FAQ

Obviously, installing six large tiles takes less time than installing 14 small tiles. Based on experience, the time-saving is around 10% to 15%. You also need less time and material for the battening (covered length: 50.4 cm). Assuming a rafter length of 9 m, you need 9 fewer battens than with smaller tiles with an average covered length of 34 cm.

The low weight per square metre of the "DS 5" (around 36 kg/m2) puts less strain on the roof structure than roofing with smaller tiles – around 10 kg less per square metre. You therefore do not need such a strong structure. If you are reroofing, the existing structure, which may only be able to carry lighter loads, is often sufficient.

A large tile size means less cutting work for the hip and valley areas as the number of tiles to be cut is reduced by a third. Tile edges that need to be inserted are larger and therefore easier to handle.

When reroofing, or when the spacing between the battens is not exactly correct, using the Nibra DS 5 means that you do not have to cut the tiles because their specially designed edge allows for variable overlap (around 6 cm).

The average covered length is calculated by laying out two rows of twelve tiles from different lots side by side and upside down. In one row the length is measured with the edge pulled out to the maximum, in the other with the edge pushed in to the minimum. Measurements are done from the bottom edge of the nose of the first tile to that of the eleventh tile.

Accessories from different manufacturers should not be used on the same roof. If they are, any liability or warranty becomes invalid.

A rule of thumb is that the larger the provider, the larger the range of products, colours and shapes they offer.

You can find the appropriate Nelskamp accessories together with each product.

Because of the increased requirements, if the roof pitch is ≥10° lower than the rated minimum roof pitch a waterproof underlay is definitely needed.

It is better to be safe than sorry. Additional measures afford better protection. In locations with extreme weather conditions a waterproof underlay should always be used instead of a rain-resistant one. Waterproof underlays are also suitable for climates with frequent freeze-thaw conditions, even if the roof’s inclination is only slightly below the rated minimum pitch. This is because such conditions often lead to ice forming at the bottom of the roof. With a waterproof underlay, water on the surface does not seep into the roof structure even if it stands for long periods.

A frequent source of problems is insufficient care with the underlay and when applying the underlay to roof transitions and connections. The underlay must be carefully connected to the roof drainage system, and there should be no areas where water can collect

  • All seams and edges of the material should be waterproof.
  • Through-passes, integrated components and roof edges should be made rain-resistant.
  • In ventilated constructions, the rain-resistant underlay should not end further than 30 millimetres from the centre of the ridge.
  • All openings must be covered.
  • A waterproof underlay has no openings and can therefore only be used with unventilated roofs.
  • As with the rain-resistant underlay, all material edges, seams, through-passes, integrated components and roof edges parts should be watertight.
  • Sealing should be done over the battens so that their attachment does not damage the underlay.
  • The underlay strips should be attached in the upper third of their coverage.
  • The underlay must be connected to the roof’s drainage system.
  • It is recommended that the eaves are encased and the gutters are placed high on the eaves.

Yes, if the additional measures prescribed by Nelskamp or the industry standards for the respective tiles are respected. These could include various types of underlays or sub-roof constructions. The clay Nibra tiles or concrete Finkenberg Tile are particularly well-suited for low-pitch roofs.

Engobe is a coating for tiles made from a clay suspension; it can also contain metallic pigments. Engobes are diluted in water, coated onto the raw tiles and then fired in the oven. Their capillary structure is similar to that of the tile.

The smooth and shiny surface of vitreous engobes is breathable. Vitreous substances are added to vitreous engobes; these melt in the oven and fuse with the tile but without forming a continuous layer of glass. The surface allows diffusion, improving the drying process. Glazed tiles are covered with a layer of glass which seals the surface.

The "Longlife" surface of Nelskamp's concrete tiles is very smooth, with few pores even on the visible edges. Even fine dust can hardly get a grip. While on other surfaces the water rolls off (hydrophobic), rain water completely covers this (hydrophilic) surface, washing dirt away. Long-term tests conducted outdoors have demonstrated that these roofs stay cleaner, and that their colours stay vivid longer than conventional concrete tiles. Only around 7% of an applied layer of dirt sticks to Longlife tiles, while the figure for other concrete tiles is around 50%.

