Place permanent wedging under jambs and any mullions to ensure that the weight of the window element is supported by the underlying structure (A)
For windows with floating mullions, place wedging under jambs and floating mullion to ensure that the weight of the unit is supported by the underlying structure (A)
The sill must be horizontal and straight. It must under nu circumstances curve upwards or downwards. Place permanent wedging below the jamb at the hinge side of the unit (B). When securing, ensure that the point can absorb compressive forces.
Place permanent wedging at the top of the jamb on the hinge side of the unit (C). When securing, ensure that the point can absorb tensile forces.
Place permanent wedging above the jamb at the closing side of the unit (D); when securing, this wedging must ensure that the point can absorb compressive forces.
For a unit height of above 1600 mm, wedging on both sides at the top of the frame is required.
For increased security and strength a permanent packer can be placed behind ironmongery fix points and locking points.
Jambs should be perfectly plumb and square, and can under no circumstances bow.
During installation, the clearance, i.e. the space between the frame and sash, should be adjusted according to the function of the element. The closing side must be adjusted to provide a tight seal when closed.
The tolerance on diagonal measurements is ±2 mm.
Permanent wedging on the frame head may only be used if the load from any window/door elements above does not subject the unit to stress apart from at the jambs and mullions.