The 3 most popular types of roofing is the pitched roof, quadruple roof and single pitched roof. Roofs can have one or more levels to the vertical sides of buildings, remember that they must always be sloping. The levels must protrude from the outer vertical surface of the perimeter walls and form what we call frames, so that the rainwater flows to the ground and of course away from the masonry of the building. The levels that shape the roof are arranged in different ways, but mainly depending on the shape of the floor plan of our building. This is a basic choice that directly affects the functionality and aesthetics of the building and its budget.
What is a roof?
When we refer to the roofs we mean roofing constructions, they are made of sloping levels so that it is possible to quickly remove rainwater and especially snow and of course they must be constructed evenly so as to reduce the risks of water passing, or humidity, noise etc.
In general, by the general title roof we do not mean only the load-bearing structures of the sloping roofs of the buildings, but also their waterproof coatings, as the main material is usually the tiles, other materials are concrete slabs, metal sheets or even other materials.
Wooden tiled roof
Usually the wooden roof is used when the owners want to “take out” an attic or it is generally used for design and construction convenience. The roof of your home is a key part of your home providing protection from rain, snow, sleet, hail, and sunlight and heat. Do this completely, the roof must be tightly sealed against water and weather conditions in Montclair.
Roofs need to be hard and durable, but they need to be flexible enough to handle all kinds of weather and any factors that come up above the location of your home. It is ideal that the roof is fireproof. There are many types of roofing, varying in design, materials used and more. Typically, a roof consists of the roofing material used for the main roof, the frame where the will is attached, and other aspects and components. Constructing or repairing a roof can be very simple or a very complex task, it will depend on the design and finish of your roof.
What is the angle of inclination of a roof? That when a roof has an inclination of 20% when the angle formed by its inclined planes with the horizontal plane has a tangent of 0,2, that is, it is equal to the acute angle of a right triangle, the opposite side of which will be 0,2 on the other vertical side.
Tiled roof, what is it?
What does it consist of and what is the construction of a tiled roof? On the roofs the load-bearing structure consists of trusses, i.e mesh beams of suitable shape, which are placed parallel and form a grate. On the main grate, i.e on the sloping sides of the trusses, are placed simple wooden beams (rafters), which sometimes with other perpendiculars to the previous ones (rafters) form a grate with smaller openings. Where ridge lines (grooves) or groove lines are formed (grooves or derides), the basic trusses of the roof are combined with semi-mixed or false-jointed or replaced by them.
It is usually a sloping roof of buildings made of a wooden base on which the tiles are placed. Covering the roof with a tiled roof has been a traditional way of covering for centuries. The tile as a material has many advantages, it is impermeable to water but at the same time it is breathable, it is non-combustible and has a large capacity of radiation and external temperature.
Most houses in the high-altitude areas, where it usually snows in winter, are covered with a tiled roof, the sloping roof helps to remove the snow and to insulate the building. Tile roofs are found mainly in detached houses or small buildings, and it also stands out in terms of construction in gabled, single glazed. etc.
Tile roof insulation, what should we look out for?
Properly covered, it will withstand a great deal of adverse conditions. Works either above or below polystyrene insulation. It goes without saying that the more correctly placed, the more it will protect our roof. It can and must be completely laid on the outside, i.e on top of all the wood, in this way we will have complete protection of the wood.
Thermal insulation and ventilation of the tiled roof, what should we pay attention to? Ventilation of the entire structure must be ensured. Although polystyrene is unaffected by water vapor, however the elements of the wooden construction can corrode in case of poor insulation. The membrane has a water vapor permeability coefficient <0.1m allowing the water vapor to pass unimpeded through it, almost as if it were not present.
How should the film be placed?
The membrane always extends from the right to the left, always from the bottom up and of course parallel to the top. The printed marks of the company we have chosen as a supplier must always be visible. The glossy gray strip that covers the glue for joining the rolls together should always be at the top of each roll. Each subsequent roll must be placed to cover exactly this strip without waves and wrinkles and without of course at this stage to glue the self-adhesive seams.
