The one-family detached house is designed following the PassivHaus principles. Assessment is done with PHPP from the Passivhaus Institute in Darmstad. The house is built according to the PEB with level A+. In this Belgium demo building we demonstrate the RS02 solar roof elements. The house has a roof and a facade facing SSW (about 10° from South). Although the building was still in the design phase during the start of the BFIRST project, the roof shape could not be optimized for the solar modules. This is due to local regulation. The architect (Format D2) made several proposals to the municipality to improve and enlarge the roof by creating overhangs. But the local municipality demanded for a symmetric roof without overhangs. As a result the height of the building was lowered and part of the volume at the first floor had to be moved to the ground floor. In this way an additional volume at the ground floor was designed.
In this specific case, the solar module dimensions are optimized for this house. In fact the development of the modules is done more or less without knowing the final shape of the roof. In a late stadium of the development of the project (month 24) it became clear what would be the final roof design. In here we will show the module design and the integration in the final building.
The very first roof module design was a sawtooth shaped module. The idea was to make this overlapping, like regular tiles. Overlapping in one direction (top to bottom) is rather easy and the connection can be made water-tight in a simple way. Overlapping in the other direction (left to right or the opposite direction) is more complicated. Wind pressure during storm and rain will push the rain water under the modules. So if we keep comparing this with tiles, we mostly see a special profiling at the edge of the tiles and not a flat profile like in this roof element. If we overlap also in horizontal direction we will face a problem in the corners where 4 modules are on top of each other. It will be difficult to close the gaps without a lot of foam (PUR). So the basic solution is to make an overlap from top to bottom and not from left to right but instead of that to use a hidden gutter or H-profile to connect the elements horizontally.
Mounting system and details
The basic idea is that the roof is not 100% water-tight but the under roof can take some water. Although that will be temporarily and not continuously. From top to the bottom the elements will overlap to form one large cover. From left to right a hidden gutter will be used to collect rainwater. To avoid to much rainwater being blown under the edges, the edges will have a compression foam to fill the gap.
To mount the roof elements to the roof structure an old and proven system will be used. The system is Alutec. The principle is quite simple as can be seen in the small pictures.
Monitoring results can be found at the Belgian demosite website.