Background and earlier studies Problem description
Previous studies conducted by the participants have shown that energy optimization has to be done in connection with traditional maintenance and other changes of the building in order to be cost-effective. Furthermore, it has been pointed out that opportunities for thorough improvements of the building envelope and technical installations occur with a long interval so it is of utmost importance not to miss these opportunities by making a renovation without upgrading the energy performance of the specific building component up to, and preferably beyond the current requirements in the building code.
A Danish energy renovation project has proven that it is possible to renovate a typical Danish single-family house from the 1960/70’s in a cost efficient manner to roughly the energy performance standard of a new single-family house. As a positive side effect the living conditions have been greatly improved. Many similar examples are presented in ongoing work of the IEA SHC Task 37, which both VTT and Segel AS are participating.
About half of a total of 1.1 million Danish detached single-family houses were erected in the 1960/70’s, so applying the same renovation technologies to that part of the building stock would offer big possibilities for energy saving on one hand, and renovation service business on the other hand. Also in Finland there is a typical single-family house, the so called Veteran house, which was a largely applied building concept after the second world war, in 1940’s and 50’s. Similar groups of typical single-family houses can be identified in all the participating countries, where standard technical solutions and new service concepts can be developed.