What is mechanical support?
The mechanical support, the so-called nailing is done at the top and specifically in the zone that will be covered by the self-adhesive strip of the upper membrane. The adhesive strip is therefore always in the lower membrane, the lower membrane, when placed. Next is the top layer of film that presses like a tile on this adhesive zone. No matter how many nails it receives, even if it is removed after the nail, it will heal itself, always remaining tight.
Self-adhesive stapling With the simplest self-adhesive stapling, a breathable but windproof shell is created. So the cold wind can no longer affect the thermal insulation. The difference in wind pressure on the tiled roofs creates a very strong current which, apart from cooling, brings 1000 times more moisture than the outgoing water vapor. In addition, the membrane prevents the accumulation of dust brought by the wind.
What is the Safety Ventilation Zone?
If conventional thermal insulation materials are used, e.g. slabs of polyurethane, stone wool, polystyrene, etc., which are all vulnerable, in such constructions we take care of a 2nd zone (shell) of ventilation internally so that any internal water vapor condensation evaporates behind the dam.
How is typical roofing construction done?
- Visible or blind.
- The roof is lined with robotic pine boards with a cross section of 14-28 mm.
- Roofing pole is made of solid or glued wood (the cross section is proportional to the loads of the roof).
- The roof is finished with beams or blinds.
- Pine roofing 16mm, impregnated (Alternatively 12mm or 18mm).
- Membrane – water vapor barrier.
- Styrofoam 50mm.
- Stone wool.
- Windproof membrane.
- Scratching with logs 60 x 40 mm.
- Greek or Roman type tiles (Swedish type alternatives).
- Roof window (if required).
What should you pay attention to and demand in the restoration or in the construction of a new roofing?
The right substrates in 3 general categories:
- The continuous (sliced) substrates: e.g. from OSB panels, plywood or rabotwood.
- Discontinuous substrates: scissors or payers.
- Thermal insulation panels.
Other additional film selection criteria:
- Is the roof warm or cold?
- Is the roof ventilated or non-ventilated? Remember that when we say ventilation we refer to the gap between the membrane and the thermal insulation layer.
- The slope of the roof. The smaller the slope, the more functional and efficient the membrane should be.
- The type of overlay element. For example, when we have bituminous tiles, the far better choice is an SBS, self-adhesive, elastomeric, bituminous film.
- New roofing construction or restoration? The choice is yours.
- The distance between the scissors. Affects the mechanical properties of the membrane. In some countries the membranes have to go through the so-called “steptest”. The membrane must hold the weight of the craftsman if it accidentally presses between the scissors.
- Can the tile roof be used on laminated substrates? Or is it prone to the “tent phenomenon”.
- Resistance to water penetration. To which of the three classes does the membrane belong?
- UV resistance. For how many months can the film remain in the sun without being irreparably damaged?
- Is the membrane expandingly stable? This has e.g. to do with the behavior of the membrane around the support nail.
- Flexibility in the cold. Critical parameter for areas with low temperatures.
- Resistance to high temperatures. Extremely critical in cases of insufficient ventilation and hot climates.
- Mechanical strengths of the membrane. As e.g. tensile strength, tear resistance around the nail, etc. Critical parameter in areas with strong winds.
- Anti-slip. Safety when the film is placed on laminated substrates.
- Combination of the tiled roof membrane with a reflective barrier.
- Membrane behavior in case of fire.
- Smells. Many membranes emit unpleasant odors especially in case of high temperatures.
- Can the membrane be food for rodents?
- Durability over time. What is the average expected functional life of the membrane?
- Repairability. How easy is it to repair the membrane in case of injury?
- Noise due to air. Many membranes are made in such a way that in case of strong wind they produce very annoying noises.
- Physical characteristics such as weight / m2, thickness, roll dimensions.
- Vapor permeability.