Cavity wall Heat insulation

Cavity wall Heat insulation

It can be applied in all buildings during the construction and in existing buildings in case of replacement of drawn frames with opened or parallel so as to fill the void with insulating plates. In blind walls with gap of existing buildings if exterior heat insulation is not feasible, holes can be opened temporarily and fill with certain methodology the gap with NEOPOR grains. In double wall at the procedure of manufacture the two shells of stonework should be connected to each other with truss aid (senaz) at least per one meter of height. They should similarly be insulated so as to avoid the shaping of thermal bridges, as of course columns and beems while these are all from concrete which has 4 times larger losses than the brick.

It is recommended, the gap between the 2 walls to be filled with insulating material because during construction in the elements of concrete (columns, beems, senaz) it cannot be easily placed more than 5cm insulating material which with the new regulation of heat insulation (Regulation of Energy Efficiency of Buildings) is not sufficient therefore it should equal to the bad (biggest) κ of elements of concrete with considerably better (smaller) in double wall with bricks. If nevertheless remains gap of air this should be from the side of the external brick and the insulating material to be adjoined with the internal brick. Even if all elements of concrete are insulated but not the wall, then the thermal bridges are not eliminated as in the external heat insulation, but they simply become linear than superficial.

For this application we can use Expanded Polystyrene with graphite NEOCOAT TX EPS100 especially in the case of drawn frames (prefer opened or parallel) therefore the available thickness for heat insulation is smaller ISOPLAK TX EPS 120 or ISOPOR EPS 80 or ISOCOAT TX EPS 80 in the suitable thickness according to the regulation of Energy Efficiency of Buildings. During the placement the insulating material must be well fixed on the wall and adjoined in the two shells.

ADVANTAGES AND DISADVANTAGES OF HEAT INSULATION IN CAVITY WALL

Advantages

  • It is the easiest way of placing insulating materials
  • Rain doesn’t influence the insulating protection of the wall.
  • Constitutes the most balanced form of thermal protection against the cold of winter and the heat during summertimeIt allows the exploitation of thermal capacity of the wall (even partial).

Disadvantages

  • It does not have good anti-seismic behavior. It is usual the phenomenon in walls with defective connection of two shells the external shell to be cut and falls after a powerful seismic vibration.
  • It does not exploit fully, the thermal capacity of the wall. However, this it is possible to increase proportionally with the thickness of wall of the internal shell.
  • Likely the shaping of condensation due to diffusion of water vapor that is realized in the core of the wall therefore is difficult to slip.