T12 – trapezoidal profile

Preparation for roof installation:

Before the installation of the trapezoidal roofing, it is necessary to adjust the lathering span according to projects, which specify the distance and measurements of lathering. In case that we do not use gutter edging, it is necessary to eject the trapezoidal sheet approximately into the centre of gutter. Due to the condensation of air humidity during the spring and autumn months, it is necessary to use safety hydro insulation – under-roof foil. It is essential to use this foil at heat insulated truss. The safety hydro insulation is necessary to stretch to the gutter edging or directly to the channel of the gutter system. On the foil the cross laths lengthwise of the beams are nailed and then only the lathing. We install gutter hooks on the rafters to the required slope towards the gutters. The gutter hooks can also be installed on the front plate. We instal roof windows according to the installation instructions supplied by their manufacturer.

Before the installation of individual sheets, it is necessary to install the roof accessories as are for example: gutter edging, valleys, etc. We stretch the bands of trapezoid to the roof truss over the wooden laths, eventually over the cylinders. We start to install from the belt right bottom, which lower edge has to be parallel to the gutter. The construction is nailed only with screws. We further add the panels horizontally and vertically according to the laying plan. After checking the regularity of the first three pieces, we can fasten them to the construction. The metal sheet is screwed into the lower tie band that is in contact with roof lath. It is allowed to walk on the metal sheet only in the shoes with soft sole. It is allowed to walk only in wave’s valley places where are the laths placed. The protection foil must be removed from the product, respectively from the covering immediately after the installation. Finally, the wind strip is installed on the roofing and the ridge. After the installation, it is necessary to remove the metal chips and sawdust from the metal sheet surface with a soft brush.

Anchoring of the roof:

The trapezoidal sheet is fixed on the structure by self-drilling screws with sealing pad with special rubber EPDM with dimensions of 4.8 x 35 mm. The screws must be tightened by electric screwdriver with stepless power. The screw is securely tightened when EPDM pad “climbs” (comes out) from the metal pad. Average consumption of screws is 6-9 pieces per m2. We place the screws in the wave valley so that the roofing fits snugly to the roof lath. At the edge of the roof, the covering must be anchored denser. At the ridge of the roof, it has to be anchored to the bottom of each wave. On the joints sheet – sheet, self-tapping screws with dimensions of 4.8 x 20 mm are used.

Roof ventilation:

The quality of roof ventilation as a whole is very important. On the ridge, we leave a gap between covering with a width of about 11 cm, which we cover with a universal ventilation band. Roof is then ventilated through the openings between the ridge tile and roof. The ridge tiles are screwed into the roof every other upper wave. After anchoring the roof and ridge tiles we should install other accessories such as snow barriers, upper leeward bars, etc. During the assembly, it is necessary to remove the metal sawdust from the metal sheet surface with a soft brush.

We offer complete additional accessories for roof coverings, whether plumbing accessories made of metal sheet or roof accessories such as screws, foils, sealing elements and others. Of course, we also have various types of snow barriers in our portfolio.

More information about accessories can be found here.