What needs to be observed during lengthy periods of storage of the Montana products?
The instructions given on the package labels for the storage of Montana products must be followed. These state that the packages must be stored in a dry, well-ventilated place. Standing water between the elements must be avoided as this will inevitably lead to damage, even in the case of sheets metals with an anti-corrosion coating. As a matter of principle, the duration of outdoor storage must be kept as brief as possible. In particular during the summer months, the large temperature differences between day and night can lead to the formation of condensation in the stack. This condensate is trapped between the components and cannot evaporate, regardless of whether a colour protection film was used or not. In addition, high temperatures during the summer months greatly accelerate the corrosion process. If the storage conditions are inappropriate, therefore, white rust can form in a matter of days. In most cases of white rust, neither a serious deterioration of the zinc layer nor a shortening of the expected service life of the product is to be feared. Nevertheless, the formation of white rust is perceived as an aesthetic impairment and is therefore to be avoided if possible.
In order to avoid the white rust problem, Montana Building Systems Ltd. recommends that you install the products concerned promptly, at the latest within 4 weeks of the date of manufacture, and remove any colour protection film immediately after the installation process. If the colour protection film remains on the products for too long, this can lead to restrictions in the removal of the colour protection film (increased effort for removal, adhesive residues on the surface, etc.)
What should be considered when choosing a coating system in combination with photovoltaic elements?
The use of roofs of industrial and commercial buildings for energy generation is increasingly becoming standard practice. It should be noted that this results in increased requirements due to the accumulation of dirt and moss, as these surfaces are subject to a reduced cleaning effect due to natural precipitation, reduced air circulation below the PV modules and increased relative humidity with standing moisture. Simple coil coatings have not been developed for this application, which is why damage is to be expected even before a PV system pays for itself due to the extraordinary load. The costs of a repair are significantly higher than for a non-solar roof, because in addition to the loss of income from the PV system, additional costs for the disassembly and reassembly of the system must be added. Such costs are not covered because the usual guarantees for prepainted steel are usually only valid for roof coverings that are exposed to the elements and any guarantee claim is void if superstructures are installed on the roof surface, such as PV systems.
In order to offer building owners absolute safety and to meet the extended requirements of sustainable buildings, we recommend the use of the premium coating Colorcoat PRISMA® in such cases. Specially designed for PV applications, there is a PV addendum to the established CONFIDEX® warranty, which enables a warranty period of up to 40 years. Thus, both the life expectancy and the guarantee period of the coating easily match the planned payback period of a photovoltaic installation. Please contact us for data sheets or assistance in applying for the CONFIDEX® warranty.
What is the Confidex® Guarantee?
Offers the most comprehensive guarantee for pre-finished steel products in Europe and provides peace of mind for up to 30 years. Unlike other guarantees Confidex® covers cut edges for the entirety of the guarantee period and does not require any inspections or maintenance during this time.

Key features of the Confidex® Guarantee: 
  • Covers cut edges for the entirety of the Confidex® Guarantee period.
  • Uses simple colour performance bandings without reductions for orientation.
  • Allows a single guaranteed figure of up to 30 years to be attributed to the whole building envelope.
  • Does not distinguish between different roof pitches down to 1°
  • Is offered directly to the building owner, providing a contractual relationship between Tata Steel and the building owner.
  • Is fully transferable should the building ownership change.
  • Helps to reduce the level of risk for each part of the supply chain. 

Confidex® Guarantee Period for Colorcoat Prisma®

  1. Figures under the coastal heading are for buildings whitin 1 km of any coast.
  2. The Confidex® Guarantee periods on the diagramm above are applicable to Germany, Austria and Switzerland.

Register the Confidex® Guarantee: Form
What needs to be observed when cleaning coated surfaces?
Occasional soling of the component surfaces cannot always be avoided despite the care taken, so that subsequent cleaning is necessary. Please observe the following during assembly to keep the additional effort as low as possible:
  • Work diligently, avoid soiling and damage to the coating, particularly when separating coated components.
  • Leave any possibly existing protective film on the components during assembly; however, please make sure to remove the protective film immediately after completion of the work.
  • Remove borings immediately – preferably by blowing off. This avoids later corrosion from the effects of moisture (crevice corrosion).
  • Remove soiling before drying if possible; this particularly applies to tar and bitumen runs.

We refer to the guideline of the Swiss Centre for Windows and Facades SZFF 61.01.

Before cleaning, an appropriate small test area should be cleaned first. Particularly stubborn soiling must be examined to determine a suitable cleaning agent and the further procedure depending on the result.
What needs to be observed when touching-up coated surfaces?
Touching-up is the partial post-processing of occasional scratches that may occur through assembly. Appropriate touch-up paints are available for all conventional coating systems for this purpose.        

