Do-it-yourself ventilation of a cold attic in a private house: Tips for the device + Video

Nobody is surprised at the necessity of mandatory insulation of the attic space to create a comfortable microclimate in the home. Many people do not even think about arranging a proper ventilation system in this room. But high-quality ventilation of the attic helps to maintain a microclimate there, prevents fungi, rot and mold, and increases the service life of the roofing structure. Correctly calculated and thoughtful ventilation is no less important than competent steam and heat insulation.

[contents ]

Attic space: need for ventilation

The design of the ventilation system is an essential part of the design.

Ventilation is involved in the heat exchange processes of the entire residential building.

In the hot season, the roof can heat up over a hundred degrees, and heated hot air enters the house, exacerbating the heat in it. Other problems may occur during cold weather. The cooled air forms condensation drops on the insulated ceilings: this moisture negatively affects the wooden elements.

Even simple ventilation can prevent premature damage to the rafters.

Attic: ventilation

There are different types of attics in different buildings: they have different purposes, respectively, their arrangement and decoration differ. According to the main feature, attics are divided into two main types - warm and cold.

The latter type is more traditional. In such a case, the system of roofing structures is not protected in any way, since only the floor is insulated. The other type has only one important goal - to properly protect engineering communications.

Cold attic: ventilation device

A cold attic room should have controlled ventilation. To equip it, the rafters and battens are left uncovered.

A good alternative is a special lining with gaps to allow air to circulate freely. If, however, slate or ondulin are used as roofing, and there are no vapor and wind insulation films there, then you do not need to worry about a special ventilation device in the attic.

Ventilation device for the under-roof space on the roof

Between individual by the waves of the roof, the air enters the space under the roof without interference and goes out .

The metal tile is also capable of ventilating itself, but it can cause condensation, so the use of an insulating film is mandatory in this case.

On a gable roof, ventilation ducts are located in the gables.

Loosely located overhangs can be quite an effective way to solve the problem.

Narrow slots, evenly distributed, will favor high-quality ventilation of the entire attic.

But if the lining is too tight, or in the case when the gables are made of stone, holes will have to be made in the walls. It will be rational to arrange them on opposite sides, thereby ensuring the exclusion of foci of stagnation. The total S (area) of the ventilation ducts should be 0.

2% of the area of ​​the entire floor.

Another is possible an option to save money. It involves the installation of typical ventilation grilles, one of which is adjustable, the other is directed downward with its holes. The mosquito net will protect them from insects.

If we are dealing with a hip roof, the ventilation device will be made differently.

At the bottom, in the filing, an inlet is made, and on top, at the ridge, is an exit. In the case when the filing of the overhangs is made of wood, the beams do not have to be placed tightly, there may be a gap of several millimeters between them. If the stitching was carried out with plastic, then all components must have holes. Such panels are called spotlights.

It is possible that the binder is packed quite tightly.

What should be done in this case? For this, special lattices are produced, equipped with a mesh. They have a diameter of five centimeters: they are placed every 0.8 meters, along the entire length of the wind overhang. Use a drill with a suitable (round) drill to punch holes. The top conclusion is made from above.

In general the types of ventilation largely depend on the type of roof. For example, a classic skate is suitable for slate and euro-slate. With an elastic flexible roof, a ventilated ridge or turtle is successfully used. Also, a special valve is used for ceramic tiles.

The metal tile is perfectly ventilated using a standard ridge.

I must say that the ridge is not just an economically advantageous replacement for a valve. It is also a great way to get a ventilation system in the shortest possible time.

Sometimes special dormer windows are used, with bars or glazed, but their construction is a rather difficult task, which requires theoretical knowledge and practical skills.

Warm attic: ventilation

In modern heating systems, natural circulation is practically not used. In other words, if it is planned to turn the attic into an attic, the roof must be made completely ventilated.

For a roof made of flexible tiles or sheet material, you will have to equip a special ventilated area: a counter-rail is sewn onto the rafters.

For metal roofs it is advisable to use windproof film . A slate roof can do without a counter batten, since the air must flow freely from the bottom up. The entrance is arranged in the filing, the exit to the outside occurs through the ridge.

The attic should be ventilated in the same way as other rooms.

Air enters through the windows (possibly the device of VTK valves), and leaves the house through the ventilation holes. If they are absent in the walls, then fungi (aerators) are made at the place of the hood, on the roof.

Ventilation of the attic in the house: truth and fiction

Questions concerning high-quality ventilation of the attic are overgrown with rumors and speculation. Which facts about proper ventilation are fair and which are not?

• Is it true that warm air escapes from the house through the ventilation ducts in winter? There is an opinion that the operation of ventilation in the cold season only interferes with heating the home. In fact, it is unlikely that holes are the cause.

  In the case when the dwelling heats up for a long time and then cools down quickly, it is not the ventilation that is to blame, but the insulation. I must say that not too high-quality insulation is able to let moist air into the attic. The consequence of this phenomenon is often the formation of condensate drops, which, in turn, cause damage and decay of the wood of the floors.

• Is it true that ventilation is only required during hot weather? There is a belief that ventilation is necessary only in summer, when the temperature rises strongly. In reality, this is not the case.

  If you do not carry out ventilation measures in winter, this is fraught with the formation of icicles, the development of fungi and mold.

• Is it true that the size of the ventilation holes does not matter? This is also a delusion. It is not necessary to equip the channels "by eye", as it is likely that the efficiency of such a system will tend to zero. The airs should be related to the slabs as one in five hundred.

Attic Ventilation: Tips

• 

  The holes located along the ridge of the roof should be given special attention.

  Traditionally, they are placed as close to the ridge as possible.

• The ventilation system must be sufficiently stable to withstand any climatic conditions.
• An important condition for high-quality ventilation is that air vents must be installed inside the attic, between the rafters. Holes should be made to prevent air clogging or blockage.
• Continuous soffits can be installed under the eaves themselves.

  They must be fitted with a shielding mesh. Holes made of aluminum or plastic, which are not corrosive, are preferred.

• It is good to use a roof-mounted fan from the outside to extract air. There should be a distance of eight meters between the fan and the supply system.
• To install supply ventilation, select the cleanest area of ​​the room.

• A special recuperator is installed for cooling and heating air.
• Ventilation pipes must be covered with diffusers or grilles.
• Special dormer windows are not only of great functional importance, but also serve to decorate the structure.

( 1 grade, average 5 of 5 )