ClimaLife is the name of Nelskamp's special surface for concrete tiles. It contains titanium oxide, which transforms harmful compounds in the air into harmless nitrates. All that is needed is some UV radiation to convert nitrogen oxides (NOx) into nitrate (NO3), for example, throughout the entire life of the roof. The nitrate is simply washed off the roof by the rain and serves to fertilize plants. The surface also has few pores (see Longlife), so algae and moss cannot easily get a foothold. The roof always looks as good as new.

Nelskamp guarantees its concrete and clay tiles for 30 years for water and frost resistance. This is certified by the DINplus label.

Nelskamp products are only sold through building material stores.

Concrete and clay tiles provide the same high quality. The decision largely depends on the characteristics of the building and on the preferences of its owner.

Clay tiles offer a wide range of variations – small or large, natural colours, steamed or with a coloured engobe. Clay tiles have been used on roofs for centuries. The material is traditional, timelessly attractive and comes in a large variety of tones.

Concrete tiles are a low-cost, technically high-quality alternative. They stay clean for a long time (Longlife) and protect the environment by removing harmful substances from the air (ClimaLife). Their production also requires much less energy.

RAL colours are a standardized set of colours used by industry. Each colour is identified by a four-digit number (for instance, the 3000 numbers are reds). The advantage of this system is that one no longer needs to exchange samples to agree on a colour, as each colour is clearly defined.

Due to the materials used and the production process, clay and concrete tiles cannot be made according to RAL specifications. Their categorization here is therefore subjective.

The colour of the roof is often prescribed in planning laws and differs from place to place. An alternative colour must be approved by the responsible authority. Our consultants will be happy to support you with this locally.

We will be happy to provide you with information on showcase buildings over the phone:

Tel.: +49 (0)2853 91300

Or by E-mail: vertrieb@nelskamp.de

In Germany new laws came into force in 2011 regarding wind resistance. They prescribe storm fastenings even in less windy areas. For every roof built or renovated after 2011, a calculation needs to be made to determine if, and how many, fastenings are required.

H 15, F10 Ü or MS 5? The names of the tiles may seem confusing at first, but they mean something; the letters indicate that the tile is a:

  • H - pantile (Hohlfalz)
  • MS - trough tile (Muldenfalz)
  • F - low-pitch roof tile (Flachdach)
  • G - flat tile (Glatt)
  • R - Rheinland/Reform tile
  • D – double-trough tile (Doppelmuldenfalz)

The numbers behind the letter indicate how many tiles are needed per square metre.

The appended "S" and "Ü" mean "adjustable" (VerSchiebziegel in German) and "overlap" (Überdeckziegel in German). Both can cover a variable surface area and can be adjusted by up to 10 cm. This makes them very economical, and great for roofs with many different sections.

Lattices, wood or double-pipe holders act as snow retainers to keep the snow on your roof. Snow retention systems can easily be retrofitted.

"Nibra" is the name of the Nelskamp works in Groß Ammensleben near Magdeburg; it is also the name of our large tiles. They are made from Westerwald clay. This, and the modern production processes, make Nibra large tiles particularly robust, frost-resistant and with a water absorption rate of less than three percent.

The best orientation is facing south, as this maximizes the amount of sun received over the day. An orientation to the south-west or the south-east also yields good results. Solar energy systems should not be installed facing north, because their yield will be minimal. The location of the house also plays a role.

When the sun is shining, the 2Power modules generate both electricity and warm water in one module. Around eight modules are needed to provide enough warm water for a three-person household if the orientation is optimal. If it is also intended to support the heating system with the 2Power installation, more modules are required, depending on the size of the house.

To cover the (calculatory) electricity needs of an average three-person household, some 16 to 20 modules are needed depending on the location. Eight of these would be 2Power modules while the remaining eight to twelve would be PV-only modules, but with the same appearance.

A shaded roof surface generates less electricity. An analysis of the roof should be conducted, and the causes of the shading (e.g. tall trees) removed if possible. If a neighbouring house is the source of the shade, you should think about installing the system somewhere else. The negative effects of partial shading during the day can be minimized by good planning of the strings.

There is no universal answer to this question. It depends on the building and on local laws and regulations. Exemptions to the rules have frequently been made for our SolarPowerPack (SPP) and MS 5 2Power or MS 5 PV systems.

 

 

The two systems look identical, as the modules for both of them are integrated into the MS 5 tile. The difference lies in their technical specifications: the MS 5 PV is a pure photovoltaic system, while the MS 5 2Power generates both electricity and warm water.