A run in construction is a way to strengthen a structure with minimal time and money. I will talk about the types of products used to strengthen roofing systems. Based on my recommendations, you will be able to choose the best solution for your home.
Types of structures
Let's figure out what a run is. In construction, these elements play the role of stiffeners, preventing the rafters from bending and increasing the strength of the structure. Longitudinal supports are required in roofs of great length and with a large mass.
If you look at the explanatory dictionary, then there the run is defined as a support beam in structures. That is, it can be used both on roofs and in the construction of partitions.
It can be of three types:
- Concrete;
- Metal;
- Wood.
Let's analyze each of the options separately.
Type 1: concrete products
They are made of concrete and reinforced with a reinforced concrete frame. The following types of products can be distinguished:
| Illustration | Description |
 | Rectangular Purlin. It has a square or rectangular section. There may be notches along the edges to simplify the installation process. The main parameters are:
Depending on the size, the weight also varies, it can range from 150 kg to one and a half tons. |
 | Run with shelf. This option has a special ledge on which other structural elements can rest. Installation of such supports is more convenient, but they are only suitable where an emphasis is needed on one side only. |
 | Tee purlin. The most popular option due to its high strength and ease of installation. This option is well suited for the load-bearing structures of partitions and reinforced concrete roofs in hangars. |
Such elements are rarely used in private construction due to the fact that installation requires the presence of lifting equipment. But the price of this option is low.
Type 2: metal products
This type of product has the following advantages:
- High strength. Steel is much more reliable than concrete and wood, so it can be used to strengthen the structure very effectively. It is important that the surface is covered with an anti-corrosion compound, otherwise the strength may decrease over time;
- small mass. If we compare the ratio of weight and reliability, then this option outperforms any analogue. Therefore, such structures are very well suited where it is important to limit the load on the structure and at the same time ensure strength;
- Ease of installation. Eyelets are made in metal elements or holes are drilled through which it is very easy to fix them on any surfaces. The main thing is to choose a reliable fastener.
Runs can be made independently if you have the necessary materials and a welding machine to connect the elements.
A metal run can be of the following types:
| Illustration | Description |
 | solid run. The most durable and reliable option for which a channel or I-beam is used. You just need to cut the elements into pieces of the required size and coat them with an anti-corrosion coating. Then holes are drilled in the right places and installation can be carried out. Metal beams are the most durable option. |
 | Bent elements. This type of product is made from a galvanized profile by bending on special machines. The resulting profile is universal, it can be used both as a run and as a crossbar. Its main advantage is its low weight, thanks to which the elements can be mounted with your own hands.
Both fastening elements and connectors (shown in the photo) are made, they further simplify the workflow. |
 | Lattice run. This option is welded from a profile pipe or corner. Jumpers and braces are placed between the upper and lower crossbars, giving reliability to the structure. With a small weight, a very strong knot is obtained, which can have a length of 10 meters or more. |
Metal products can also be used in wooden structures.They are convenient because with the help of corners you can quickly fix wooden rafters on them.
Type 3: wooden products
The most common option due to the following advantages:
- Availability. For use as supports, a beam or board is suitable, which can be bought at all hardware stores. The main thing is to select elements of the desired section in order to ensure the necessary reliability;
- Ease of installation. The elements are fixed with self-tapping screws, special screws, threaded studs or special brackets. There are no special requirements for the type of fasteners, the main thing is to provide a reliable connection that can withstand high wind loads and the weight of the structure;
- Choice of options. If the concrete run has clear parameters, then the wooden one is selected according to the situation. You can use as a single element, or fasten several boards or bars.
Installation instructions are simple:
- The side run is easiest to fix with corners. Wooden beams can be used as a support, or a crossbar can be fixed between the rafters, which will fix the element;
- The ridge support is attached between the rafters. For these purposes, you can use a board 50 mm thick or timber. To strengthen the ridge between the rafters, boards are additionally nailed on both sides as shown in the photo below;
- If curved glued structures are used, then the longitudinal supports serve as a load-bearing part of the roof. They are attached from the top side, and the roofing is laid on them.
Conclusion
You have learned what types of run are, and you can easily choose the best option for your roof. The video in this article will help you understand the topic even better, if you have any questions, ask them in the comments.
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