(57) A roof substructure for roofs decked with roof decking boards is made up, in the
case of a couple roof to be insulated, of an exposed panel work (4) attached to the
rafters (6); a film-type vapour barrier (8) laid on the exposed panel work (4); an
insulating layer (10) based on mineral wool which is laid on the vapour barrier (8);
and a film (24) which is water repellent and is open to diffusion which is laid on
the insulating layer (10) and covers the latter. In this case, the insulating layer
(10) is made up of at least two types of strips (18, 22) which are laid alternately
individually and without gaps parallel to an edge of the roof, that is to say in a
steep-pitched couple roof to the ridge (16) and to the eaves (12), the one type of
strip (18) serving to absorb the roof load, introduced via base battens (20), of the
roof parts located above the insulating layer (10), and having a far higher compression
strength in relation to the other type of strip (22), serving purely insulating purposes,
and being of a many times narrower design compared to the other type of strip (22),
serving insulating purposes. In this case, the strips (18) for absorbing the load
have a compression strength of at least 50 kN/m2 and consist, like the strips (22) serving purely insulating purposes, solely of bonded
mineral wool.
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