A batten or support smoothing is a framework made of wooden slats at a defined distance to which the roof tiles or other roof coverings such as corrugated bitumen sheets are attached.
In the case of the roof, the support friction is usually nailed or mounted with wire pins on the counter battens underneath, but when laying panels, it is usually screwed. The distance between the slats is determined by the chosen roof covering and depends on the weight and type of material used. The support rails are often screwed transversely onto a counter batten, horizontally. Load-bearing smoothing is also known as economical formwork.
support rails have a cross-section of 30 x 50 mm (grading class S 10 according to DIN 4074-1), but from a center distance of the counterbattens of more than 80 cm, slats with 40 x 60 mm are usually used (grading class S 10 according to DIN 4074-1). For center distances of more than 1 m, a mathematical proof is required, the exact dimensions according to static specifications are specified in the ZVDH's "Notes on Wood and Wood-Based Materials" regulations.
The minimum cross-section of the roof battens also depends on the rafter spacing. In general, the greater the distance between the rafters, the larger the cross-section of the roof battens. Therefore, there are limitations of use for roof battens. For example, slats with a cross-section of 24/48 (S13) may only be used up to a maximum rafter spacing of 70cm and a maximum bearing rail spacing of 17cm.
The spacing of the support friction must be matched to the roof tiles or blocks used. Manufacturers of roof coverings usually specify how large the roof batten distance must be for the respective roof covering.
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