Användande av diffusionsspärr vid tilläggsisolering av äldre byggnader med trästomme

Sammanfattning

In the current situation a big part of

the settlements that exist in Sweden is

in need of renovation and energy

efficiency in order to survive.

Therefore, also many of the older houses

with a wooden structure are in a need of

energy efficiency, which can be done in

a variety of ways, including adding

insulation.

This project deals with whether the use

of a diffusion barrier or a vapor

barrier affects a wall structure by

adding insulation to an older house with

a timber frame. The insulation materials

which are concidered in this

investigation are mineral wool and wood

fiber insulation. Efforts are focused on

the effects of moisture on these

insulation materials.

To demonstrate the differences that

arise the moisture measurement program

WUFI have been used to simulate a

variety of wall designs. These designs

are developed in consultation with the

construction carers who are active in

the industry.

Using WUFI graphs illustrating the

moisture levels of the wall structures

were obtained and from these conclusions

vould be drawn. The work demonstrates

the differences that arise when using a

diffusion barrier or vapor barrier in

wall construction. The differences

between an external and an internal

insulation is also depicted in this

work. In addition, mineral wool and wood

fiber insulation are compared.

Conclusions drawn from the work is that

if you have an interior insulation the

most advantageous is to use a diffusion

barrier in the wall construction. If you

have an exterior insulation, however,

the most advantageous is to use a vapor

barrier with varying water vapor

resistance.