Quadriga

Stone Cleaning

Quadriga are specialists in Stone Cleaning.  Quadriga offer many systems of stone cleaning and repair to sympathetically conserve and restore all masonry and stone, preventing further deterioration, either structurally or aesthetically.

The different types of stone cleaning processes are designed to produce maximum results on the particular surface being cleaned, and which include most stonework, brickwork, granite, faience, terra-cotta, concrete rendering, marble and mosaic. The most used stone cleaning processes are:

Mason and Nebulous spray water processes

Controlled wet and dry grit blast processes

Low pressure wet abrasive process

Specialist process employing strong stone cleaning agent in conjunction with high pressure water cleaning

Following all stone cleaning and repair operations, we provide preservation treatment by application of a specialised clear silicone-based water repellent and preservative. External stonework often requires cleaning in order to adequately identify concealed defects. Once stone cleaning has taken place, our full diagnosis will determine the best method for repair depending upon the type of stone masonry and the extent of the decay.

Stone Restoration options are broadly the same as those used for other types of masonry and include complete renewal, insitu surface restoration, or consolidation.

Causes of stone masonry failure are most commonly; incompatible materials placed beside one another, inadequate weathering and poor quality repairs. The use of hand mortars in re-pointing is a common cause for stone deterioration.