Conventional vs Passive

THE HEAT INSULATION OF THE BUILDING IS A MAIN FACTOR FOR THE COMFORT OF DWELLING AND SIGNIFICANT REDUCTION OF HEATING AND COOLING COSTS

The thermal insulation of prefabricated houses not only contributes to the energy efficiency of your home, but it also provides you with pleasantly warm walls in winter and pleasantly cool walls in summer. The difference in a well-insulated house between the wall and the air inside can be 1⁰, while in a non-insulated building it can reach 6-7 and more degrees. This creates discomfort of living and a sense of flow in the room, that is, life becomes comfortable and healthy.

Poor insulation also has a strong impact on the cost of heating in winter and cooling in summer. With proper insulation, these costs can be minimized and the investment made pays off very quickly. Thermal bridges and condensation are also avoided.

The main advantage of PREFABRICATED HOUSES is precisely that their construction allows very easily to achieve the above effects, which in monolithic construction are achieved with more cost and effort.

What does it mean for a house to be warmly insulated and how is this established?

The building, during the winter period, constantly gives off heat outside, these are the heat losses that are realized due to the differences in temperature between the rooms and the atmosphere outside.

Thermal conductivity shows the amount of heat that passes at a constant temperature for 1 second through a surface with an area of ​​1 m2 and a thickness of 1 m, when the temperature difference between outside and inside is 1K. The unit for thermal conductivity is W / m2K.

In Bulgaria, there is an adopted standard for housing construction, which determines the maximum value of this coefficient and it in 0.280 W / m2K. The lower this coefficient, the better the thermal insulation of the building.

Prefabricated houses have a coefficient lower than this and therefore they are more energy-efficient and depending on its value can be low-energy or passive.

Residential buildings

Class

Residential buildings

In the tables below we show with d - wall thickness , U - heat transfer coefficient , characterizing how well and insulated the building. In the U-ref. The standard adopted in Bulgaria for newly constructed buildings is shown . 

Conventional construction

d

U

U-ref

cm

W/m2k

W/m2k

Materials

Rendering

2.5

Austrotherm EPS 100 - Plus

5

Brick Wienerberger Porotherm 38 N+F Comfort

38

Rendering

2.5

Total

48

0.185

0.280

Here is the conventional construction using materials that have the best thermal insulation properties, namely WIENERBERGER Porotherm 38 N + F Comfort bricks with a thickness of 38 cm and Austrotherm EPS 100-PLUS with a thickness of 5 cm. In this position, U = 0.185 W / m2K at a wall thickness of 48 cm. That is, a house built in this way can be qualified as low-energy, but as you can see the wall is quite thick - 48 cm, which takes a lot of useful area of ​​the house.

Below you can see several tables of PREFABRICATED HOUSES , which are low-energy and even the heat transfer coefficients are lower, but their wall thickness is smaller. This means that they are much better thermally insulated and the usable area is much larger, and therefore the comfort of living is significantly better and overhead costs are lower.

Prefabricated wooden house Economic

Materials

U-ref

U

d

W/m2k

W/m2k

cm

Silicate exterior plaster

0.3

Putty

Expanded polystyrene foam - EPS

Board shell

BATA knauf

Vaper insulation membrane

Drywall

Total

0.5

5

1.2

15

0.1

1.25

23.35

0.188

0.280

This house can be qualified as the lowest class of prefabricated houses in terms of thermal insulation characteristics, but still it is much better than the standards in Bulgaria and is equal to the low-energy house built in a monolithic way. The thickness of its wall is 23 cm, and the monolithic wall is 48 cm.

Prefabricated wooden house Eco Standard

Materials

d

U

U-ref

cm

W/m2k

W/m2k

Silicate exterior plaster

Putty

PAVATEX ISOLAIR 35mm

BATA KNAUF

Board shell - OSB 3

Drywall - 'KNAUF'

Total

0.3

0.5

3.5

16

1.2

1.25

22.66

0.185

0.280

With this standard the wall thickness is 23 cm and the thermal insulation is a little better than the "ECONOMIC" standard.

Prefabricated wooden house Eco Standard

d

U

U-ref

cm

W/m2k

W/m2k

Materials

Silicate exterior plaster

Putty

PAVATEX ISOLAIR 35mm

PAVAFLEX PLUS

Board shell - OSB 3

PAVAFLEX PLUS

Board shell - OSB 3

Drywall - 'KNAUF'

Total

0.3

0.5

3.5

16

1.2

5

1.2

1.25

28.55

0.147

0.280

This standard has the highest class of thermal insulation. With it U = 0.141 W / m2K with a wall thickness of 29 cm.

From the above it is clear that in terms of thermal insulation PREFABRICATED HOUSES have no competition and they create a living environment, which with other building technologies is more difficult to achieve. The costs for achieving the same thermal insulation characteristics in PREFABRICATED CONSTRUCTION are lower than in monolithic .

Small tip

Because your future expenses depend on the energy-efficient systems implemented in your new home, it might be even possible to generate more energy than you use. In the future, solar panels will be a must to have an attachment to your new home. However, you can see other sustainable sources of energy.