Roof replacement

Building Type 1: 1850-1890

Many years of wear and tear on roof coverings, flashings, roof valleys, etc. mean that at some point a whole or partial replacement will be required. Since the lifespans of the aforementioned building parts and materials can be variable, a partial replacement of the roof covering will often be sufficient. In the case of partial repairs, the degraded materials are replaced and the structure is rebuilt according to the original.

In other cases where the roof erosion is widespread and there is a need for a total replacement, there is now a requirement that the roofing solution be improved e.g. by using a subroof solution that can extend the structure’s normal lifespan and even out some of the differences between the lifespans of other parts.  

If a long-lasting solution is required for the replacement roof covering, it is recommend that a permanent subroof and regulatory ventilation of the roof structure be introduced. A number of illustrated examples, showing how a roof structure can best be constructed to achieve good durability, are shown on the GODE TAGE | DK website. In addition, good advice on a selection of subroof solutions can be found on the DUKO | DK website.  

En nyere løsning ved udskiftning af skifertag, som endnu ikke er generelt anvendt, men som forventes at vinde mere og mere indpas, er uden lægtning, således at skifterpladerne sømmes direkte på det faste undertag – se foto til venstre.  

The BVB | DK website includes a number of general recommendations based on accumulated experience from publicly funded building renovation projects. In addition, see BYG-ERFA: Subroofs and roof structures  

Photos: BvB/Kristian Køje and sbs/Graves Simonsen (bottom)