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French Windows: Cill
An external cill is needed to aid the drainage of water out and away from the building to help protect the brickwork. The depth of cill needed will depend on how far back your window is set into the wall.
| A stub cill sits within the window cavity and is typically used when a cill is required to breach a gap between the new window and an existing structural cill. The stub cill can be placed to allow water to flow down on to the other surface that will drain the water away from the building. |
| The 150mm cill is the most popular option for windows set approx 25 mm back from the brick face. |
| A 180mm cill is typically used for windows that are set further back from the brick face, approx 50mm. |
If the window has a cill as part of the structure of the house, eg. a stone or brick cill, you may not require a cill as there may already be sufficient means of drainage in place.
