Laying instructions for interior window sills
For the installation of window sills made of natural stone and artificial stone you need the following tools:
Trowel, folding rule, bucket, spirit level, silicone gun and a sponge.
As a laying material you also need:
Trass cement mortar and natural stone silicone. Both are available in every building materials trade from different suppliers.
Check the windowsill for possible defects before installation.
Measure the height difference between the window sill and the lower edge of the window frame.
From this you subtract the material thickness of the windowsill; the difference must then be filled with mortar.
- INSTALLATION OF THE WINDOW BANK
Mix the mortar with a little water; Do not use too much water so that the mortar does not get muddy consistency. Apply the mortar with the trowel at the previously measured height over the entire surface. Place the windowsill on the mortar bed and slide it under the window frame until it touches the stop profile.
If this is not convenient, lift the sill back out of the mortar and reduce the mortar thickness; or - if there is still room between the surface of the windowsill and the bottom edge of the window frame - apply a little more mortar.
Check with the spirit level in the longitudinal and transverse direction, whether the windowsill is just installed. Fill and smooth the joint below the windowsill with a little mortar.
Clean the surface and edges of the sill with clean water and dry the surface well. Seal the transitions of the windowsill to the side window soffits and the window frame with natural stone silicone. Clean the surface and edges of the sill with clean water and dry the surface well.
Seal the transitions of the windowsill to the side window soffits and the window frame with natural stone silicone.
Cover the windowsill with foil until construction is complete to prevent stains or scratches.
If you want to subsequently treat the windowsill with a stain impregnation or a color enhancer, this should only be done 2-3 weeks after installation, because during this time the moisture from the mortar bed must first evaporate through the stone.
- NO GOES when laying windowsills:
Do not use gypsum plaster such as red tape for laying; Any gypsum-containing agent is likely to cause discoloration in natural stone.
Do not use construction foam for laying.
Do not use acrylic or standard silicone to grout the windowsill.