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7
2. Waarom ventilatie
2.1 Ventilatie is noodzakelijk
Vroeger bouwde men huizen waarin aller-
lei luchtlekkages voorkwamen, zoals bij
de muur-, vloer- en dakaansluiting. Ook
was de kierdichtheid van ramen en deuren
slecht.
Door al deze openingen kon er een vrij
grote hoeveelheid lucht het huis in en uit.
Bij een beetje wind werd soms al drie tot
vier maal per uur de gehele inhoud van de
woning geventileerd. Hierdoor ging heel
wat energie verloren uit de woning, maar de
ventilatie was daarentegen uitstekend.
De wijze van bouwen is echter veranderd.
Waar mogelijk worden vloeren, wanden en
daken nu voorzien van een isolatielaag.
Met het aanbrengen van isolatie en het
verbeteren van de kierdichting neemt de
luchtdichtheid toe.
Het is een misverstand om te veronder-
stellen dat met het uitschakelen van het
ventilatiesysteem de woning over voldoende
ventilatie beschikt. In een luchtdichte
woning is ventileren absoluut noodzakelijk
om vocht-, schimmel- en gezondheids-
problemen te voorkomen.
7


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