The frame construction/loft construction is a prefabricated, non-assembled frame construction, which is assembled at the building site. Use is made of part of the old construction by way of co-support. By passing the underchord through the existing roof and building the new roof above one obtains a tight roof during the entire construction period. The construction provides freely suspended floors and freely suspended attics which can be located as required. The method is characterized in that one cuts a recess into the sides of the old roof trusses at both sides of the roof, whereupon the subchords/beams are drawn through and assembled with the existing subchord. The footpoint is specially adapted so that when the spars are mounted the old head and roof gutter is used. When the new roof is tight the old roof is removed up to the support walls. With long spans iron girders can be drawn through the subchords.
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