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  • Lisäeristyksen suunnittelu
  • Lisasoojustuse planeerimine
  • Planning additional insulation
  • Planering av tilläggsisolering

Ventilation of the ceilings

In a ventilated ceiling, there is air space between the cover and the insulation. The space is in contact with outdoor air, and any moisture coming through the ceiling will be ventilated away due to gravity, a difference in pressure caused by the wind, or sometimes also mechanically.

For pitched roofs, it is wise to make use of the good ventilation efficiency of the chimney by installing a ventilation grid on the ridges of the gables of the structures.

Additional mechanical ventilation can cause condensation in the structure’s cold parts, in which case the ceiling’s air barrier is not airtight; the worse the ceiling air-tightness is and the better the ventilation, the more indoor air humidity permeates through. That is why it is sometimes necessary to improve air-tightness either by renewing the cladding or by removing the old insulation material and installing an air barrier via the attic.

Surveys

It is wise to plan additional insulation very well. Old structures must be extensively surveyed, and a construction-physical inspection must also be performed at the site; for example any vapour barrier films, paints and other airtight surfaces can quickly cause mould and rot damages.

Choosing the material for additional insulation

In case the old insulation material is organic (sawdust, moss, etc.), it is wise to use Ekovilla insulation as the additional insulation material, as it is also organic. This is so because the structures of that time do not have a vapour barrier layer, but an airtight paper instead.

After additional insulation has been installed, the temperature of the old insulation will increase, and it will be capable of binding more moisture as well. An important characteristic for additional insulation is the ability to bind and release moisture just like the old insulation material. This prevents the condensation of moisture and any possible microbe growth between the old organic sawdust insulation and the additional insulation.

Ventilation of the ceilings

In a ventilated ceiling, there is air space between the cover and the insulation. The space is in contact with outdoor air, and any moisture coming through the ceiling will be ventilated away due to gravity, a difference in pressure caused by the wind, or sometimes also mechanically.

For pitched roofs, it is wise to make use of the good ventilation efficiency of the chimney by installing a ventilation grid on the ridges of the gables of the structures.

Additional mechanical ventilation can cause condensation in the structure’s cold parts, in which case the ceiling’s air barrier is not airtight; the worse the ceiling air-tightness is and the better the ventilation, the more indoor air humidity permeates through. That is why it is sometimes necessary to improve air-tightness either by renewing the cladding or by removing the old insulation material and installing an air barrier via the attic.

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