Creation and restoration of cornice outlines on the façade of a 19th-century dwelling
In the commune of Yseron, in the Monts du Lyonnais, a 17th-century inn, which had become a schoolmaster’s house in the 19th century, was entirely restored by the company Les Ateliers du Paysage, who specialise in restoration works in Forcalquier (05). Since the specification stipulated the use of original materials, two types of operations were used for the external façades: as-was repair of the existing decorative elements (frames, cornices, cornerstones and arches) using Prompt natural cement, as well as the creation of a framing décor identical to the original construction for an new large bay window. A perfect example of heritage conservation.
Cornice outlines (window frames, cornices, cornerstones and imitation bonding arches), initially done in Prompt natural cement, were damaged. On the one hand, they were cracked because of the movement of the façade walls and the lintels pugged to the ground, and on the other hand, had suffered various pick-offs and chips due to frost and the presence of iron.
New elements: creation of a frame décor identical to the existing bay window on a bigger bay. The different repairs and creations lead to different shades of colour than those already present, and colouring using ‘colature’ (a mix of filled lime) was performed. Vicat’s technician, Mr Petelaz, and their laboratory made a precious contribution to defining the consolidation, rebuilding, and cornice outline mortars for the diagnostic.
Procedure for creating the décor:
Modillion moulding in Prompt natural cement mortar and 0-2 sand in a mould made of plaster on the existing structure, and then sealed with Prompt natural cement and stainless steel rods. Insulation of pinch rods and preparation of a template for high mouldings. Mouldings formed using Prompt natural cement mortar and 0-2 sand for the core, and then finishing with a 1 cm Prompt natural cement mortar and 0-2 sand coat. Sponge finishing. Installation of pinch rods for low-level mouldings and then the same procedure. Curved connections between the two mouldings: hand application and finishing with a plaster chisel. Creation of a mould, then fixing to the wall for creation of pegs. Connection by hand and finishing using a plaster chisel. Cutting and installation of a formed sheet to link the depressed profile. Assembly by hand using Prompt natural cement and sand, and finishing with sponge. Straightening of depressed profile base. Creation of bay reveals with smoothed edges and incisions.
Blinding of cornerstones, the arch, the baluster parapet, the entrance and the balusters of the street-front balcony. Very fine sand “archifine 0.2” binding, compressor and Norblast binder. Repair to cracks: syringe injection of mortar comprised of Prompt natural cement and lean coat, up to overflow. Settling using a smoothing machine. Repair of spallings: application using stucco plaster smoothing tool with mortar comprising Prompt natural cement and a fine filler for the smallest, and fine sand for the bigger ones. Grade is studied for each case. Iron elements: removal of iron elements, replaced by new ones in stainless steel with a Prompt natural cement mortar and 0-2 sand. Passivation using a ready-to-use product if the iron cannot be removed. Restoration to the decoration of the living room lintel on the southern wall. Cleaning by aspiration and blowing of all cracks and removal of loose materials. Injection and filling in one pass if possible for remodelling by hand with a smoothing tool or small template if possible. Repair to imitation bondings of the vaulted ceiling and the arc. Cleaning by aspiration and blowing. Application of Prompt natural cement mortar with 0-2 sand, then modelling with a round-nose trowel. Creation of decoration on the south face, dismantling and completion of a plaster mould, then moulding of badly-damaged balusters in PNC and 0-2 sand mortar. Repositioning and sealing using Prompt natural cement mortar. Repair to cracks and spallings, same procedure as before. Repair to render on the damaged plinths and creation of a new plinth. Preparation of a render, projection of a 2 cm coat using Prompt natural cement and 0-2 sand mortar. Floating and then smoothing. Colouring of frames, cornices and cornerstones for the application of a CL90 lime-based colature, marble powder, talc and addition of “natural” products (not from chemical synthesis). 2 passes, colour chosen by the client.
Entreprise LES ATELIERS DU PAYSAGE - 6 Place Vieille - 04300 FORCALQUIER
Tel.: 04.92.74.23.19 - http://ateliers.paysage.free.fr/
Location and date of worksite:
The commune d’Yseron, in the Monts du Lyonnais (69). During 2010.