Terracotta facade panel

What is a terracotta facade panel?

A terracotta facade panel is a thin fired-clay cladding unit hung on a rail substructure to form the outer skin of a ventilated wall. In Slovak the term is terakotový fasádny panel. The panel is not a wall and does not carry the insulation. The wall behind it carries the structure, and the panel protects it from weather. The ventilated facade article explains the full wall build-up.

The ArGeTon system in BBA Agrément certificate 22/6507 shows a typical product. It comprises ceramic panels fixed to the substrate via vertical or horizontal aluminium support rails and purpose-made aluminium clamps or clips. The manufacturer CE marks the panels to EN 14411 (in the UK edition BS EN 14411:2016). The figures in this article belong to the named products and not to every terracotta panel.

What sizes and weights do terracotta panels have?

The size and weight differ between products. The table shows three products with the source of each figure. The FAVEKER FV kit is made of extruded ceramic tiles to EN 14411. Its ETA does not call them terracotta, so it appears here only as a comparable ceramic rainscreen product.

Product	Thickness	Size	Weight
ArGeTon terracotta, BBA 22/6507	30 mm nominal	Height 150 to 400 mm, length 150 to 1500 mm	Maximum dry mass 50 kg/m²
NBK TERRART-LIGHT, listing on baukobox.de	24 or 28 mm	Height 150 to 500 mm, length 100 to 1800 mm	38 to 42 kg/m²
FAVEKER GA16, GA20, GA30, ETA 16/0645	18, 20 and 30 mm	Length up to 1800 mm	31.7, 34.4 and 47.0 kg/m², each with a tolerance of 10 %

Weight matters for the substructure. The rails and brackets must carry the panel weight, wind load and the weight of the clips. The ETA for FAVEKER FV notes that the fixings between the brackets and the substrate are not part of the kit. The designer must size them for the wall behind.

How does a terracotta panel sit on a ventilated facade?

The panel does not touch the insulation. Clips or clamps hold it on rails, and the rails sit on brackets fixed to the wall. In the ArGeTon system all sub-frame parts, meaning clamps, clips, rails and brackets, are aluminium grade 6063-T6. The brackets have slotted holes for alignment. The FAVEKER FV kit uses stainless steel clips with aluminium small rails, or aluminium continuous profiles, on aluminium brackets and vertical profiles.

An air space separates the back of the panel from the insulation. The BBA certificate gives at least 38 mm for the baffled and labyrinth joints. It refers to a UK site standard, NHBC Standards 2022, chapter 6.9. Do not copy that value into a Slovak design without checking the producer's Slovak documents. The facade substructure article covers thermal bridges at brackets. The rainscreen cladding article covers the principle.

The certificate also asks for a thermal expansion gap of 2 mm per metre of rail length between adjacent aluminium rails. It states that the supporting wall must be weathertight and reasonably airtight. For framed walls and insulation it names a vapour permeable membrane against wind-driven rain.

How do the joints work?

A terracotta rainscreen is not watertight. The BBA certificate calls the ArGeTon system not watertight but intentionally baffled jointed and labyrinth jointed, back ventilated and drained. It uses 8 mm and 10 mm baffled vertical joints with aluminium drainage profiles, and 12 mm labyrinth horizontal joints. Open joints that must stay unblocked need a minimum gap of 10 mm between panels.

The ETA for FAVEKER FV states the same principle: the joints between the cladding elements are open, therefore the kit is not watertight. Because of that, it advises that the first layer behind the air space, such as the insulation, has low water absorption. Water that passes the joints must drain and dry in the cavity. A blocked cavity removes this drying path, so the vents at the bottom and the top must stay free.

What fire class does a terracotta panel have?

The sources give the class for the ceramic element and for the kit. The table shows what each document states.

Item	Class	Source
ArGeTon panels, rails, clamps and clips	A1	BBA 22/6507, section 7.1
FAVEKER ceramic cladding elements	A1	ETA 16/0645, Annex 1 Table A1.1
FAVEKER kit with small rails and no EPDM joint profiles	A1, EN 13501-1	ETA 16/0645, section 3.1
FAVEKER kit with clips and EPDM joint profiles	B-s1,d0, EN 13501-1	ETA 16/0645, section 3.1

The FAVEKER classes are valid only in two cases. Either the insulation behind the cladding is non-combustible, for example mineral wool, or the layer behind is a mineral substrate like masonry or concrete. With EPS, XPS, PUR or PF insulation, the ETA states that the wall cladding takes the reaction to fire of the insulation. The ETA also notes that no European reference fire scenario exists for facades. It adds that an additional assessment under national provisions, for example a large-scale test, might be needed. This article does not state a Slovak facade fire rule. The fire safety designer of the project sets the requirement.

How is terracotta cladding maintained?

The BBA certificate sets out three tasks. First, clean the surface at regular intervals. Hot water and a household detergent mixture, applied with a cleaning pad or sponge, is enough for normal soiling. For difficult chemical soiling, ask the certificate holder. Second, inspect every year that drainage channels are in good order and that the panels, flashings and seals are in place and secure. Third, replace damaged panels as soon as practicable. The metal clips allow one panel to be replaced without disturbing its neighbours.

The FAVEKER ETA lists what an inspection looks at. For the cladding elements these are cracking, detachment, delamination, mould from permanent moisture and permanent deformation, with attention to the corners. For the metal parts these are corrosion and water accumulation. A local fix uses the same components and follows the producer's instructions. The BBA certificate states a service life of more than 35 years in normal UK conditions. The FAVEKER ETA assumes a working life of at least 25 years. Neither is a guarantee.

What drives the cost of a terracotta facade?

The sources opened for this article give no prices, so none is stated here. They do show what the price covers. A terracotta facade is a system. The ArGeTon certificate lists the panels, the aluminium rails, the clamps and clips and the drainage profiles as parts of one supply. The panel thickness and format change the weight, and the weight changes the rails and brackets. The ArGeTon certificate lists smooth, glazed, engobe, riven, brushed and wire dragged finishes in 26 colours. Edges, corners and openings need their own trims.

Compare quotes for the whole system, including the substructure and the work at openings. A quote for the panel alone leaves out the larger part of the work. Other cladding on the same substructure, such as a metal composite panel or fibre cement cladding, should be compared on the same basis.

What does Slovak law require for a panel placed on the market?

A terracotta panel is a construction product. Zákon č. 133/2013 Z. z. o stavebných výrobkoch sets two routes to the Slovak market. A product must meet either the harmonised conditions under a special regulation or the conditions of that act (§ 2 ods. 1). If a harmonised standard or an ETA gives the parameters, the act bars Slovak standards and the SK technical assessment (§ 2 ods. 2). The Slovak Trade Inspection supervises the domestic market and checks products placed on it (§ 19 ods. 1).

The building act sets the duty for the building. Zákon č. 25/2025 Z. z. (Stavebný zákon) requires that a building meets the basic requirements for structures for its whole service life (§ 18 ods. 1). It also requires construction products and materials suited to the intended use (§ 19 ods. 2). For a cladding panel, the designer should show that the declared performance fits the place of use. The acts set the duty. The performance values come from the product documents.

What are the common misconceptions about terracotta cladding?

• A terracotta panel is waterproof on its own. The system is not watertight. The joints are open or baffled and the cavity drains and dries.
• All terracotta panels weigh the same. The sources above show 24 to 30 mm thickness and weights from about 32 to 50 kg per square metre. Take the figure from the chosen product.
• The panel carries the insulation. The panel is a skin. The wall or the substructure holds the insulation.
• A fire class of the panel is the fire class of the wall. The class of the wall depends on the insulation behind the cavity.