The quality of the roof in modern suburban housing largely determines its comfort and safety.
Roof ventilation is the most important element of its proper construction.
Importance of proper ventilation
Often, owners buy high-quality materials, investing serious money in roof repairs, but ignore the advice of specialists. As a result, roof ventilation is reduced.
From an amateurish point of view, it is not entirely clear why ventilation is needed, and how moisture appears in a dry house under a newly repaired or erected roof.
Let's analyze what happens if there is no roof ventilation.
In a residential building there is warm air, which rises with water vapor, i.e. in the attic or attic, and is collected directly under the roof. If snow falls on the roof, it melts and causes it to leak due to the backwater of melt water. Unorganized drainage causes dampening of the facade. Water flowing down the slope freezes, reaching the cold areas above the eaves, forming icicles. And this means that the ventilation of the roof was not done correctly.
When the roof temperature is below zero, all moisture,contained in the air of the under-roof space, turns into condensate on its inner surface. With a significant difference between the external and internal temperatures, there will be more water. And, as you know, a 5% increase in the humidity of the insulation leads to an increase in thermal conductivity by a factor of two or more.
Forced ventilation of the roof through the walls of the building leads to their premature destruction.
And also to create conditions for the development of mold.
Ventilation of a soft roof is also necessary, since summer overheating of it, together with exposure to ultraviolet radiation, reduces its service life and makes the attic room uncomfortable.
Modern ventilation systems
New ventilation systems use the natural ability of warm air to move upwards.
Basic principle: cold air enters through the vents from below and exits from above.
More efficient if air moves throughout the entire under-roof space.
Roof ventilation is performed for the following purposes:
• removal of residual water vapor penetrating upward from the interior;
• temperature equalization on the roof surface, which eliminates the formation of ice on the eaves, as a result of snow melt;
• Reduce heat build-up under roof sheathing from solar radiation.
Modern ventilation systems
Air inlets (vents) closeperforated decorative plastic or metal strips.
Roof ventilation involves the use of different types of air outlets: point and continuous. Point (aerators) during installation are placed in separate sections of the ridge or roof. They are mushroom-shaped, equipped with a built-in fan and integrated with the overall ventilation system of the house. Continuous are installed along the entire length of the ridge of the building, which provides better ventilation. As a rule, they are covered with roofing material from above and do not spoil the view of the building.
Roof ventilation is a necessary and most profitable investment in building a house.
