FIELD: laying of rolled roofing on roofs of apartment houses, public and industrial buildings. SUBSTANCE: invention refers to ventilation blocks with length exceeding 1000 mm. Fitting for attachment of hydraulic insulation layers to ventilation blocks includes inclined layer of light concrete with hydraulic insulation layers bonded on to inclined surface of light concrete layer anchored together with protective apron by means of clamp, bolts and nuts on to ventilation blocks. Clamps are made of longitudinal strips with length equal to that of block with ends bent through 90 deg having holes which match holes in longitudinal strips. Metal bolts are put into holes drilled along longitudinal side of block through its entire thickness and into holes of longitudinal strips. EFFECT: improved quality of attachment, increased functional reliability of fitting in process of its usage. 1 dwg
