The covering is the building element from the upper sode of the roof, with an isolation role of the building against the athmosferical agents.
The ceramic tile covering is one of the oldest type of covering ever known. It has to meet not only the tightness requirement, but also a series of requirements regarding durability, fireproffness, aesthetical aperance, etc.
It is very important for the covering to allow natural transition of water vapours inside outof the building, without these to condense, causing damages to the roof or the ceiling.
For the roof to meet all Your requirements, some demands need to be fulfilled:
– The roof slope needs to be within the specified limits of every type of covering. The inferior slope less than the accepted limit leades to loss of warranty;
– The covering needs to be filtered, in order to to allow the elimination of water vapours. For this reason, at the bording roof will mandatory have a longitudinal lath with dimensions 48×48 mm, which creates an air space between the boarding and the covering. In order to facilitate the acces and elimination of this air, the air ventilation pieces are used, to be mounted at least 1 piece/10 sqm, one piece being mounted in the second row of the eaves, the other one symmetrical on the second row beneath the ridge.
The disrespect of this requirement leads also to loss of the warranty.
Calculus of the rafter length
The distance between the horizontal laths ought to be respected rigorously, because a deviation of 2 mm can alter the aesthetics. The minimal dimensions of these laths must be 24/38 mm.
The side and ridge elements will be mandatory seized with nails and in the areas with lot of fog it is recommended that a larger number of tiles be used. In order to avoid the sudden falling and in a large quantity o the snow, that may lead to a degradation of the gutters, it is recommended the usage of parapets, which can be mounted, usually, in the second and the fourth row of the eaves, in zigzag. The number of parapets is to established according to the dimensions of the roof, respectively corresponding to the precipitations quantity (snow) during winter.
In order to prevent the water infiltrations through the nail hole, for the tiles that do not need their binding this way, the tile is pierced only 80%.
When hitting the nail (maximum diameter 1.5 mm) with the hammer, it is possible to have a partial degradation of the tile and for this reason we recommend that the tiles that are to put with nails are to be pierced completely, with a hole of 2-2.5 mm with a drilling machine, in the already existing hole and using the nail after that.
Most of the tiles made by SICERAM have support and binding zone, both in the upper part, on the laths and in the lower part, on the next tile row. And, due to the specific weight of the product, a binding only on the edge, on the perimeter, for the following tiles: Marsilia, Portugheza, Baltica, Francia si Carpathia is sufficient.