Regular roofing with curved-end slates (Bogen - deckung)

Regular roofing with curved-end slates

The roof is covered on one side with rectangular slates with a curved end. Here we make a distinction between right-positioned (with the curve on the left) and left-positioned (with the curve on the right) slates.

Underlayment
Full-surface sheeting, nailing building boards, nailing masonry.

Fixation
Each slate - above 45° - must be secured with at least three roofing nails treated against corrosion (galvanized).

The shape of the slate

Dimensions:

These are the most common sizes, however, sometimes it occurs that certain mines produce slates with different dimensions (e.g. 35/35 cm). The quantities refer to a 45° roof, which can be different depending on the location of the building, the climatic conditions and so on.

Step lapping
Roofing is performed with a stap lapping. It is important to pay attention to the impact of the minimum row lift corresponding to the inclination of the roof.

Overhanging
The undergoing walls must be built precisely along the rakes, hips and ridges. The overhanging sides must overhang min. 5 cm at the rakes, hips and ridges.

The eaves gutter is covered with a bonded starter row or it can also be a post-installed gutter. For a more economical material utilization we recommend post-installment.
In the case of bonded eaves the starter rows run the opposite direction as the covering rows, hanging 6-8 cm over the gutter. When laying the first row you have to pay attention to start laying the covering rows early enough to see their back. Here you have to take the fact into account that this type of roofing is regular. In addition, you have to be careful to place the covering slates and the starter slates on the connecting slates so that they butt together with their backs to each other. With a bonded eaves gutter you have to use the so-called rough slates which are of different sizes.  
In the case of a post-installed gutter the first row of slates is laid horizontally, in a way that it hangs 6-8 cm over the gutter. The next row has to be trimmed to fit the horizontal row of slates, with a 8 cm overlap.
As for the post-installed gutter you do not need slates of different sizes.

Covering the rakes
Every straight rake must be covered after it is completely finished. Overlaid edges are to be avoided in case of straight rakes because it endangers the water-resistance of the roof. The slating of the rake by letting the connecting rows overhang (overhanging rake) is not considered as an exacting roofing solution from a professional point of view. There are particular rectangular (Rechteck) slates available to cover the rake with.

The fastening of the slates on the rake is done shifted with four or five roofing nails treated against corrosion.

Covering the starter and end edges on the hips
On slating the edges of the hip it is always a rule that they should be tiled bonded. The starter edge has to be properly positioned or it can also be implemented by inserted slates. The end edges can be double edges and there are rectangular end slates (Rechteck) available as complementary elements, just like in the case of a straight rake. The hips can be also bordered by an overlaid row.

The most important thing for a bonded edge is selecting the right row lift. The row lift has to be calculated so that the last slate should run roughly parallel with the hip. A smaller disalignment of the parapet line is tolerable. The row rise specified this way is bigger than the minimal row rise arising from the roof pitch. You also have to be careful not to exceed the maximum allowed row rise.

The shape of the coverage of the starter edges depends mainly on the row rise determined by the closing edges. Thus this kind of roofing will be similar to that with a straight rake only in case of a deviation from the smaller parallel of the hip (pitch roof). The starter edge consists of a post-installed (or several inserted) element and an element of the starter row. The installation of the intermediate elements is necessary.
With this kind of hip tiling you have to face another difficulty: the slates of the starter edge are not equally long because of the slanting hips. Thus they will not butt together with the slates beneath them. In this case we need to choose another tiling method for the starter rake.
These difficulties do not come up in case of the tiling of a starter edge that is bonded in standing position. The 30/30, 40/20, 50/25, 60/30 and 50/30 cm rectangular slates (Rechteck) used here are placed perpendicularly.

The slating of the ridge
The ridge row is the row that is laid in the same direction as the slates of the roof itself. It is best if you use unpunched 30/30 cm or 25/25 cm curved-end slates, in accordance with the pattern used in the coverage. The fixation of the slates on the ridge is done shifted under the lateral lap with 3 to 4 galvanized roofing nails.

Covering the wall edge
The starter edge is tiled as a bonded edge with curved-end inserted and edging slates. The closing edge should be implemented as a bonded closing edge with inserted and edging slates. There are 40/20 cm and 30/20 cm or 40/25 cm and 35/25 cm rectangular (Rechteck) slates avaialable for the tiling of the edges. The edges can be covered as overlaid edges.

The bottom edge of the wall
It is advisable to install a 5 mm thick batten or a triangular batten on the bottom edge of the sheeting so that we can prevent the 'optical declination' of the first row.