If you decide to use metal tiles as a covering material, then you will need to carefully study the installation technology, and not only the roofing itself, but also the lathing system.
Features of the calculation
The pitch of the sheathing under the metal tile should be selected with an eye to some factors. Among them, it is possible to distinguish varieties of roofing, here it is important to pay attention to its profile. Be sure to take into account the step between the location of adjacent elements, which, as a rule, is indicated in the instructions by the material manufacturer. In order to determine this parameter, it is necessary to measure the distance from the bottom edge of the first board to the top edge of the second. The step of the lathing under the metal tile will also depend on the slope of the slope, as well as the width of the roof protrusion beyond the border of the starting bar of the system.
The master must decide before the start of work whether the structure will containdrain, as this affects the calculations. If the drain will be fixed to the frontal board, then 30 millimeters must be added to the ledge. Among other things, the gutter for the drain, or rather, its diameter, will play the role. Thus, if its value is equivalent to 90 millimeters, then the protrusion will be different from the case in which it is equal to 120 millimeters. The measurement of the parameters of the protrusion of the roofing material should be made from the frontal board, while the slope of the slope will depend on how much the metal tile sheet needs to be released. If you make a mistake, then it can adversely affect the determination of the correct location of the crate. With this position of the roof, the material will not coincide with the elements of the lathing system.
Determining the distance between elements
The step of the crate for the metal tile should be determined taking into account the presence of valleys, while measuring the parameters and fixing the crate should be from top to bottom, taking into account the length of the tail of the system. In some cases, due to the presence of a long tail, it is necessary to install an additional board of the crate system, which is necessary for rigid fixation of the ridge bar.
Mount Features
Before starting work, you should think about what step of the crate for the metal tile will be chosen. It is also important what materials will be used. Thus, for rafters, a beam should be used, the cross section of which is 150 x 150 millimeters,which is the minimum indicator, but for the crate, a beam of 25 x 100 millimeters should be used. It is important to install not only the crate, but also the counter-crate, for which you need to use a board with a section of 25 x 50 millimeters. The distance between the rafters should vary from 600 to 900 millimeters. The first plank should be placed in a straight line along the eaves, while not allowing it to be reinforced with a ledge.
Expert advice
The step of the crate for the metal tile should be chosen in such a way that the distance from the board protruding beyond the eaves to the next element is 50 millimeters less than the rest, that is, this parameter should be equal to 300 or 400 millimeters. The distance between the following components of the crate should be equal to the step between the nearest upper points of the profile, that is, 350 and 450 millimeters. The step between the boards of the crate should be equivalent to 350 millimeters, the exception to this rule is the first and second boards. It is necessary to analyze how correctly the distance between the first elements is determined on the ground. To do this, two blanks must be placed parallel to each other at a certain distance, you can bait them on the crate itself. Then a sheet of tiles is applied to them, which will determine the most appropriate length of the ledge of the roofing.
Possible errors
IfIf the step of the lathing was determined incorrectly, and the protrusion turned out to be too long, then this will lead to the fact that the water will overflow over the edge of the gutter, while with a short protrusion, water will flow between the gutter and the frontal board. With a long protrusion, the sheet may deform under the weight of snow. To carry out the markup, you should use a tape measure. After that, it is necessary to fix the end and ridge strips. The wind bar should be located above the crate. In order to make it easier to strengthen the ridge, additional boards measuring 25 x 100 millimeters should be fixed in the right place.
Summing up
As you know, the most difficult thing is to determine the distance between the elements of the frame system. What should be the step of the crate under the metal tile, you must know, because otherwise the roof system will not be reliable. For the reason that it is recommended to fix a sheet of roofing material in the lowest part of its wave, the distance between the components of the crate must be chosen depending on the pitch of the material profile. The optimal and standard dimensions of the transverse wave of metal tiles are 300 and 450 millimeters. When calculating the distance between the boards of the crate, you should focus on this indicator.
Features of lathing
The step of the lathing under the metal tile "Monterrey" will be the same as for the traditional material. Before carrying out work, it is necessary to measure the distance betweenrafters. Thus, the length of the board or bar that will form the basis of the crate will be equal to an indicator that is a multiple of the distance between the rafters. It is necessary to choose wood for the system so that it is well dried in natural conditions, and also thoroughly impregnated with an antiseptic. Additionally, the elements can be independently treated with flame retardants. Depending on the configuration of the system, a board 24 x 100 millimeters should be used as the material for the sheathing with a roof slope of 15 to 60 degrees. The step between the rafters in this case should be equal to 1200 mm. A board of 36 x 100 millimeters must be used if the distance between the rafters exceeds 1200 millimeters. This is also true for the case when a metal tile is used, the thickness of which is 1.5 millimeters.
When the step of the lathing for the "Grand Line" metal tile (or any other) is determined, you can start purchasing materials. Thus, if the roof has a non-standard configuration, then bars of 40 x 60 millimeters should be used. In this case, the rafters will be laid with a significant step. The crate can also be solid, while chipboard or plywood is used. This material is combined with a crate made of a bar. This statement is true for complex roof areas, for example, junction areas, cornices, ridge or valleys. The calculation of the step of the crate for the metal tile is carried out according to the same technology, if it is supposed to use a metal profile, whichable to replace wooden elements. This solution justifies itself when there is a need to achieve high fire properties of the roofing system.
Determining the amount of material
If you will strengthen the crate under the metal tile, we take the right step, this is very important. But it is also necessary to calculate the amount of materials. To do this, the number of rows in the lattice must be multiplied by the number of boards in the row, and then by two more. In the end, you will receive the right amount of lumber, which should be purchased to complete the crate. Due to the fact that lumber is sold, as a rule, in volumes, the number of boards must be converted to cubic meters. To do this, the geometric dimensions, which are expressed in meters, must be multiplied, and then multiplied by the number of boards determined by the calculation. It is preferable to purchase the material with a certain margin, which will be necessary if some elements turn out to be defective. If we are talking about a roof of complex configuration, then the calculation should be carried out for each section of the system separately.
In closing
You can determine the crate step yourself by reading the article, but this is only a small part of success. It will also be important to correctly carry out the installation work, following the technology. Only in this way the calculations will be justified, and the whole system will be distinguished by strength and durability, as well as an attractive appearance.
