boat retrofits 7 daylighting some boats may already have these installed. We assume that each DIY solar tube system will cost an estimated 100 € and that an average of three will be installed per boat, totalling 300 €. We estimate the installation of these solar tube systems to total 20 hours. 8 ecosystem We recommend that the roof be reinforced during the installation of insulation. The insulation frame can also be extended above the boat to create an added support structure for a green roof. COST & LABOR ESTIMATES We estimate that a DIY green roof will cost roughly 10 € per square meter for materials, amounting to 750 € for a roof surface of 75 square meters. A conservative labor estimate is 80 hours for the installation. To reduce electricity demand for lighting, we also recommend the installation of skylights and suntubes at this stage whenever it is feasible. Retail suntube systems can be quite expensive (500 - 1.000 € a piece). DIY systems can be quite cheap by contrast, but require very careful installation to avoid any roof leakage and cold bridge formation. COST & LABOR ESTIMATES It is difficult to estimate how many solar tube installations will be appropriate per boat, since For a variety of reasons, we recommend that all rooſtops on the de Ceuvel site have a significant percentage of green roof cover. Green roofs bring benefits not only in terms of improved insulation, water retention, and roof durability, but also serve as an ecological habitat structure. The cost of a professionally installed green roof can be as high as 200 € per square meter. A DIY system can amount to a small fraction of the cost (e.g., 10 € per square meter). Care must be taken to ensure that the roof construction can bear the extra weight of the substrate, plants, and water. 46 / 146 Pagina 45
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