NJJ have carried out numerous Cleaning & Restoration projects and are skilled in the use of traditional materials such as natural stone, brick, terracotta and stucco. Whether a minor repair or an entire restoration project, our craftsmen are capable of the finest quality of finish.
Where required NJJ are able to provide detailed analysis of existing building materials and utilitise our international network of suppliers to source new material to match existing.
NJJ offer a full range of Restoration, Repair, cleaning and refurbishment services which include:
- Replacement and refurbishment works for natural stone, terracotta, stucco render, faience, brickwork, external paving and hard landscaping
- Leadwork, roofing, access, windows and decorations
- Structural repairs, modifications, and remodelling of facades, i.e., to make new entrances and retain frontage
- Façade dismantling and storage capabilities including the catalogue, crate service and stone salvage elements to ensure careful attention when reinstating
Here are some of the Cleaning methods NJJ Fully trained and fully qualified staff use to create amazing results...
Can be deployed on very detailed masonry or where more control and care is required in the cleaning method. ‘Active’ or ‘chemical’ poultices are designed for the removal of the various types of soiling and contaminants that are insoluble in water and for those which have penetrated deep into the surface. Alkaline poultices are generally used for cleaning or degreasing masonry surfaces and for paint removal.
Nebulous spray is a generic term for fine mists of clean water directed at the masonry from an optimum distance. The sprays can be used intermittently with the “dwell time” varying depending on site specifics. One of the advantages of nebulous water cleaning is its use of minimum amount of water for the minimum duration to soften the soiling.
There are numerous chemicals on the market containing varying formulations some are highly toxic. The effect on the masonry will depend essentially on the chemical similarity of the solvent and solute and on the duration of their contact but cleaning with chemicals is a highly skilled activity and as with all masonry cleaning should only be carried out by professionals.
Air and water aided abrasive cleaning – TORC/JOS Cleaning System
There are a number of air abrasive techniques currently available. These include a variety of machines, nozzles and abrasives from Vortech Vortex, Hodge Clemco, Neokleen, Liquabrade and JOS. This system is preferred by some conservation Architects and when used correctly by skilled operatives with the most appropriate medium it is highly successful.
Super-heated and steam cleaning systems – DOFF Cleaning System & ThermaTech
This hybrid of the pressure washer family produces excellent results on stone and brick masonry, using moderately high pressure water (upwards of 30bar) but at heated to a temperature of 150°C. The system can be used on concrete and stucco and is suited to the removal of flexible soiling such as organic deposits and traffic film. It can also be used to soften brittle carbon sulpha. The ThermaTech system combines continuous high temperature and pressure and lower water volume and delivered as a liquid spray at temperatures clost to 1550c referred to as “superheated water”. This system is designed specifically for site requirements and commercial use.