Wartburg Castle - near the Thuringian town of Eisenach and surrounded by forest-covered hills - has a very special and unique position among German castles. It was founded ca. 1067 by Count Ludwig der Springer and has been part of the World Cultural Heritage since 1999.» More about Wartburg Castle
Project Example UNESCO World Heritage – Wartburg in Thuringia
In preparation of the 500 year anniversary of the German Reformation in 2017, the eyes of the world are particularly focussed on Wartburg Castle. Extensive building renovation work is underway including refurbishing, supplementing and redesigning the exterior paintwork. In line with the extensive existing material on site, the new paintwork not only fulfils building conservation standards in terms of the colours used but also the materials. Taking into account the situation found on site, the aim was to draw up a coherent colour and surface concept, appropriate for the building's cultural history significance.
- The effect and interaction of the coating systems used with different surfaces should result in an appearance that is in keeping with the original and have an authentic composition.
- Furthermore, their robustness and good building physics properties should combine high stability of value with economic efficiency.
The Project Stages
Before the painting work started on site, extensive restoration work was carried out on site to safeguard remaining old findings and based on these to compile a coherent and fine colour concept.
On the basis of this the lead restorer and the contractors created extensive test areas and sample coatings, which ultimately led to the decision regarding the application technology and colour to be used for the chosen paint systems.
The responsible firm of architects, the restorer and the responsible consultant of BEECK’schen Farbwerke provided advice and documented the implementation of the largely very sophisticated coating work.
The Paint System Used
Based on the objectives, all kinds of different paint systems were selected:
On the old mineral coatings of the exterior façades:
- Priming coat with BEECK FIXATIVE
The silicifiable potassium water glass facilitates uniform wettability of the substrate and a chemical reaction that firms and consolidates the mineral substrate.
- Intermediate and top coat with BEECK – BEECKOSIL, Coarse and Fine
This solvent-free 1 pack silicate system silicifies only with the mineral substrate and therefore forms a completely open, microporous unity with outstanding building physics properties. An extremely long life, especially on weathered façades, makes this paint system a very economical solution. By using mineral pigmentation only, the matt surface is absolutely UV resistant and the colour is stable, even in full colours.
On the old mineral coatings of the courtyard façades:
- Priming coat with BEECK FIXATIVE
(Description as above).
- Intermediate and top coat with BEECK CALCIDAN
The marble lime paint, soaked (slaked) for many years is reversible in the interests of building conservation and even following multiple renovations does not form any vapour-barring, thick covering layers. It produces a wipe-resistant and opaque lime wash coat with the best possible weather resistance. Due to their natural alkalinity these coatings have a bactericidal and mould resistant effect. They lend historical building materials an unmistakeably typical lime aesthetic look and feel.
On exterior half-timbered façades and exterior timber components:
- Priming coat with BEECK OIL PRIMER
This boiled concentration of dissolved resin – linseed oil made to a traditional recipe has an outstanding penetrability that reaches deep into the pores of the building material where it is anchored by "creepable" low molecular linseed oil. Following oxidative through-drying a surface results that does not swell in water, which reduces absorbency while retaining the diffusion and sorption capability of the material.
- Intermediate and top coat with BEECK Exterior STAND OIL WOOD GLAZE
This classic boiled down stand oil mixture, interlinked through oxidative drying to form a diffusible oil glaze film without water swelling. Pore deep penetration by "creepable", low molecular refined linseed oil ensures inseparable anchoring on high-grip woodwork. Even under intensive weathering, this paint system does not tend to become brittle but instead is removed from the surface by chalking.
The purely mineral pigmentation results in UV – resistant coatings.
The specifications and objectives of the very sophisticated new colour concept created in line with building conservation aspects were implemented to a high quality.
The work will be continued in 2014 on further subsections of Wartburg Castle.
The interaction of authentic mineral coating systems and their matt look with the reworking and supplementing of striking half-timbered design with classic old-style oil-based paints enables Wartburg Castle to appear in its true style once again.
Bernd Willy Engel
Mobil +49 175 2 04 40 96
The Products Used
CalcidanModified Soaked Marble Lime paint with high hiding power User-friendly, organically modified lime wash paint for lime-compatible, firm substrates. Universal, opaque and high yield use. For exterior application, such as on the façades of listed buildings, always test product on the original substrates first. Unlike silicate paints, premature bronzing due to the chalking typical for lime.
FixativePriming and binder for BEECK Silicate Paints including BEECK Pure Crystalline Finish Potassium water glass as binder, free from organic content to VOB/DIN 18363 2.4.1. Primer and thinner for BEECK Silicate Paints. Forms an inseparable microporous unit by means of silicification with the mineral substrate such as plaster, natural stone or concrete. As a strengthening primer for absorbent, chalking and crumbling substrates.
Beeckosil CoarseFine slurry base coat in the active silicate system to VOB/DIN 18363 2.4.1. Levelling, quartz-filled priming and intermediate coat in the Beeckosil system on substrates with minor structural defects or hairline cracks. Ready-to-use paste. Same colour topcoat with Beeckosil Fine. Use render to repair façades with cracks, chipped surface or structural defects and slurry uniformly with BEECK Quartz Filler.
Beeckosil FineOne-pack active silicate system to VOB/DIN 18363 2.4.1. Ready-to-use one-pack water-glass paint with an absolutely mineral profile. For permanently representative façades made of render, brick, calcium silicate masonry and concrete. Thin with BEECK Fixative. Use BEECK Quartz Filler, alternatively Beeckosil Coarse, to apply a slurry base coat to substrates with hairline cracks and structural defects.
Oil PrimerUniversal oil primer for absorbent wood Resin linseed oil primer for rough, absorbent woodwork. Can be equally used for dimensionally stable, dimensionally unstable and conditionally stable hardwood and softwood, such as windows, external doors, panelling and half-timbering or trusses. Not for tropical wood, test before using on oak. Further treatment with BEECK Undercoat, BEECK Exterior Stand Oil Paint, Interior Stand Oil Paint or with BEECK Stand Oil Wood Glazes.
Exterior Stand Oil Wood GlazeColoured glazing treatment of exposed wood Waterproof, resin-free stand oil boiled down mixture with finely ground mineral pigments, silk gloss finish. 15 standard colours for dimensionally stable, conditionally or dimensionally unstable woodwork such as windows, external doors, panelling and half-timbering and trusses. Ensure constructive wood preservation and wood quality free from blue stain.
Further information on this and other examples of use are available from: