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Triple roofing +

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When the roof pitch is less than 40% (up to a minimum of 18%) a considerable overlapping of slate slabs is necessary to prevent the wind from blowing the water to the top of the slab, causing seepage; at the same time, to obtain the beautiful aesthetic results of “French” roofing, a triple covering must be made with slate slabs measuring 57x40x1 cm. with bevelled corners and with a 38 cm. overlap on the 2nd row. As can be seen in the photo, the beautiful aesthetic effect is the same as the “French” roofing, but since it is triple layer, it is much more resistant and prevents see page.

  • Slate slabs 57 x 40 cm, 9/10 mm thick, trimmed
    on the low side
  • Fixing: 19 cm hooks in stainless steel or copper,
    3 mm diam., better if 4 mm diam

Advantages of slate roofing
Works of perfection
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