A lot of countries
do not have reguiations specifying the execution of a waterproof
covering in civil and industrial buildings, both if it is made of
multilayered bitumens and membranes. The same is true for the types
of accessories such as drain mouths, aerators for ventilation and
siphoned welis.
In such a situation, almost always sector workers have to decide
to lay the accessories they can find on the market, such as mouths
made on inappropriated materials and offlmited duration, with flanges
unsuitabie for the connection of manties shafts without fins for
the adhesion to drain pipes (gaskets) or with very conical shafts.
Then, it is natural that inconveniences can occur, such as the disjunction
of mantles from accesseries, the overflow in case of duct obstruction
with consequent damages, cases of steepage of steam or masses of
water, the reduction in the capacity of drain pipes downhill, because
of the conicity of mouths.
C 0 N C L U S I 0 N
Considering the importance of the roof
drains and the accessories in waterproofed coverings, ITALPROFILI
believes that they should have the following characteristics to
fulfil their functions, to offer a duration guaranty and, of course,
to reach the aims of their utilization.
a) They should be made
of materials (thermoplastic rubber or synthetic rubber, if possibie)
that can stand various temperatures, the degradation caused by
the sun, the ozone, the atmospheric and chemical agents and maintain
flexibility at low temperatures and stability at high temperatures,
ensuring, in this way, a perfect efficiency for many years.
b) Their conformation wili have the
following characteristics:
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1) Mouth: a single piece
with fliange and shaft.
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2) The diameter of the
entrance pipe (start of shaft) shall be greater than the diameter
of the descending pipe (downspout). The shaft shall not be conical.
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3) The flange with dimensione
of at least 12 cm. beyond the circumference of the entrance
pipe, shall be flexible and its shape shall be suitablie for
the connection of membranes and material compatible with them.
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4) The length of the
shaft (sleeve) shall be the same as the thickness of the load
bearing support plus 15 cm. to be inserted in the descending-pipe
bell.
Leafguards and/or gravelguards shall have
a greater diameter at the mouth entrance and the entrance capacity
of grille holes shali be at least 30% higher than the drain pipe
capacity.
In states of fact, or in old coverings, it happens that the rain
pipe skimms or is few centimetres under the piane to be waterproofed,
so you are forced to use mouths with short shafts, which must
not be conical, otherwise the capacity of the rain drain below
is reduced.
They must contain the flexible, incorporated and well positioned
flanges in the same shafts, which must exceed the diameter of
the descending pipe.
The insertion shall be by pressure, so as to prevent possible
overflows of steam or masses of water.
To conclude, the choice of accessories such as roof drains, aerators,
etc. is of vital importance to obtain a positive execution of
waterproofed coverings.
N.B.:
All dimensions are in millimiter and have a tolerance ±
2.
All our products are covered by a ten-year insurance policy.
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