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Triple roofing

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This covering withstands time due to its triple slab overlap. Its simple geometric form creates a continuing design of horizontal parallel lines, underlined by thin shadows which further highlight the geometric composition of this type of roofing.

Its applications extend, throughout time, from the bell-shaped roofs of spontaneous architecture to those of the most recent residences, found on the Mediterranean coast as well as in Alpine valleys. This is because slate reacts in the same way to ocean spray and to loads of snow during the long winter months. The quick replacement of a slab, if it breaks, is possible because it is easy to replace a slab of equal size and shape.

  • Slate slabs 57 x 40 cm, 9/10 mm thick or
    57 x 30 cm, 9/10 mm thick
  • Fixing: 19 cm hooks in stainless steel or
    copper, 3 mm diam., better if 4 mm diam.
In the enlargement: detail of the copper riser that prevents water seepage.

A – slab length = 57 cm
B – slab width = 40 cm
a – lopped off side = 7 cm basic
b – slab overhang from 1st row of horizontal lath = 16 cn ca.
C – half-slab diagonal width = 20 cm
D – starter slab diagonal length = 38 cm
E – exposed slab length and width = 30 x 30 cm
F – vertical lath distance = 60/70 cm
G – size of horizontal lath = 4 x 3 cm (starter shim 4 x 4)
H – length of hook = 19 cm
P – horizontal lath gauge = 19 cm

Requirements for covering 1 sq. m. of roof:
- 13 slate slabs 57 x 40 cm + 13 hooks
Total weight per 1 sq. m. of roof = 75 kg