A properly assembled roof ventilation system can prevent the development of many damages to roof structures. Consider how the ventilation outlet for metal tiles is organized.
Is roof ventilation necessary?
The main purpose of ventilation systems is to maintain a healthy microclimate in the interior space. The presence of ventilation can ensure the productive operation of each element of the roof structure.
The effectiveness of ventilation depends on the operation roof insulationthat were carried out during the installation of the roof.
If there is no roof ventilation or it works inefficiently, then the following negative aspects may occur:
- The accumulation of condensate, which, settling on the rafters and other wooden roof structures, causes their decay and premature destruction;
- The accumulation of condensate on metal parts contributes to their corrosion, destroys moisture and concrete or brick parts.
- Poor ventilation contributes to the formation of moisture on the roof surface, which leads to the formation of ice and the destruction of the roofing material;
- The accumulation of condensate leads to wetting of the insulation layer, which loses its thermal insulation qualities. This leads to an increase in heating costs in winter and to overheating of the premises in summer.
Basic principles of pitched roof ventilation
The flow of cold outdoor air into the under-roof space is provided in the lower part of the roof. For this, so-called vents are arranged.
The air outlet is done from above, in order for ventilation to be really effective, it is necessary that the air movement takes place throughout the under-roof space.
The tasks that must be performed by ventilation pipes for metal tiles:
- Removal of accumulated water vapor penetrating into the under-roof space from the premises of the house;
- Roof temperature equalization. This moment allows you to avoid the formation of icicles and frost on cold cornices due to the runoff of water formed during the melting of snow on the warm surfaces of the slopes.
- Reducing the flow of heat that occurs in the under-roof space when the roof is heated by the sun.
If the house has an exhaust hood in the kitchen or a system of forced ventilation of the interior on the roof, it is mandatory to install ventilation outlets. An exit must also be made for the sewer riser; if this condition is not met, unpleasant odors may appear in the house.
The outlet of the fan pipe is connected to the sewer riser using a corrugated pipe equipped with an adapter ring. This outlet is not equipped with a cap so that ice does not form on it.
For ventilation of the under-roof space, deflectors are used - low-pressure fans, they serve to remove accumulated moisture from the attic and roof structures.
In modern construction, several types of roof ventilation systems are used. Air ducts or inlets for air flows, as a rule, are covered with decorative grilles made of metal or durable plastic.
Air outlets can be:
- Dotted;
- Continuous.
Point exits, otherwise called roof aerators, installed on separate sections of the ridge or on the slopes of the roof. These elements are shaped like a fungus, some models have built-in fans.
Continuous outlets are mounted along the entire length of the ridge. Roof ventilation elements are painted in the color of the roofing, so they do not spoil the overall look of the house.
How are ventilation outlets installed?
Installation of ventilation outlets entails damage to the roofing, as it will be necessary to make a hole for the pipe to exit.
To eliminate the risk of leakage in these places, special passage elements are used.These elements can be purchased from a roofing supplier, matching them to the color of the roof.
Consider how to install a ventilation outlet for a metal tile.
- As a rule, the output of one dot element roof ventilation planned for every 60 square meters of roof surface.
- It should be located closer to the ridge, the distance from the ridge to the ventilation element should not exceed 60 cm.
- If the roof has a complex architecture with a large number of valleys and intersections, then the number of output elements should be increased.
- To install the ventilation element, a template is used, which is included in the delivery. The template is laid on the surface of the metal tile and outlined.
- A hole is made on a sheet of metal tile along the intended line.
- The sealing rubber ring is attached to the surface of the metal tile with screws. Silicone sealant is applied along the outer contour of the seal.
- The passage element is installed in place, the seal loops are fixed on the corresponding pins of the passage element.
- The passage element is fixed with screws.
Advice! When installing ventilation through-through elements, it is important to use branded screws that are included in the delivery.
- From the side of the attic, a sealant for the waterproofing layer should be nailed. In places where the ventilation pipe passes through the layer of vapor and waterproofing, it is recommended to use silicone sealant and sealing self-adhesive tapes.
conclusions
The cost of roof ventilation elements, together with the payment for their installation, will be no more than 2-5% of the cost of the roof itself.This amount is ten times less than the amount that will soon be required for the repair of roof structures if the ventilation system is not installed.
Therefore, saving on the installation of systems is irrational and unprofitable, because well-organized ventilation of metal tiles will significantly extend the life of the roof and delay the time for expensive repairs.
When using high-quality passage elements for ventilation systems and observing the installation technology, the risk of leakage in the installation area of the ventilation pipes is practically zero.
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