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Il Falso Mito dei Muri che Respirano

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Ma i muri respirano? Vai al video per approfondire: https://www.facebook.com/Terracalce/videos/178697013118228/

E' vero che se i muri non respirano si hanno problemi di umidità interna negli edifici? Sfatiamo questo falso mito e scopriamo invece su quali aspetti occorre porre l'attenzione per migliorare il comfort interno. Parleremo di edifici in legno e paglia, intonaci in terra cruda e in calce.

Published in: Engineering
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Il Falso Mito dei Muri che Respirano

  1. 1. Ricambio d’aria 0,5 volumi/ora Passaggio del vapore per diffusione Resistenza totale al passaggio del vapore Umidità relativa interna Rispetto al vapore totale della stanza Credit: Comparison of moisture transport by diffusion with bulk-air ventilation from Cambridge Architectural Research Ltd. (CAR): Moisture transfer and the significance of breathability in buildings
  2. 2. 95-98% 2-5% Vapore acqueo Diffusione attraverso strutture Ricambio d’aria 0,5 volumi/ora
  3. 3. Quantità potenziale di accumulo d’acqua per diffusione del vapore Quantità potenziale di accumulo d’acqua introdotta da una perdita d’aria attraverso un foro di 2,5x2,5 cm Parete che respira…Parete realizzata a regola d’arte (che non respira)
  4. 4. ATTENZIONE!! La conducibilità termica dei materiali aumenta all’aumentare del contenuto di umidità
  5. 5. Volano igrometrico (effetto tampone) o capacità accumulo vapore per diversi materiali, testati in laboratorio Credit: Investigation about moisture buffering from VTT/Finland: A Survey of the Breathable Building Structure Concept: Effects of Insulation Materials
  6. 6. Cartongesso Fibra Cellulosa Poliuretano Fibra Cellulosa Poliuretano Fibradilegno FibradilegnoCartongesso
  7. 7. Accumulo di umidità durante le prime 8 ore dopo il cambiamento delle condizioni al contorno (dal 50% RH al 75% RH) Fibra di legno Fibra di cellulosa Poliuretano Accumulodivaporeacqueog/m2
  8. 8. Accumulo di umidità durante le prime 8 ore dopo il cambiamento delle condizioni al contorno (dal 50% RH al 75% RH) Fibra di legno Fibra di cellulosa Poliuretano Cartongesso Poliuretano Accumulodivaporeacqueog/m2 Cellulosa

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