From Realtà Mapei International n° 81 - 9/2/2020

Church of San Paolo Eremita

Effective and long-lasting products for the restoration and consolidation of a church badly damaged by the passage of time - the intervention ensured the conservative restoration and consolidation of the Church of San Paolo Eremita and the safeguard of its ancient walls.

Thanks to the MAPE-ANTIQUE line, it was possible to carry out the work without compromising the historical significance of the walls, while the MAPEWOOD line products, which are chemically and physically compatible with the original wood, were used to restore and repair the wooden roof trusses. Lastly, the entire structure was consolidated with the help of products from the Mapei Structural Strengthening line.

 

Location icon Brindisi

Sunday, 28th October 2018 marked the reopening of the fourteenth century Church of San Paolo Eremita (St. Paul the Hermit), one of the most important sites of the city of Brindisi’s cultural heritage.

Naples State Archive conserves the most ancient document making reference to the church: a solemn ordinance dating back to 2nd March 1284 whereby Charles I of Anjou, King of Naples, granted permission for Franciscan monks to build a monastery and church, which went on to be completed in 1322.

Work commenced in November, 2016 and it took two years to complete the conservative restoration and consolidation work on the interior and exterior of the church. The work also included an overhaul of the roof over the aisle, the replacement of the wooden trusses for the apse and the new pitched roof, a thorough cleaning of all the altars and consolidation of the stone features and elements of the altars.

 

WINNING TEAMWORK ON SITE

The complex work commenced with a preliminary study carried out by Luigi Dell’Atti, a local architect who also guided the team of restorers. Right from the start of the design work, the team was assisted by Mapei Technical Services, with specialists from various product lines also involved. When more significant problems regarding static consolidation arose, Prof. Alberto Balsamo from the Federico II University of Naples was also called upon to provide his assistance. This team-synergy approach also included the active participation of the main contractor Nicolì SpA, which enabled the product systems to be identified and perfectly modulated to overcome the problems that arose regarding the structural strengthening, dehumidification and protection of both the interior and exterior of the church.

 

STATIC CONSOLIDATION OF THE STONE STRUCTURE

MAPE-ANTIQUE F21 binder was used to consolidate the stone structure and limestone vaulted ceiling of the church. This is a cement-free, salt-resistant product made from lime and Eco-Pozzolan used to make super-fluid, volumetrically stable slurries and was injected in the structure by using low-pression pumps.

For the installation layers and for pointing on the “natural finish” masonry of the church, on the other hand, the product chosen was MAPE-ANTIQUE ALLETTAMENTO salt-resistant masonry mortar, made from natural hydraulic lime and Eco-Pozzolan and available in 7 colours.

 

CONSOLIDATION OF THE SURFACE OF THE MASONRY

The surface of the masonry was consolidated in several steps. The first step was to pre-consolidate the surfaces with PRIMER 3296, an acrylic primer in water dispersion.

The larger cracks in the surface were then stitched with CARBOTUBE C 170/10 (pultruded carbon fibre tubes impregnated with epoxy resin) in combination with INJECTORS Ø23+MAPE-ANTIQUE F21.

 

CONSOLIDATION OF THE VAULTED CEILINGS

The vaulted ceilings were consolidated by capping them with MAPE-ANTIQUE STRUTTURALE NHL, a pre-blended, cement-free mortar for transpirant render and masonry work, based on natural hydraulic lime, Eco-Pozzolan, recycled materials, natural sands, micro-fibres, glass fibres and special admixtures. The use of this product, in combination with MAPENET EM 40 pre-impregnated, alkali-resistant glass fibre mesh (FRP) and MAPENET EM CONNECTOR 7 mm diameter and 200 mm long fibreglass connectors, formed a reinforced layer suitable to consolidate the extrados of sandstone vaulted ceilings.

The joints were reinforced with 6 mm diameter MAPEI STEEL BAR 316, ultra high-strength, AISI 304 and AISI 316 stainless steel helical bars, used in combination with MAPE-ANTIQUE ALLETTAMENTO.

 

CONSOLIDATION AND RESTORATION OF THE WOODEN TRUSSES

The wooden trusses were consolidated and restored using products from the MAPEWOOD SYSTEM. This line of products is made from special epoxy adhesives chemically and physically compatible with wood.

The surface of the wood was initially treated with MAPEWOOD PRIMER 100 – a fluid epoxy primer in water dispersion – and then with MAPEWOOD PASTE 140, a thixotropic epoxy adhesive for repairing wooden  beams, trusses and columns.

 

THE DEHUMIDIFYING SYSTEM

The macro-porous dehumidifying system for the interior masonry of the church consisted of a scratch-coat layer of MAPE-ANTIQUE RINZAFFO cement-free, salt-resistant, transpirant mortar made from lime, Eco-Pozzolan and recycled materials.

This product was followed by a layer of MAPE-ANTIQUE MC, a special salt-resistant, macro-porous, dehumidifying rendering mortar made from lime and Eco-Pozzolan.

Once this layer had cured, the walls were skimmed with MAPE-ANTIQUE FC GROSSO, a salt-resistant, large-grained, transpirant skimming mortar made from lime and Eco-Pozzolan for a rough finish on renders.