Before commencing the work, please note the following:
  1. Make sure which coating system you have (polyester, PVDF, etc.)
  2. Limit the work with the touch-up paint to an absolute minimum!
  3. Only treat damage that has reached the base material!
  4. Clear the area to be touched up before working on it, as it must be clean, dry and free from grease!
  5. Use a fine brush to keep the area to be touched up as small as possible!
  6. Use the touch-up paint sparingly, such that the treated areas are not recognisable from a normal viewing distance!
Where do creaking noises from building components with wooden substructures come from?
Creaking noises occur above all through sun radiation, for example during the cooling down of light metal roof or wall elements, whereby the elements themselves do not generate any noise whatsoever.
Due to the stable connection of building elements with the substructure via screws, temperature stress occurs that either shows by means of deformations, sliding displacement or, in the event of intense friction between the building element and the substructure caused by jerky displacement, by developing noises.
In multiple-shell systems such as e.g. a roof system consisting of two metal shells, thermal stress of the outer shell is diminished within the roof system via the relatively flexible intermediate Z-profile structure, such that creaking noises occur less frequently and are not as loud.
In the case of sandwich elements with a PUR/PIR core and metal cover layers, there is however, a "shear-resistant" connection between the outer and inner shell. As a result, an internal reduction of tension is only possible to a certain extent, and noises are heard more frequently. Due to the relatively low mass of the outer plate of the sandwich element, it heats up and cools down quickly, such that dilatations and/or contractions occur as a result.
Creaking noises in relatively cost-effective roof and wall systems for commercial and sports buildings cannot be reliably avoided and must therefore be considered to be normal. They do not substantiate a defect.
Is it possible to repair Montana fleece?
Montana fleece is a plastic-based fleece coating applied to SWISS PANEL® trapezoidal and corrugated profiles, which are able to store occasional condensation water. This prevents dripping condensate.
Soiling should be carefully removed with a soft water jet and a soft brush. Damaged points can be removed using a sharp cutting tool, e.g. a carpet cutter and a scraper. Small pieces of fleece can be used to glue over the cleaned surface.
Large areas that need touching-up are hardly possible due to the strong gluing effect of the adhesive beyond the profile ribs.
If the fleece has come loose due to improper use or a missing capillary barrier, then the use of a spray adhesive is recommended for repair. Please ask for further support in this case.
What is chalking and how does it occur?
Chalking, loss of lustre and change of colour occur through years of weathering and influence the appearance of a coil-coated surface of building elements.
Chalking can be considerably reduced by using higher-quality coating systems. Simple polyester coatings for example chalk out much faster than a high-quality Colorcoat PRISMA® coating, which convinces by much higher UV and corrosion resistance properties.
Chalking is recognisable by the opaque whitish surface of the coatings. Slight rubbing e.g. with a finger leaves a whitish residue. This residue consists of weathered polymers and the light filling materials. Chalking must not be mixed up with bleaching. Bleaching is the loss of the colour of a pigment. Chalking however shows the destruction of the binding structure of the organic paint layer.
If paint is cleaned properly by washing off the chalking and is additionally preserved e.g. similar to car paint, then the paint surface becomes darker again, re-harmonizing with the former colour tone.
Which differences in colour tone must be accepted?
Unfortunately there is no production method without tolerances; therefore the repeated manufacture of an absolutely identical colour tone for building elements is practically impossible. The RAL system does not specify any limits, beyond which a RAL colour tone is no longer one.
The RAL register and/or the RAL cards in it do not document an exact colour tone. A RAL card can therefore not be used as a reference for differences in colour tone agreement and can only be applied as a general guide.
Identical colour tones look different on different substrates such as e.g. plastic, wood, metal, in particular also due to different roughness grades and the type and intensity of light incidence. Different application methods such as coil coating, spraying, painting or rolling, and different paint bases also play a role.
The assessment of the colour tone difference of samples with slight colour tone deviations frequently leads to different conclusions when several different assessors are involved. For the sake of clarity, the still permissible deviations must be exactly described; two samples must be agreed upon – “limit samples“ – between which the agreed design must be recognisable.
Within a closed area, a mainly uniform colour tone should be given; colour tone deviations in e.g. two surfaces meeting in a corner or “separated“ by joints, edge profiles, etc. are usually not distracting and do not represent a defect.
We point out that colour deviations in all colour tones within certain tolerance limits must be accepted when using different material batches. In case of any doubt we always recommend to have the ordered material produced from one material batch. Montana Building Systems Ltd. shall not be liable for colour differences between products from Montana amongst one another and between products from Montana and those of other manufacturers. This applies for all colours and all pre-painted products. When various products or coatings are installed with one another and need to have the same colour tone, then a selection must be made.
In the case of metallic paints and light paints that therefore do not cover well it must generally be assumed that there will be colour differences between different deliveries.
What do we understand under the term ‘erosion rate’?
A surface layer of corrosion spots, the so-called patina, forms during the course of time on uncoated zinc sheet that is exposed to atmospheric influences. Its composition and characteristics are determined by the prevailing concentrations of air pollutants and the environmental conditions.

