Case
Summer heat.

How to fight summer overheating:

Thermal insulation is the most effective protection against summer overheating. We can see it from the results collected during extremely hot summer in 2015, when the air temperature reached up to 36 °C.

Insulated houses showed up to 5 °C lower temperature inside in comparison with non-insulated house (No.3).

Specifically, non-insulated houses recorded interior temperature more than 30 °C. Interior temperature in brick or concrete houses with insulation reached 26 °C on average, which is a value within the comfort zone.

Moreover, the south-facing windows were not protected by blinds.

House No. 1

Wall material

Concrete

Mass of wall material (kg/m2)

475

Insulation

Resolution XS 022

Insulation thickness

14 cm

Rise of temperature in houses

24 °C

House No. 2

Wall material

Concrete

Mass of wall material (kg/m2)

475

Insulation

Insulation thickness

20 cm

Rise of temperature in houses

25 °C

House No. 3

Wall material

25 cm brick

Mass of wall material (kg/m2)

245

Insulation

-

Insulation thickness

-

Rise of temperature in houses

30 °C

House No. 4

Wall material

25 cm brick

Mass of wall material (kg/m2)

245

Insulation

Insulation thickness

18 cm

Rise of temperature in houses

27 °C

House No. 6

Wall material

Wooden frame construction

Mass of wall material (kg/m2)

60

Insulation

Insulation thickness

6 cm

Rise of temperature in houses

29 °C

House No. 7

Wall material

Wooden frame construction

Mass of wall material (kg/m2)

60

Insulation

Insulation thickness

6 cm

Rise of temperature in houses

29 °C

House No. 9

Wall material

50 cm brick filled with mineral wool

Mass of wall material (kg/m2)

347

Insulation

-

Insulation thickness

-

Rise of temperature in houses

28 °C

House No. 10

Wall material

Massive wood

Mass of wall material (kg/m2)

155

Insulation

Pavatex wood fibre

Insulation thickness

20 cm

Rise of temperature in houses

28 °C

24 °C
28 °C
29 °C
30 °C
28 °C
25 °C
29 °C
27 °C

Wall construction as heat storage:

Besides thermal insulation, the key factor of heat accumulation is the wall construction material. The measurement approved that massive heavy walls accumulated sun heat during the day and radiated it during colder evening and night hours. This effect ensures a more stable interior temperature.

Specifically during the summer it keeps the temperature inside lower and more comfortable. The "lighter" the wall construction is, the higher is the temperature inside during hot summers - despite that the U-parameter (heat transfer coefficient) and the insulation efficiency are the same.

The massive insulated construction stays cool much longer during hot summers because they can store more energy.