San Francesco di Paola Church MILANO – start work
BOTTOM FLOOR and PLASTER moldings decorative concrete
The pilasters, cornices and the bottom floor had large surface storage, over-painting deficiencies, chromatic alteration zones (especially where there were no reinstatements of surfaces);. Some areas were off from the wall bracket. Some areas were particularly degraded due to infiltration of rainwater. Here the pathologies encountered consisted of salt efflorescence, chromatic alteration and detachment of the pictorial layer and the layer of plaster. The performed cycle was as follows: timely Reconnaissance of all substrates for the detection, by beating by hand, of detachment from the wall support; consolidation in depth by means of injections; removing existing light plaster and painting using brush an appropriate solvent; thorough cleaning of the surfaces with the use of water; careful removal of fillings and restorations; perform timely integration of the surface reclaimed with specially formulated mortar similar to existing for composition, grain size and colour and laying of special plaster base support network; pictorial surface pitch of new fillings; writing to Tinteggio brush to sails made of silicates.
STONE and decorative concrete
Superficial deposits were present, weathering phenomena, black crusts in some portions of the undercut of the frames. The plinth also presented with chromatic alteration due to oxidation of the material and the bounce and leaking rainwater or, for the Interior due to humidity of capillary rise and resultant efflorescence and crystallization of salts.
Superficial deposits were present, erosion and disintegration especially particularly exposed portions, fractures, faults and black crusts in some portions of the undercut.
The performed operation for restoration of stone were the followings: clean surfaces with detergent; thorough cleaning of the surfaces with the use of water; removal of fillings removed and their replacement with lime mortar, sand and marble powder; including the sealing of these fractures, consolidating application, color balancing, application of water-repellent finishing cleaning with microaeroabrasione.
Iron and bronze-elements were the following pathologies: superficial deposits, oxidation, lacks finish and repainting with synthetic enamels black, lack of small parts. Recovery operations were focused in cleaning surfaces with detergent, passivated with fertan and protective surface treatment with incral and application of microcrystalline wax.
Elimination of organic presence and tenacious deposit of biocidal product packs and surfactant on the surface of stone and plaster, after mechanical removal using spatulas and stiff bristle brushes, if not sufficiently removed from previous treatment by brushing; removal of molds, mosses and lichens occurred by applying an aqueous solution of benzaclonio to 1-2%; the treatment was repeated, for the complete elimination of pests; It was necessary to verify its effectiveness after a period of at least 15-20 days. and in any case before the next consolidation and protection measures;. The intervention was completed by the final rinse with deionized water through pump sprayer and sponges.
Cleaning treatment for the removal of dull colours and concretions on the stone material
Cleaning treatment for removing surface deposits consistent, thick concretions and any black crusts, using air Vortex with microabrasivo helical low-pressure water, type “Jos system”. Systems have been used with compressed air at low pressure (0.5-1 bar) and nozzles of different diameter (2-3 mm). The area concerned has been sprayed from an aerosol of deionized water mixed with fine selected aggregates. The pressures have not exceeded 1.5 bar nozzle.
Consolidation of the plaster layer the stick and mounting support layer was created through the application of ethyl silicate with a brush, I sell care to protect the surfaces are not subject to consolidation. In order to proceed with the application of silicate, pictorial cycle was applied a colorless silicate primer with a brush in order to prepare surfaces cleaned and plastered the next layer of paint.
Restoring the cohesion of localized portions of plaster in DT, was created by using syringes, injection of a natural hydraulic lime mortar free of soluble salts and aggregate order selected, with characteristics similar to those of the existing plaster with with acrylic resin according to the degree of hazard of the posting.
Re-instatement of shortcomings with natural hydraulic lime mortar free of soluble salts, with selected aggregate to get a dough similar to the existing mortars, as defined by the preliminary analysis, appropriately sampled prior to surgery; the portions were reinstated on the wire and continuity to the existing plaster.
Grouting stone tiles affected by phenomena of lack deep by applying natural hydraulic lime mortar with selected aggregate in order to resume the existing stone colours through the use of dust and sand colored marbles. Grouting operations are not intended in reconstructive surgery but what optics to heal can trigger points of damage, cracks and water infiltration and particulate air pollution.
Painting of surfaces by means of lime paint with a brush, using overlapping color drafts to sail, in order to achieve an aesthetic effect similar to the original, by calibrating the tones and alternating pictorial layers in order to recreate and patinas typical effects of ancient plasters.
Protective varnish made with siloxane based repellent product applied to spraying after the complete drying of the supports and in operational contexts free of dust and strong winds. The protective application affected stone surfaces.
Skills : Development