The XRD and XRD/W installation bases are designed for flat roof windows. They make it possible to raise the window above the flat roof by 15cm. Bases reduce to a minimum time of the window installation on roofs where an upstand to raise the window is required (e.g. green or gravel roofs). The XRD/A base is intended for type F & type G windows and raises their installation pitch by 3°.
the extended element of the base, the so-called fin is used to connect the base and the roof waterproofing layer
in order to build a higher base, cut off a protruding part along the perimeter, the so-called fin and put bases on top of each other
XRD/A base is fitted directly under the window