How the Tents of Double Structure

How they work fabrics of the modern carp against cold, heat and humidity. How are the new stores from a single wall.

The use of tents as a recreational element was born with the development of activities outdoors in general, an antidote to counter the effects of the alienating urban life. This philosophy outdoor boom arrived in the decades of the 60s and 70s of the 20th century, with the first type of tent that became an icon of campsite, the Canadian. It had rigid Struts and applied the concept of construction with double structure (inner body and rainfly) to solve the problem of internal condensation. Called them Canadians because, in principle, they were used by the military of Canada. Later they arrived and the CARP called conmunmente became very popular igloo or dome. Keeping the body double construction, they are self-supporting, much better resist the wind, have no obstacles in its interior (such as the Canadian rigid studs), are much lighter and occupy less volume after disassembled.

Great solutions

The main problem of a tent is that insulation against outside moisture retention and internal moisture. The solution was the concept and the construction of so-called “tents of double structure”. Even at rest, the human body expels about 140 grams of water vapour per hour, that accumulates on the inside of the tent without adequate ventilation. Condensation is greater with bad weather, because the cold or the rain reduced the temperature of the outer surface of the tent, and the steam is condensed more quickly when it comes into contact with the inside wall.

The solution is the design of tents with a double structure. The inner body is made of a breathable fabric, a fine enough plot and a resistance to water treatment. The moisture-laden air will easily pass through this fabric, but it will be retained by the second structure: a waterproof fabric commonly called rainfly or dobletecho. Condensation will form on the inside of the dobletecho to then slide down, dripping on the floor of the outer perimeter of the tent.

High-end designs seeks effective ventilation to reduce condensation. The fly will then have windows with eave (to protect them from the rain), or small sleeves and apses or lobbies that allow the opening of the doors to the inner structure to fresh air without that penetrate the water or, eventually, snow. With the current technology in technical fabrics appeared other types of constructions of tents. For example, using tissues impermeables-respirables type Gore-Tex emerged tents called “single wall tent” (single-walled tent). They are much more expensive and its use applies only to models of mountain expeditions, where it is essential to reduce weight, volume and time of Assembly of the tent. A second option of construction in single wall tents are those using bodies manufactured in tissues composed of Dyneema, a sophisticated technology, which comes from the aerospace industry and sailing high. But they are also expensive and (for now) use more technical, less massive.

Important considerations

> Weather or seasonal conditions. It is said that a tent should be the quality of protecting us from the Sun; in summer in spring, the ability to isolate us from the rain; in autumn, you have to resist the wind and protect us and during the winter, offer us a good shelter against the cold. So a tent may be, in accordance with its construction and materials, 1, 2, 3 or 4 stations. The most versatile and used for trekking, hiking biking, camping in general, or even in regions of hills or mountains (although not in the high mountains) are the 3 stations. They are very similar to the 4 seasons, since they have greater thermal protection and better ventilation (because internal condensation is greater in the cold). Their wind resistance will be determined by the double roofing material, as well as the quality and quantity of studs, stakes and tensioning winds.

> Capacity. The most current designs in trekking and mountaineering tents are designed so that they occupy it between 2 and 4 people side-by-side. Between tents, which at first sight are the same, there may be enough difference in the usable internal volume, and we have to look at the drawing of the plant (quadrangular, pentagonal, hexagonal, etc,), interior maximum height and the angle of the walls (the more upright, more usable space).

> Flexible studs. Its amount varies according to the use and design of the tent, but all are composed of several sections of tubular fiberglass rods, alloys of aluminium, and even carbon fiber. Aluminium is the most widely used in tents of good quality, and there are very light and resistant alloys as the Easton 7079-T9, also carrying a treatment of anodized making it 10 times less susceptible to corrosion than other alloys as the 7001. The latest novelty are the inflatable studs, introduced on some models of tents.

> Stakes. Although good tents for 3 or 4 seasons often bring quality games, it is always possible to tune them with aluminum coating, ceramic, titanium or carbon or aluminium profiles, very strong and lightweight. There are also special for wobbly land; they are armed for sand or snow special anchors, and until there are stakes strong and LED lighting for the night. Other interesting accessories are the winds of Paracord (light and heavy duty nylon originally used in parachutes) reflective, or which glows in the dark.