The Electoral Palace of Mainz is the former city residence of Mainz's archbishops and is one of the last remaining structures of the so-called "German Renaissance". The two-wing complex has an impressive, rich architectural structuring of the base areas, cornices, window reveals and pilasters made of Bunter sandstone and render areas.» More about The Electoral Palace of Mainz
Project Example Kurfürstliches Schloss Mainz
Since 2010 the palace has been thoroughly repaired in the façade area, as sanding, chalking of the old mineral coat and contour scaling had occurred. First, damaged or irreparable Bunter sandstone elements were repaired or replaced and then a new colour design was applied. The coating system had to be particularly weather-resistance, have long lives, be extremely water-vapour permeable and prevent the transport in water of aggressive salts or discolouring minerals. High requirements also had to be fulfilled with regard to the look of the coating: On the one hand, a matt surface with unmistakeable mineral character was to be produced, and only the mineral paint technique was to be used, which is applied as a very thin coat using a brush. The red-brown to light-brown historical colour of the façade was to be determined authentically by trying out the product on test areas and by a special colour recipe The new oak windows were to be designed with a glazing Linseed Oil system; this was chosen especially due to its good building physics properties and economic maintenance intervals.
The Project Stages
The decision to use a BEECK paint system was made early in the project by the City of Mainz, the built heritage conservation office and the commissioned firm of architects. First, based on the existing findings and expertises, sample areas were made on original substrates, in which different colour samples were formulated. Only after the precise technology, the exact colour recipe and the calculated consumption (application rate), did the public call for tenders take place for the painting and decorating work the execution of which was checked and documented precisely.
The Paint System Used
In order to fulfil all the restoration requirements, an active silicate system was chosen for the coloured façade design. The new oak windows were treated with a semi-transparent stand oil glaze system, in line with the overall appearance.
The new "special Schloss Mainz colour", reconstructed on the basis of old records, has a matt appearance in period style and lends the sandstone surface of the extraordinary façade a unique mineral profile. The colour design of the new oak windows with the BEECK Stand Oil system with an old character harmonises with it perfectly and fits seamlessly into the overall appearance of the historical building complex.
Bernd Willy Engel
Mobil +49 175 2 04 40 96
The Products Used
Silane PrimerPrimer The water-repellent, deep-penetrating primer is based on active organosilicon components and protects the surface zone from moisture penetration and capillary water transport as well as the associated activation of structurally harmful or discolouring, water-soluble constituents and salts.
Beeckosil FinePrimer, intermediate and topcoat The active silicate, water glass-based paint reacts with the mineral substrate by silicification only. Absolutely UV resistant inorganic mineral pigments (including where full colours are used) prevent colour changes and produce an authentic style, matt and fine surface look. Beeckosil can be coated over an unlimited number of times and is characterised by natural bronzing (chalking).
Oil PrimerPrimer of the oak windows The dissolved boiled concentration of resin and linseed oil made to a traditional recipe penetrates outstandingly well and pore-deep into the substrate where it is anchored by low-molecular linseed oil with "creep capability". Following oxidative through-drying a surface results that does not swell in water, which reduces absorbency, but retains the diffusion and sorption capability of the material.
Exterior Stand Oil Wood GlazeIntermediate and topcoat of the oak windows BEECK Stand Oil Wood Glaze is a classic, satin matt boiled down stand oil mixture, which cross-links to form an elastic, diffusible coating film through oxidative drying that does not swell in water. In combination with UV-resistant, finely ground mineral pigments, a surface is produced which does not tend to flake off and become brittle, even in the most intense weathering. The maintenance intervals are very economical due to the natural bronzing through chalking.
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