Installing a trunk on the roof of the car is only the first step to organizing a full-fledged space for the transportation of goods. However, a key element ensuring the safety of things and traffic safety is a high-quality screed for the trunk on the roof of the car. It depends on the reliability of the fixation whether your bike, skis or bulky cargo will reach the destination in one piece.
Many motorists underestimate the importance of choosing the right belts, relying on standard complete solutions that often prove to be not strong enough. Wind loads, body vibration and inertia during braking create enormous pressure on the fastening system. Cargo belts must withstand multiple excess weight of the transported object to eliminate any risks in transit.
In this article, we will analyze in detail the types of screeds, their design features and operating rules. You will learn how to correctly calculate the required length and load, and avoid common mistakes when packing luggage. Safety on the road begins with the proper preparation of the vehicle.
Key parameters of the selection of tie belts
When selecting fixing elements, their load capacity is of paramount importance, which is indicated by the marking Lc (Working Load Limit). This parameter indicates the maximum permissible load that can be carried. polyester or nylon without deformation. For passenger cars, belts with a load of 250 to 500 kg per tear are usually sufficient, but you should always take a safety margin of at least 30-40%.
The second critical aspect is the material of the tape. The most common and reliable option is polyester tape, which is practically not stretched under load and is resistant to ultraviolet light. Unlike nylon, which can be pulled when wet, polyester It retains its geometric dimensions in any weather, which guarantees the immobility of the cargo.
It is also necessary to pay attention to the fittings, in particular, to the ratchet mechanism or buckle. Metal elements must be protected from corrosion, as constant contact with precipitation quickly disables cheap alloys. Quality steel-buckle Anti-corrosion coating will last much longer.
⚠️ Warning: Never use household ropes or cords to fix heavy loads on the roof. They do not have certificates of strength and can burst from a sharp jerk when braking.
Types of fastening mechanisms and their features
The modern market offers several options for fixation mechanisms, each of which has its own advantages. The most popular are belts with a ratchet mechanism (ratchet), which allows you to create a huge tension with the efforts of one hand. These systems are ideal for transportation. construction heavy boxes where rigid fixation is required.
For transportation of delicate objects or sports equipment, straps with a friction buckle (cam buckle) are often used. They do not allow you to pull the load, which is especially important when fastening plastic boxes or skis, which can be damaged by excessive pressure. Friction castle It provides fast and convenient fixation without the risk of damage to the surface.
Separately, it is worth mentioning elastic screeds with hooks, which are only suitable for light cargo, such as empty canisters or soft bags. Their use for heavy objects is unacceptable due to the high probability of slipping the hook under the influence of vibration. Reliability hook-joint It is always lower than the closed circuit of the belt.
- 🔒 Snoring mechanism - provides maximum tension, ideal for heavy and monolithic loads.
- 🛡️ friction buckle - gentle fixation, prevents damage to sensitive surfaces.
- 🪝 Elastic cords - Suitable only for light, oversized items with a low profile.
When buying hook straps, make sure they have protective plastic linings. This will prevent scratches and chips of paint on the car body in the places of contact.
Rules for safe stowage and fixation of cargo
The process of fastening the cargo begins with the correct stacking on the crossbars of the trunk. Heavy objects should be placed strictly in the center of the roof, evenly spreading the weight between the right and left sides. Shifting the center of gravity can lead to a dangerous roll of the car when cornering, so loading-symmetry It is a prerequisite.
When stretching belts through the trunk, make sure that they do not twist and do not touch the sharp edges of the cargo. If contact with sharp angles is inevitable, it is necessary to use special protective corners or gaskets made of dense fabric. Friction of the ribbon Metal or plastic with strong vibration is able to cut even the most durable strap in a few kilometers.
Tension should be made in stages, checking the stability of the load after each turn. After the final fixation, be sure to check the belts after 10-15 kilometers of movement, as the new material may stretch out a little. Re-tightening tensioner ensures that the goods remain in place until the end of the trip.
☑️ Pre-departure checks
Comparative table of belt materials
The choice of tape material directly affects the durability of the screed and its behavior in various climatic conditions. Polypropylene options are cheaper, but wear out faster and are afraid of ultraviolet light. For regular use on the roof of the car, experts recommend investing in more expensive but reliable options.
