Step of rafters for corrugated board

Knowing the procedures for installing corrugated board rafters is crucial to roofing because it guarantees a strong, weather-resistant building. The integrity of the roofing system as a whole depends on the correct installation of rafters, which provide the structure for the roof.

The angled beams that extend from the roof’s ridge or peak to the eaves are called rafters. Whether the roof covering is made of shingles, tiles, or in this case, corrugated board, they offer the structural support for it. To evenly distribute the weight of the roof covering and any external loads, like wind or snow, each rafter is positioned across the span of the roof.

Thorough planning and measurement are required prior to starting the rafter installation process. This involves figuring out the roof’s pitch or slope, which influences how sharply the rafters will incline. Local building codes and the anticipated load are two more factors that go into calculating the rafter spacing calculation.

After planning is finished, the ridge board must be cut to the proper location and then installed as rafters for corrugated board. This horizontal beam connects the tops of the rafters and offers extra support as it runs the length of the roof. It helps to evenly distribute weight throughout the structure and acts as an essential anchor point for the rafters.

Installing the rafters themselves comes after fastening the ridge board into place. Typically, rafter sizes and shapes are determined by the unique design and dimensions of the roof. After that, they are carefully positioned and fastened to the building’s walls at the bottom and the ridge board at the top.

Making sure the rafters are appropriately braced is a crucial next step after they are all in place. In order to stabilize the rafters against lateral forces like strong winds, bracing is helpful. To reinforce the entire roofing structure, diagonal braces are typically used to join the rafters to the building’s walls.

Step 1: Measure and Mark	Start by measuring and marking the positions where the rafters will be installed on the structure.
Step 2: Install Ridge Beam	Place and secure the ridge beam at the peak of the roof to support the tops of the rafters.

Knowing the procedures for assembling the rafters is essential when constructing a corrugated board roof. The rafter system is the fundamental component of the roof structure, offering the corrugated sheets stability and support. Rafferty placement and alignment guarantee that the roof can sustain weather and disperse weight uniformly. This post provides crucial guidance on how to properly position rafters so that the corrugated boards are supported by them at the proper spacing. Comprehending these procedures facilitates the construction of a sturdy and dependable roof that can tolerate diverse weather circumstances.

The distance between the rafters under the metal tile and the corrugated board

Like all other structural elements, the rafter system of the roof should be designed during the house’s design phase using specific guidelines and techniques. All of the rafter frame’s parameters, including the number of rafters and the separation between their longitudinal axes, can only be precisely calculated using load data. The rafter system will end up being either unduly large and costly or insufficiently sturdy and dependable if the builder disregards the computation and chooses to install the rafters "by eye." In the latter scenario, the rafter frame will unavoidably deform or completely collapse.

General procedure for calculating a step of rafters

1. We set the approximate step of the rafters, which can be selected from the range from 600 to 1200 mm. When doing this, the width of the rolling rolls and waterproofing rolls should be taken into account, as well as the selected roofing material (what step should be set during the installation of corrugated board or metal tiles, we will tell you below).
2. The length of the slope (according to the cornice) we divide the rafters step, which we chose in the previous paragraph, rounding the resulting value to the whole number (in the larger direction).
3. To the calculated one -described method, we add a unit, thus receiving the number of rafters on one slope.
4. We divide the length of the slope into the number of rafter legs, determined in p. 3. As a result, we get the updated step value with which the rafters will be installed.

A simplified computation table for corrugated board and metal roofs

How to take into account the type of roofing material when calculating a step of rafters?

The approximate step of the rafters in p. 1 of the above calculation methodology should be chosen from the range recommended by the manufacturer if materials like corrugated or metal tiles are chosen as the roof covering. The following points will outline its limits for each of these roofing materials:

A) the distance between the rafters of the roof under the corrugated board

In the instructions for the installation of most popular brands of corrugated board, a value of 600 mm is indicated as a minimum stepal step, the maximum permissible step does not exceed 900 mm. When installing the rafters with a large, as indicated, with a step, the entire rafter system will have to be strengthened by powerful boards mounted in the transverse direction. Root legs are made of a beam, the width of which is 50 mm and the height is 100 or 150 mm. The material for the crate is a board with a section of 30×100 mm. The step of its laying is determined by the thickness and height of the trapezoid of the corrugated board, and its minimum value is 500 mm. The first board of the crate, lying at the level of the cornice, should be thicker than the next 10 – 15 mm. The design and parameters of the crate should provide the possibility of installing the chimney, ventilation ducts, attic lights and other elements.

B) the distance between the rafters of the roof under the metal tile

Today, metal tiles are the most popular roofing material in individual construction. Outwardly, it looks like a classic clay tile, but differs from it with a smaller weight, which allows you to use a less bulky rafter system. The recommended step of the rafters when the installation of a metal -based roof lies in the range from 600 to 950 mm. The width and height of the cross -section of the rafter leg are equal to 50 and 150 mm, respectively. It is not recommended to make rafters from bars with a smaller cross -section, since the installation technology of a metal roof provides for drilling holes in the upper part of the rafters with a diameter of 10 to 12 mm in order to ventilation of the subcutaneous space.

