How to make a crate under the metal tile - device and

Metal profiles are the most practical, affordable, popular roofing covering that is acquired and installed by millions of private and country house owners. The advantage of this material is that the technology of its installation allows you to do the work yourself, saving you on hiring a professional team. However, inexperienced craftsmen often have a question how to make a batten for metal tile, what is the right choice of board size and step between them so that the roof can withstand intense snow and wind loads. In this article we will tell about the device of crates under the metal, and how to build it yourself.

Device

Crate for metal tiles - the base on which the roofing is laid. It performs in the roof structure it performs 3 important functions: it provides stiffness to roofing ramps and evenly distributes the weight of the metal profile, transferring the load to the foundation. For the manufacture of the base for the roof, an edging board or moisture-resistant plywood is used, the size and thickness of which determines the calculation of the load. The crate for metal consists of 2 elements:

• Counterbribe. Kontrobreshetka is a wooden slats with a thickness of 2-5 cm, which is fixed along the rafter legs of the frame on top of waterproofing. This design element helps to fix the waterproofing film and forms a ventilation gap inside the "cake".
• Crate under the metal tile. When a counter lattice is mounted over the rafters, a crate for metal tile is mounted perpendicular to it. To make it, use edged sludge unedged board or OSB. The size and pitch of the sheathing under the metal tile is determined by a calculation that takes into account the weight of the roofing material, snow and wind loads.

Important! Contra-grille and lathing for metal tiles are important structural elements of the roof, on which its strength and carrying capacity depend. To determine the required size and pitch, you need to correctly carry out the calculation by summing the loads that the board is subjected to during operation.

Kinds

The sheathing under the metal tile is an obligatory structural element of the roof made of metal profile, which performs the function of supporting and distributing the load on the rafters. On this construction, for the manufacture of which an edging board or moisture-resistant plywood is used, a topcoat is laid. Correctly calculated step of the batten under the metal tile guarantees durability and high bearing capacity of the roof. Lathing for metal can be 2 types:

1. Solid. The solid lathing under the metal tile is a solid base, for the manufacture of which moisture-resistant plywood or edged board is used, laid without gaps. It is used if the roof is subjected to high loads, the roofing material is heavy or due to the small slope of the ramps. In this case, first a counter-grille is mounted on the rafters, and then solid flooring.
2. Sparse. Sparse crate for metal is a flooring for laying roofing, for the manufacture of which is used cut or unedged board, laid at a short distance from each other. To determine the size of the elements and the distance between the slats, it is necessary to correctly calculate the loads that lie on the ramp during operation.

Important! Kontrobreshetka and obreshetka for metal tiles are most often made of wood. To protect the wood from moisture, it is necessary to impregnate with antiseptic compounds. It is also recommended to process the boards from which the roof frame is made of fire-blocking substances.

Type selection criteria

Inexperienced craftsmen often wonder how to make a crate under the metal tile correctly. In order to answer it, you must carefully study the manufacturer's instructions, because the distance between its slats depends on the nature and wavelength of the metal profile. In order to properly mount the foundation for the flooring of the roofing material, you need to consider 2 factors:

• Bias The greater the slope, the greater the distance between the base elements. If it is flat, then the contra-lattice and trellised flooring on which the floor is laid are made of thicker and more durable materials.
• The weight of the material. Metal roof weighs only 3.5-4.5 kg / m2, so the dimensions of the boards for the manufacture of the base are calculated based on additional factors.
• Climatic conditions. If the area of ​​construction is characterized by a large amount of precipitation in winter, the size of the elements for the manufacture of the base is increased, and the distance between them is reduced.
• The nature of the wave profile. The distance between the slats should correspond to the metal profile wavelength in order to install the coating was convenient.

Experienced craftsmen advise to take into account the wavelength of the metal profile, performing the calculation of the step between the structural elements in order to simplify the process of fixing sheets of material. The high-quality framework will relieve from many problems at installation.

The influence of the slope angle

It is better to begin the installation of the lathing under the metal tile by performing a careful calculation of the permanent and temporary loads it is subjected to. In order for the construction to endure all natural disasters, it is better to put a small margin of safety in the calculations. Experienced masters recommend sticking to the following recommendations:

1. The crate for metal tiles on a low-slope roof should be solid. It is more rational to make it from sheets of moisture-resistant plywood.
2. The crate for metal tiles on the mid-aisle structure should be lattice. The step between the slats should be 10-15 cm, and the thickness of 4-5 cm.
3. The basis for the flooring of the metal profile, if the angle of inclination of the slopes is more than 35 degrees, may be sparse with a distance between the slats of 15-20 cm, and a thickness of 2-3 cm.

Note that the roof under the metal should be flat so that the material after installation "did not walk." Therefore, for the manufacture of the base, it is better to use the OSB or the cut-off edged board, aligned in thickness.

Even an inexperienced master can cope with the installation of a roof of profiled steel sheets provided that the roofing pie is properly organized. The main thing is to strictly follow the recommendations of the manufacturer and comply with the technology of work. Read more about the design of metal roofs, insulation, waterproofing, read other materials on the site.

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