilling redundant service pipes and ducts
  • Filling voids under machines bases
  • Stabilising loose fill material
  • Strengthening cavity or rubble stone walling
  • Make good washout ( masonry bridges, dams, culverts etc )

Pressure Grouting
Pressure Grouting

Pressure Pointing

Pressure Pointing

Pressure can be carried it using hand held pointing guns or by a machine pumping the mortar through a hose with a hand control valve . It is ideal for the replacement of water eroded or defective joints which have being raked out and ready for the application.

Pressure pointing enables the new joints to be installed quickly and consistently with good compaction and ensuring a complete fill of the void.

The mortars are normally pre – bagged so a consistent colour can be guaranteed and can be applied in overhead situations such as vaulted arches, culverts tunnels etc special lime blends can be used for heritage or listed buildings.

Pressure Pointing
Pressure Pointing