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You can equip your roof with a high-quality, functional roof by using corrugated board. The corrugated board crate must be properly measured and installed in order to guarantee the coating’s dependability and longevity.

Features of the profiled sheet

Corrugated board is a fairly light and strong roofing material made of steel sheet. The stiffness of the profiled sheet depends on the thickness of the metal, as well as on the depth and configuration of the profile, the width of the corrugation. The step of the crate on which this material is attached directly depends on the characteristics of the specific brand of corrugated board, the angle of inclination of the roof, the alleged operational loads. The larger the profile height, the higher the maximum load that the profile is able to withstand. The device of the crate for corrugated board requires the use of wooden beams or boards laid close or gathering perpendicular to the rafters. This design provides the necessary strength of the roof, its resistance and uniform distribution of external loads. It is mounted during the construction of rafter systems made of wood or metal, as well as on roofs with a small slope made of reinforced concrete plates. Installation of a wooden crate for corrugated board is performed using brackets, nails, self-tapping screws, dowel-grooves, depending on the material of the rafter frame or the base of the roof.

Principles of calculating the crate for corrugated board

• with a minimum slope of the roof for the installation of corrugated board, a continuous crate is required, or a crate with a step that does not exceed 400 mm (the choice depends on the thickness of the metal and the brand of the material used);
• With an average bias, a wooden base can be mounted with a step of 300 – 650 mm;
• If the roof has a large slope angle, the step can be up to 1000 mm;
• Separate brands of corrugated board with high stiffness can be mounted with a crate step up to 3,000 or 4000 mm if the slope angle is more than 8 degrees.

You can get more acquainted with the table below, which illustrates how the step of the crate depends on the profile brand:

Angle of roof tilt and hail

Table: The relationship between the corrugated board brand and the crate’s step

The material of the finish coating should be chosen in advance when designing a roofing system. In the accompanying documentation, corrugated board manufacturers specify the conditions for laying a particular material. Completing the corrugated board crate calculation according to the manufacturer’s specifications is advised (these specifications do not exceed SNiP requirements).

Corrugated board with a 35 mm high profile is frequently selected in private construction from steel sheets that have a thickness of 0.6–0.7 mm. The roof is intended to support a load of up to 600 kg per square meter, but such material can be installed on a collapse in steps as small as 1.5 meters. You can terribly move around on such a roof when cleaning or doing repairs, but be aware that this highly durable structure costs a little bit more than a roof made of less rigid corrugated board.

If corrugated board with a profile height of 21 mm or less is to be used, the corrugated board crate’s step should be as small as possible, or a continuous collapse should be installed. Because this roofing material is not meant to support heavy loads, it needs a sturdy foundation to prevent sheet deformation.

Since this material is intended to arrange the roofs of industrial structures, profiled sheet with a profile height of 44 mm is essentially never used in private construction.

Preparation of material for the crate

You must compute the step and determine the length and width of the slope in order to determine how much lumber is needed. It should be mentioned that in order to guarantee the required strength of the roof flooring, the skate and cornice should be mounted on two boards. The positions of the ventilation boxes, stove pipes, auditory windows, etc., are also necessary for strengthening. The computation result should be increased by an additional 10%. because the part will be wasted during the installation process when the pillarium needs to be cut to the proper size.

The minimum size of the bar’s cross section should be 50 × 50 mm. A 50 mm-thick board that has been trimmed or left uncut can also be used to construct the crate. The use of well-dried lumber is necessary. It is advised to use boards and bars made of alder, beech, pine, and spruce. Even though the material might not be fugged, you should still be aware of how straight its surfaces are.

Crumpled boards and beams should not be used; instead, the elements’ surfaces should be adjusted as needed.

Since the corrugated board crate is used in an environment with high humidity, there is a significant chance that fungi and microorganisms will damage any wooden components. Lumber must be treated with antiseptics in order to keep wood from rotting. Roof element fire processing is also required. These days, unique compounds that provide fireproof protection are made, enabling simultaneous processing of the two kinds.

Although the completed crate may be processed, the roof’s design will be much more effectively protected from the elements if it is mounted beforehand using a composition that has been qualitatively impregnated with fire resistance.

Installation of the crate

Ways to construct a crate beneath a corrugated board? If corrugated board is being used as a finish coating, you should first take note of the pitched roof’s roof pie structure. It is necessary to install waterproofing, such as a special waterproof membrane or roofing material, on top of the rafters. High-quality ventilation is necessary for the profiled sheet roof, so in addition to waterproofing, fill the bars along the rafters with a cross section of 50 × 50 mm. This allows for the creation of the necessary ventilation gap.

The counter has the crate fastened to it. Boards or bars are filled in this way, strictly horizontally, parallel to the cornice. It is advised to pull the rope by fastening the slope’s edges in order to make the installation simpler. Since the slope is horizontal, it is preferable to use a wooden template. The crate is secured to the wooden bars using brackets or nails; self-tapping screws should be used if metal components are used. Dowels are used to secure it to the roof’s concrete base.

