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French type roofing

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French style roofing is done by laying 40x40 cm. slate slabs, with all four corners trimmed. The characteristics of this type of roofing are essentially two: one is technical, due to the particularly light weight (55 kg/sq.m.); the other is aesthetic because of the singular shape the slab takes on after the corners have been cut. The light weight mentioned above allows this type of roofing to be used on particularly thin structures but having a pitch greater than 40%.
It is called “French” because it is widely used in France, and its use is widespread in Italy too.

  • Slate slabs: 40x40 cm, 13 mm thick
     lopped off on all four corners 
  • Fixing: 11 cm hooks in stainless steel or
    copper, 4 mm diam.

Advantages of slate roofing
Works of perfection
In the enlargement: detail of the copper wall flashing that prevents water seepage.

A – slab length and width = 40 x 40 cm
B – slab diagonal = 47 cm
a – lopped off side = 10 cm
b – slab overhang from 1st vertical lath = 5 cm
C – half slab diagonal length = 23.5 cm
D – starter slab diagonal length = 28.5 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 = 11 cm
P – horizontal lath gauge = 18 cm

Requirements for covering 1 sq. m. of roof:
- 11 slate slabs 40 x 40 cm + 11 hooks
Total weight per 1 sq. m. of roof = 55 kg