The installation of the waterproofing sheath with slate is governed by the standard EN 13707 " roof waterproofing ."sheath slated
The waterproofing work with sheaths must be performed on dry, clean and free from dust. Should be avoided laying in the event of rain, snow, fog and intense , however, when the outside temperature is below 5 ° C, because these environmental conditions may interfere in adherence of the membrane to the supports to be waterproofed (formation of bulges , bubbles, etc. . ) . Similarly, in the summer season , it would be desirable to prevent the installation during the hours where the insolation is greater.
The pose in " Total Adherence " of a membrane in modified bitumen represents the laying technique that makes the waterproofing membrane adherent to the support for the entirety of its surface by the total hot gluing with the use of flame generated by propane gas burner .
This installation technique is used without mechanical fixing on media with limited mobility and inclines up to 40% on roofs without thermal insulation and inclines up to 20% for roofs with thermal insulation.
In all configurations of installation ( single and dual layer ) sheets should be placed on the media in order to observe the following precautions:
- With covers having gradients sub-horizontal ( up to 5% ) or slightly inclined ( ≤ 10% ) , the laying direction of the sheets can be held in both transversal and longitudinal to the slope P , however, preferably the preparation of the waterproofing sheets must always start from the lowest point (near the exhaust outlet ) and then proceed upward unrolling the membrane along the laying surface so as to achieve the overlap in counter , to " tile " ;
- Configurations for double-layer the second layer ( upper layer ) must be positioned longitudinally with respect to the first layer , with a phase shift of overlaps between the first and the second layer and with a width wider than the width of the phase shift of surmounts .
- Towels must be staggered in the longitudinal direction or scalar , in order to avoid that the lines of junction of the ends of the sheets are parallel to each other (thus creating a single line spliced equal to the entire width of the cover to be waterproofed ) ;
- The sheets should be positioned so as to have a side overlap of at least 10 cm and of a head of at least 15 cm ;
- The corners are cut at 45 ° on the head of the membrane and across the width of the overlap of the head, in order to obtain an overlap perfectly closed , with seal even in case of movement ;
- The end overlaps the membrane with mineral self-protection must be carried out carefully by heating the surface to overlap the affected self-protected until full incorporation of the slate in blends to allow adequate adhesion between the sheets ;
- Rolls of membrane must first be laid on the installation to check the appropriate overlaps between adjacent sheets and proper parallelism between cloth and towel . Then , for the final pose , the membranes should be rewound to the center to half their length starting from the opposite heads . In the case of heat bonding the same should be paid initially and then roll on the front of the line of tangency between the roll and floor , providing at the same time the advancement of the membrane.
For the realization of a " continuous coverage " impermeable to air and water , it is essential to optimal execution of the laying of the sheets in the areas of overlap ( overlapped ) . It is achieved through the contribution of the flame ( torch ) through a burner fueled by propane gas . For a correct installation is essential to apply adequate pressure to the sheets.
The vertical joints are always made in total compliance . To avoid abnormal tension in the membrane is recommended that the angles between the horizontal plane and the vertical plane are connected with the formation of a " guscia " concrete or prefabricated circular or triangular cross-section and of a suitable material (wood , rock wool ) .
If you choose the pose without " guscia " connection , in addition to the requirements described is advisable to add an additional strip of siding to strengthen the area and create the conditions for greater malleability of the membranes forming the flap .
The share of vertical joints should be appropriate to the intended use of the cover and in any case will always provide a height greater than the finished surface of the flooring with variable heights depending on the surface finish , but in no case less than the minimum dimensions described on the code of practice. Up to this dimension between the other flap will always remain in the double layer , even in case of finishing monolayer coverage , and the completion in addition to these points may be continued with monolayer sheet .
In any case, the vertical joints should never be made directly with the towels from the floor with a solution of continuity up to the top of the same . The vertical must always be made separately from Lego , with portions of fabric cut transversely to the length of the towel with sections that can vary from 100 to 250 cm depending on the number of operators who will execute the detail .
As an additional mandatory requirement , must always be provided for plumbing work ( or appropriate housing wall ) to crown any type of finish vertical . Never the flap to seal must be delegated to the total adhesion of the membrane on the support , free of a finishing element .
In the embodiment of the gutters or terminations , the waterproof membrane will completely cover the gutter and the head of the waterproof sheet must be protected by a metal flashing . For the gutters , the impermeable membrane must be folded inside the upper part of the gutter anchored to the pitch of the roof , so as to favor the immediate outflow of rainwater.
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