 

STRENGTHENING THE MASONRY

The masonry was strengthened by applying reinforced render made from MAPEWALL RENDER & STRENGTHEN, a high strength, fibre-reinforced, natural hydraulic lime-based transpirant rendering and masonry mortar with very low emission level of VOC (Volatile Organic Compounds) for making structural render, even “reinforced” (CRM). The product was used in combination with MAPEGRID B250 primed alkali-resistant basalt fibre mesh which was fixed in place with L-shaped MAPENET EM CONNECTOR L20 glass fibre fasteners anchored with MAPEFIX PE WALL styrene-free chemical anchor.

 

PROTECTING THE STONE SURFACES

The stone surfaces of the church were treated to protect them from the action of heavy, driving rain with ANTIPLUVIOL W, a colourless, silane and siloxane-based water-repellent impregnator in watery emulsion which also improves the self-cleaning effect of the façade and reduces the capacity of moss and mildew from adhering to the material.

 

Project data sheet

Yard masonry walls and wooden trusses
Location Brindisi, Italy
Subcategory CHURCH
Application supply of products for masonry restoration and consolidation, repair of trusses
Start and finish date 2017/2018
Application Type Facades maintenance, Masonry restoration, Structural reinforcement
Client ARCIDIOCESI DI BRINDISI - OSTUNI
Contractor company NICOLI' SPA
Installer companies NICOLI' SPA
Architects ARCH. LUIGI DELL'ATTI, ING. CLAUDIO RIOTTA, ING. GIACOMO INTIGLIETTA
MAPEI Distributor NICOLI' SPA
Project Manager ARCH. LUIGI DELL'ATTI
MAPEI Coordination DISPOTO GIAMMARIO -CARCAGNI' LUCA- DE MATTEIS DANILO

Products mentioned in the article

ANTIPLUVIOL W
ANTIPLUVIOL W
Transparent, silane and siloxane water-repellent impregnator in watery solution. TECHNICAL DATA: Consistency: fluid liquid. Colour: milky.…
CARBOTUBE
CARBOTUBE
Pultruded carbon fibre tube preformed with epoxy resin with a protective plastic film for reinforced stitching in masonry. TECHNICAL DATA:…
MAPE-ANTIQUE ALLETTAMENTO
MAPE-ANTIQUE ALLETTAMENTO
Salt-resistant masonry mortar, made from natural hydraulic lime and ECO-POZZOLAN, cement-free, for installation layers and pointing on…
MAPE-ANTIQUE F21
MAPE-ANTIQUE F21
Super-fluid, salt-resistant, hydraulic binder with fillers made from lime and ECO-POZZOLAN applied by injection for consolidating masonry…
MAPE-ANTIQUE FC GROSSO
MAPE-ANTIQUE FC GROSSO
Salt-resistant, large-grained lime and ECO-POZZOLAN cement-free, breathable skimming mortar for a rough finish on render. TECHNICAL DATA:…
MAPE-ANTIQUE RINZAFFO
MAPE-ANTIQUE RINZAFFO
Salt-resistant, breathable, lime and ECO-POZZOLAN cement-free, scratch-coat mortar applied as a base layer for de-humidifying, breathable…
MAPE-ANTIQUE STRUTTURALE NHL
MAPE-ANTIQUE STRUTTURALE NHL
High-performance breathable mortar for render and masonry work made from natural hydraulic lime and ECO-POZZOLAN, cement-free, particularly…
MAPEFIX PE WALL
MAPEFIX PE WALL
Styrene-free chemical anchor made from polyester for light loads certified for masonry. TECHNICAL DATA: Suitable substrates: all full and…
MAPEGRID B250
MAPEGRID B250
Alkali-resistant, primed basalt-fibre mesh for structural “reinforced” strengthening of stone masonry, brick, tuff and concrete surfaces.…
MAPEI STEEL BAR 316
MAPEI STEEL BAR 316
Ultra high-strength helical bars in AISI 316 stainless steel for reinforced pointing on masonry structures. TECHNICAL DATA: Type of steel:…
MAPENET EM40
MAPENET EM40
Pre-impregnated alkali-resistant A.R. glass fibre mesh (FRP) used to make “reinforced” structural render on concrete and masonry…
MAPEWALL INTONACA & RINFORZA
MAPEWALL INTONACA & RINFORZA
Malta per intonaci e da muratura traspirante, ad elevate prestazioni meccaniche, a base di calce idraulica naturale, a bassissima emissione…
MAPEWOOD PASTE 140
MAPEWOOD PASTE 140
Thixotropic epoxy adhesive for restoring wooden structural elements. TECHNICAL DATA: Mixing ratio: comp. A : comp. B = 2 : 1. Workability…
MAPEWOOD PRIMER 100
MAPEWOOD PRIMER 100
Fluid epoxy impregnator in water dispersion for consolidating and priming wooden structures. TECHNICAL DATA: Mixing ratio: comp. A : comp.…
PRIMER 3296
PRIMER 3296
Acrylic primer in water dispersion with high penetration, consolidating and anti-dust properties for screeds. TECHNICAL DATA: Consistency:…

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