Below is a comparative description of the main materials used in the production of tie belts. It will help you make an informed choice depending on the frequency of operation and the type of cargo transported.
| Parameter | polyester | nylon | Polypropylene |
|---|---|---|---|
| Stretch under load | Minimum (<3%) | Average (up to 8%) | High (up to 10%) |
| Resistance to UV radiation | Tall. | Medium | Low. |
| Moisture absorption | It's practically non-absorbent. | Soaks up to 8% of your weight. | Not absorbing. |
| Threatness | Very high. | Tall. | Medium |
Why is polyester better for the roof?
Polyester practically does not absorb moisture and does not stretch when wet, unlike nylon. This means that after rain, the tension of the belts will not ease and the load will not start to dangle on the roof, which is critical for safety.
Common errors in operation
One of the most common mistakes is to use too long straps, the ends of which hang freely from the roof. At high speed, such tails begin to slap heavily on the body, damaging the paintwork, or can wind on the elements of the chassis. Excess length It is necessary to twist into a tourniquet and fix with a rubber band or special clips.
Another common problem is mounting belts directly to the plastic elements of the roof or decorative moldings. Plastic can not withstand point pressure and bursts, which leads to the loss of cargo. The mounting points should only be on metal-arcs luggage or specially provided reinforced areas.
Also, drivers often forget that belts have a limited resource. Regular loads, sunlight and temperature changes gradually destroy the structure of the fibers. Visual examination for scuffs, tears and fading should be a mandatory procedure before each season.
⚠️ Warning: If visible tears of threads appear on the belt or the mechanism is consuming, it must be replaced immediately. The operation of the damaged screed can lead to an emergency situation on the track.
Regular replacement of worn belts is much cheaper than repairing a car or compensating for damage caused by a fallen load.
Care and storage of timber
To extend the service life of belts, it is necessary to properly care for them in between trips. After use, especially in rainy or snowy weather, the tapes should be dried before cleaning. Storage of wet polyester in rolled-up form can lead to mold and rotting of internal fibers, which imperceptibly reduces the strength-plate.
Tension mechanisms require periodic lubrication of moving parts. It is enough to drop a few drops of engine oil or special lubricant into the hinges of the ratchet so that it works smoothly and does not get stuck at the most inopportune moment. Frozen in winter mechanism can cause the inability to quickly remove the load.
The best place to store is a dry garage or wardrobe in the house, away from direct sunlight. Ultraviolet is the main enemy of synthetic materials, making them brittle over time. Proper storage fittings ensures that the next time it will perform its function without fail.
- ☀️ Sun protection Keep your belts in a dark place to avoid burnout and destruction of the fabric structure.
- 💧 Complete drying Never remove wet belts in the case, this will lead to the formation of fungus.
- 🛢️ Lubrication of the mechanism Treat metal moving parts once a season to prevent corrosion.
Frequently Asked Questions (FAQ)
How long should the trunk belts on the roof be?
The optimal length depends on the width of your vehicle and the height of the load. For standard passenger cars, belts 4-5 meters long are usually enough. This allows you to throw the belt twice over the roof and securely fix the ends. For SUVs and minivans, it is better to choose options with a length of 6-8 meters.
Can you use regular household ropes instead of special ties?
It's not recommended. Economic ropes do not have certificates of strength, are strongly stretched under load and do not have reliable fixing mechanisms. In case of emergency braking, such fixation may not withstand the inertia of the cargo, which will lead to an accident.
How often should I change my belts?
The service life depends on the intensity of operation. With regular use (every week), belts are recommended to be changed every 2-3 years. If you carry cargo rarely, then you need to change them when the first signs of wear appear: scuffling, ragging of the edges or corrosion of the mechanism.
What to do if the belt is twisted under load?
You can not leave the twisted belt under load, since a critical tension of the fibers occurs at the place of twisting. It is necessary to completely relax the tension, straighten the tape and stretch again. Ignoring this rule can cause the belt to rupture on the track.
Properly selected and installed screed is a guarantee that your cargo will reach its destination, and you will safely return home.