Intelligent air sealing

System INTELLO Funktionsweise - 3D

 

The effects of moisture and the potential for no structural damage

  • Mois­ture can pen­et­rate con­struc­tion­al ele­ments in a vari­ety of ways and can nev­er be com­pletely elim­in­ated
  • However, ex­cess­ive mois­ture causes struc­tur­al dam­age
  • It is not the tight­ness or dens­ity of a va­pour re­tarder that de­term­ines wheth­er dam­age to con­struc­tion­al com­pon­ents is avoided or not but the dry­ing re­serves the com­pon­ent has
  • Va­pour re­tarders with high dif­fu­sion res­ist­ances do not al­low suf­fi­cient sub­sequent evap­or­a­tion of the struc­tur­al com­pon­ent to the in­side

In­tel­li­gent air seal­ing mem­branes provide a high level of pro­tec­tion for com­pon­ents

 

section summer winter

The best approach: Intelligent membranes

Vapour retarder membranes with a humidity-variable diffusion resistance provide the best protection against condensation water damage to building structures. They become more impermeable to diffusion in winter and protect the insulation against moisture penetration in an ideal manner.
In summer, they can reduce their diffusion resistance very significantly and thus ensure the best possible drying-out conditions.

Operating principle of moisture-variable airtightness membranes

Operating principle of moisture-variable airtightness membranes

Mois­ture-vari­able lay­ers op­er­ate on the prin­ciple of cli­mate-driv­en mem­branes. They re­spond to the hu­mid­ity in their en­vir­on­ment and ad­just their dif­fu­sion res­ist­ance in­tel­li­gently to the cur­rent re­quire­ments.

In winter, the mean am­bi­ent hu­mid­ity of the va­pour re­tarder is ap­prox. 40 %. The dif­fu­sion dir­ec­tion is from the heated in­teri­or to the ex­ter­i­or. The va­pour re­tarder now must have a high res­ist­ance to dif­fu­sion in or­der to pro­tect the struc­ture against con­dens­a­tion.

In the sum­mer, the mean am­bi­ent hu­mid­ity of the va­pour re­tarder is more than 80 % and the dif­fu­sion dir­ec­tion is re­versed. Now the va­pour re­tarder must be per­meable in or­der to al­low the hu­mid­ity to evap­or­ate.

Intello Intello plus Diffusion

Diffusion resistance depending on ambient humidity

The va­pour re­tarder and air seal­ing mem­brane pro clima IN­TELLO meet the re­quire­ments lis­ted above.

The val­ues of IN­TELLO

  • sd-value:
    less than 0.25 m up to >25 m (in sum­mer <0.25 m)
  • g-value:
    less than 1.25 MNs/g up to >125 MNs/g (in sum­mer <1.25 MNs/g)

INTELLO & INTESANA: Diffusion [US perms]

  • wa­ter va­por per­meance:
    more than 13.12 US perms down to <0.13 US perms
    (in sum­mer >13.12 US perms)

The great­er the spread of the dif­fu­sion res­ist­ance/per­meab­il­ity from sum­mer to winter, the more pro­tec­tion is provided for con­struc­tion­al ele­ments - even in case of un­fore­seen mois­ture pen­et­ra­tion.

For the best pos­sible pro­tec­tion from struc­tur­al dam­age, the dry­ing re­serve must be high­er than the max­im­um the­or­et­ic­ally pos­sible mois­ture level.

INTELLO & INTESANA: Diffusion rules

The 60/2 and 70/1.5 rule

... us­ing the sd-value, re­spect­ively:
The 60/10 and 70/7.5 rule (g-value)

To pro­tect struc­tures even with tem­por­ar­ily in­creased re­l­at­ive hu­mid­ity, a va­pour re­tarder used in an en­vir­on­ment with

60% av­er­age re­l­at­ive hu­mid­ity (ex­ists in new build­ings or tem­por­ar­ily in kit­chens and bath­rooms, for ex­ample) should reach a

  • dif­fu­sion res­ist­ance of at least 2 m (sd-value)
  • dif­fu­sion res­ist­ance of at least 10 MNs/g (g-value)

70% av­er­age re­l­at­ive hu­mid­ity (ex­ists dur­ing the con­struc­tion phase when plas­ter­ing walls or pour­ing floors) should reach a

  • dif­fu­sion res­ist­ance of at least 1.5 m (sd-value)
  • dif­fu­sion res­ist­ance of at least 7.5 MNs/g (g-value)

INTELLO & INTESANA: Diffusion rules [US perms]

The 60/1.64 and 70/2.2 rule (wa­ter va­por per­meance)

60% av­er­age re­l­at­ive hu­mid­ity should reach a

  • dif­fu­sion per­meab­il­ity of at most 1.64 US perms

70% av­er­age re­l­at­ive hu­mid­ity should reach a

  • dif­fu­sion per­meab­il­ity of at most 2.19 US perms

IN­TELLO re­li­ably meet both re­quire­ments.

In­creased mois­ture should al­ways be al­lowed to es­cape from the build­ing as rap­idly as pos­sible by open­ing win­dows for vent­il­a­tion. Dry­ers can ac­cel­er­ate the dry­ing pro­cess in the winter. Per­man­ently high re­l­at­ive hu­mid­ity should be avoided.