Construction Of Cavity Wall and Its Benefits

Elements of Cavity Walls

Cavity wall which is also termed as hollow wall, consist of two layers isolated by an empty space. The layers are generally masonry like brick or concrete block. The inner wall is addressed as internal leaf and the outer wall is addressed as external leaf.

The cavity size should be about 4 to 10cm between two walls. The internal and external leaves must have minimum 10mm thickness. The two leaves are interconnected by metal ties or links as shown in the figure below.

cavity wall

Benefits of Cavity Walls

The following benefits of cavity wall in comparison with solid walls.

  • Cavity walls provide superior insulation with respect to solid walls. This happens due to the space provided between two leaves of cavity walls.
  • Cavity walls are less expensive in comparison with solid walls.
  • The moisture cannot enter from the outer wall to inner wall as there is no direct contact. As a result, it also prevents dampness.
  • They also provide good insulation against sound.
  • They also lessen the weights on foundation for the reason that of their lesser width.
  • They offer protection against efflorescence.

cavity wall vs solid wall

Cavity Wall Insulators

Cavity wall insulation is basically used to diminish heat loss through a cavity wall by filling the air space with material that hinders heat transmission.

Construction of Cavity Walls

Generally there is no necessity of any footings to build a cavity wall. What is more important is just a firm concrete base on which the entire cavity wall can be constructed. Two leaves are built as if it is a normal masonry but minimum cavity must be included in between them. The cavity may be blocked with lean concrete as shown in the figure below:

Construction of Cavity Walls

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