Tents

Parts of a modern tent

There are three basic configurations of tents, each of which may appear with many variations: Single skin (USA: single wall): Only one waterproof layer of fabric is used, comprising at least roof and walls. To minimize condensation on the inside of the tent, some expedition tents use waterproof/breathable fabrics. Single skin with flysheet: A waterproof flysheet or rain fly is suspended over and clear of the roof of the tent; it often overlaps the tent roof slightly, but does not extend down the sides or ends of the tent. Double skin (USA: double wall): The outer tent is a waterproof layer which extends down to the ground all round. One or more 'inner tents' provide sleeping areas. The outer tent may be just a little larger than the inner tent, or it may be a lot larger and provide a covered living area separate from the sleeping area(s). An inner tent need not be waterproof. The double layer may provide some insulation. Components of a tent: * A flysheet or rain fly (found only in double skin tents) is used to protect the inside of the tent from water. It is waterproof on the outside and also provides a surface to collect condensation on the inside. Condensation then runs down the walls to the ground. When a flysheet is used, it is important that there be no contact with the inner tent it is protecting; this keeps the inner dry. 'Expedition' tents often have extra poles to help ensure that wind does not blow the two layers into contact. * The inner tent comprises the main body of the tent. For double skin tents, the inner tent (often mesh) is not waterproof since it is protected by the rain fly. For single skin tents, the inner tent is often made of waterproof-breathable material that prevents liquid water from penetrating the inside of the tent, but still allows water vapour to be transported out. * The vestibule is a floorless covered section located outside a tent entrance that is typically used for the storage of boots, packs, and other small equipment. They are often used for activities that cannot be performed within the tent itself, such as cooking or equipment cleaning. Vestibules may be included as a removable attachment or integrated into the tent itself. * A groundsheet is used to provide a waterproof barrier between the ground and a sleeping bag. With double skin tents, the inner tents normally have a sewn-in groundsheet, but a separate flat groundsheet may be provided for any living area. With single skin tents, the groundsheet may be sewn in or separate. Normal practice with sewn-in groundsheets is for the groundsheet to extend some 15 cm (6 in) up the lower part of the walls (sometimes called a 'bathtub' arrangement); this copes with a situation where water seeps under the side walls of the tent. Separate groundsheets allow loadsharing when backpacking, and may make it easier to pitch and strike a tent, but they provide less protection against insects etc. getting into the sleeping area; also, if any part of a separate groundsheet protrudes from under the side walls, then it provides a ready path for moisture to flow into the tent. * The poles provide structural support. They may be collapsible for easier transport and storage. Some designs use rigid poles, typically made of metal, or sometimes wood. Other designs use semi-rigid poles, typically made of fiberglass, or sometimes of special metal alloys. Another pole type uses inflatable beams as the structural support. A wooden stake supporting a tent. * Stakes (or pegs) or screws may be used to fasten the tent to the ground. Some are attached to guy ropes that pull outward on the poles and/or fabric to help shape the tent or give it additional stability. Others are used to anchor the bottom edge of the fabric to the ground. Pegs may be made of wood, plastic, or metal. A mallet may be needed to drive thicker pegs into the ground. Skewer metal pegs consisting essentially of a length of thick wire with a hook on one end can usually be inserted by hand, except if the ground is very hard, but may not be as strong as more substantial pegs. Pegs used for guy ropes should not be driven vertically into the ground; instead for maximum strength they should be driven in at an angle so that the peg is at right angles to the guy rope attached to it. Lighter free standing tents may need some guy ropes and pegs to prevent them from being blown away. * Air vents help reduce the effects of condensation. When people breathe, they expel quite a lot of water vapour. If the outside of the tent is colder than the inside (the usual case), then this vapour will condense on the inside of the tent, on any clothing lying about, on the outside of a sleeping bag, etc. Hence ventilation helps to remove the vapour, although this may let in cold air. * An optional tent footprint or groundsheet protector may be used. This is a separate flat groundsheet which goes underneath the main groundsheet, and is slightly smaller than that groundsheet. The intention is to protect the main groundsheet, especially when camping on rough terrain, since it is much cheaper to replace a separate footprint groundsheet than it is to replace a sewn-in groundsheet. Coleman Tents

 

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