Part of the patina may be loosened and eroded from the surface as a result of dry and wet deposits. Only this small part of released metal is referred to metal erosion.

The corrosion process is mainly influenced by the sulphur dioxide content in the atmosphere and, as this has drastically declined, erosion has also been sharply reduced. Today, erosion is far less than it was only a few years ago.

Erosion water from a roof or building is typically directed to a wastewater treatment facility through downpipes or it trickles away aboveground or underground. In doing so it comes into contact with organic or inorganic material (for example limestone and soil) in the immediate vicinity of the roof, which leads to significant changes in the chemical component formation.

The bioavailable portion of copper and zinc is already substantially reduced in the immediate vicinity of the roof. This is confirmed in more recent examinations.

In order to obtain empirical values from examinations of galvanized and coated metals, please contact us.
Suspensions on trapezoidal profiles (lamps, building services, suspended ceilings, etc.) – what systems are available?
Suspension elements for building service elements such as pipes, cable ducts, lighting systems, etc. can usually be attached to the bars of the trapezoidal profiles without any problems.
Here it is important to take the additional weight into consideration when calculating the static dimensioning of the metal sheet. Furthermore, the selected suspension system must be sufficiently dimensioned with regard to statics. The various manufacturers (e.g. Würth, Hilti, Erico, Sikla, Roco, etc.) state the permissible load-bearing capacities in their data sheets.
How must trapezoidal sheets and corrugated profiles be screwed?
For structural reasons, the lateral sheet metal overlaps (longitudinal joints) must be screwed to the wall or roof approx. every 50 to 60 cm according to the distance between the purlins or cross-bars. The structural calculations of our different profile types are set out in our design tables.

Fastening of the profiles to the substructure depends on the existing span widths and the loads acting on them. Fastening to an end support in each rib and on the intermediate support in each second rib is usually sufficient. In case of any doubt or for large span widths and high influences (e.g. wind suction) please contact us directly.

For further information we kindly refer to our assembly recommendations.

What needs to be observed for longer profile sheets?

Depending on the material selection and sheet lengths, the expansion of the profiles must be particularly observed. This applies above all for longer aluminium profiles (> 6 m). In practice, fastening is done by means of a fixed screw connection in the middle and through large holes and additional calottes. For this, the installer of the sheets needs technical and specialist knowledge and the necessary skills.

The most reliable solution is with suitable sliding elements, for the prevention of noise, screw stripping, hole expansions, etc. The connections and ends must also be provided accordingly with sliding function by means of additional retaining clips or adhesive strips.
What needs to be observed for lightning protection on metal roofs?
No particular or additional intercepting devices for lightning are usually necessary for the formation of roof or wall components with metal trapezoidal or corrugated profiles. Profiled steel sheets from a thickness of 0.5mm (aluminium from 0.65mm) are considered as “natural constituents of an interception device“ acc. to DIN EN 62305-3. The prerequisite for this is that the profile sheets are joined together and to earth conductively. Structural details must be discussed with a specialist company for lightning protection equipment. Please contact us for further and more detailed information.
Stabilisation and reinforcement of the buildings and supports by means of trapezoidal profiles – how does it work?
Building envelope elements can be used for the stabilisation of entire buildings or individual building components. In particular, wind braces are not necessary if trapezoidal profiles are used for reinforcement via shear areas. For this, the shear areas, the trapezoidal profiles and their connections must be sufficiently dimensioned and statically verified. Shear area values for our SWISS PANEL® trapezoidal profiles are available.

Stability-endangered supports can also be stabilised by covering with trapezoidal profiles and sandwich elements.

Just speak to us. We will be pleased to provide you with further documents.
What needs to be observed when using trapezoidal profiles in swimming baths?
Particular requirements apply to steel components for the interiors of swimming baths due to the presence of high humidity combined with aggressive components (e.g. chlorine). Due to this special interior climate, we recommend the use of the Colorcoat HPS200 Ultra® coating system with a layer thickness of 200 µm (optimally on both sides). This coating system exceeds the maximum corrosion resistance class RC5 and the highest durability class for aggressive interior applications CPI5 as per EN10169.
It should also be borne in mind that, in addition to the selection of the right coating system, further structural measures are necessary, such as the sealing of the cut edges and the airtight sealing of all longitudinal and transverse joints with sealing tapes. There are different regulations for trapezoidal profiles with acoustic perforation.
Just ask us about this. Our employees will be glad to help.