The main board of the crate is attached at the bottom of the slope, parallel to the cornice; it should be thicker than the other components. The height of the profile of the profiled sheet and the length of the fastener used to secure the outer side of the roofing sheet determine the thickness of the board. Wind boards must be installed at the ends of the roof slope. Their surface should be at least as tall as the corrugated board profile, higher than the other components of the crate.

The crate is subsequently installed beneath the corrugated board, working upwards from the bottom. Every raft has a single nail holding each bar in place. In order to prevent the board from turning and damaging the roofing when heavy loads are applied, two nails on the upper and lower edges of each rafter should be used to secure the board. Determine how long the crate’s components should be on the rafters and fasten each end with brackets or nails. You shouldn’t join the crate of adjacent tiers on a single rafter leg.

A specially produced video will show you how to build a corrugated board crate while observing the installation technology.

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Step of rafters for corrugated board

Of course, the foundation is provided by the building’s strength and dependability. The windows give the house a vibrant color, and the facade’s design defines its beauty. When the building’s roof frame is not calculated correctly, the flooring sags and allows snow, rain, and wind to enter the building, losing its strength, beauty, and functionality as well as its safety. The most resilient material will become less good if the new building’s roof’s skeleton is assembled incorrectly. The accurate computation of the load of corrugated board on the roof’s rafter system is what makes the difference.

The roofing will last for many years on the rafters placed with the proper step, or an intermediate distance, without needing to be replaced.

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General principle of calculation calculation calculations

A system of wooden rafter supports, which functions as a frame for coating installation from profiled sheet, forms the basis of the roof’s design. Precisely measuring the distance between the rods must be done to prevent coating sagging and corrugated board deformation, which would require an unexpected replacement. The type of polymer coating and the thickness of the metal that serves as the foundation of the material determine the step of rafters for corrugated board.

The spacing between the beams’ "legs" decreases with increasing roofing material mass.

To calculate the distance, find the length of the roof slope that corresponds to the length of the cornice. Additional mathematical operations are carried out in accordance with the algorithm:

1. The length of the roof slope is divided into a size equal to the distance between the rim of the frame.
   (for example: slope length ─ 30 m, size between rods ─ 0.7 m. thirty. 0.7 = 42.8);
2. Add 1 (42.8 1 = 43.8) to the resulting value;
3. Round the number to larger (43.8 is rounded to 44);
4. To determine the exact value of the distance between the beams, the length of the slope is divided by the resulting number (30. 44 = 0.68). Rods will be installed at a distance of 0.68 m.

Roof cladding profiled steel

The weight of the roofing corrugated board, which has a higher corrugation profile than the wall, varies within the boundaries of 5-8 kg, is determined by the thickness of the metal used, the type of colored galvanized coating, performed by a single-layer or in several stages. The installation of rods is determined by a distance of 0.6-0.9 meters. With a larger value, it is necessary to equip the crossbars that preserve the roof from the bending, deformation of the coating. The cornice board is installed on fifteen to twenty centimeters thicker, enhancing the edge of the roof. Rafters are assigned the supporting role of the structure of the structure. The height of the profile determines the diameter of the guides used. The limit of the load on the skeleton is set, taking into account the height of the wave of corrugated board, bearing the ability of the material. Production documents accompanying the selected roofing corrugated board contain the recommendations of permissible loads, determining the force of the effect of the coating on the square meter of the flooring. Current maintenance, possible repair of the erected roof involves moving along the slope of the roof. The reliability function lies on the installed rafters. The distance of the step is responsible for the safety of work, preventing sagging, surface deformation.

For those who want to do roofing projects on their own, knowing how to install rafters for corrugated roofing is essential. The entire roof structure is supported and stabilized by the rafter framework, which is used to attach the roofing material.

First things first, make sure you have the right supplies and equipment: rafters, corrugated boards, saws, measuring tapes, nails, or screws. To start, mark and measure the locations of each rafter along the edges of the roof. These marks act as a guide to ensure that the rafters are positioned evenly.

After that, trim the rafters to the proper lengths, making sure they nestle tightly between the eaves and the ridge of the roof. After positioning each rafter, fasten them for the time being with clamps or braces. Prior to permanent fixing, this step guarantees that all rafters are correctly aligned.

After aligning them, fasten the rafters with nails or screws to the roof frame, making sure that each rafter is firmly fastened to the wall plates or beams at the bottom as well as the ridge beam at the top. In order to prevent the roof from shifting or sagging over time, this step is essential to its structural integrity.

Once the rafters are fastened, measure and cut the corrugated roofing sheets precisely to match the size of your roof. To stop leaks, make sure that every sheet overlaps the one before it by a small amount. Use the proper fasteners to attach the corrugated boards to the rafters. For example, use screws with rubber washers to prevent water infiltration.

Finally, look over the entire roof assembly to make sure there are no gaps or loose parts. Verify that all fastenings are tight and make any necessary adjustments. In addition to improving the visual appeal of your house, properly installed rafters and corrugated roofing offer dependable weather protection for many years to come.

Video on the topic

Contact and crate under corrugated board