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Hérisson de pierre sur terre battue


En construction, un hérisson est une couche de moellons placés sur chant, ou de pierres concassées ou roulées sur une épaisseur avoisinant les 25 cm, posé sur un sol en terre battue recouvert d'un centimètre de chaux hydraulique.


Il sert d'assise à une dalle sur terre-plein.


Il sert également à bloquer les remontées d'humidité, en remplacement d'un vide sanitaire.


On appelle cette technique « hérisson » parce les pierres sont dressées à la verticale un peu comme les piquants d'un hérisson. Les vides entre les pierres, le faible nombre de points de contact entre elles fait que l'eau, s'il y en a un peu sous la maison, ne peut pas remonter par capillarité. Puis, cette technique a évolué. On a mis des cailloux propres, parfois du sable stérile. Dans ce dernier cas, il y a beaucoup de points de contact entre les divers grains et l'eau, l'humidité peut donc remonter par capillarité. Pour éviter ce problème, avant de couler la dalle, on tend une feuille de polyane sur l'ensemble, ou du béton hydrofugé.



Alternatives |


  • Radier


Liens externes |



  • Construire sa maison Sur Wikibooks
  • Portail du bâtiment et des travaux publics Portail du bâtiment et des travaux publics

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