What is the effect of the roof pressure?
The windowsill is generally below the brick wall masonry easy to loose in order to prevent the brick off the top of a layer of concrete after pouring on the more solid like a parapet balcony and so have the same reason
Can prevent the external rain into the impact of the lower part of the wall strength.
When installing the window, the flat iron can be fixed on it, increasing the stability of the window.
Increase the integrity and stability of the lower wall of the windowsill.
As a common quality control, reduce or avoid the stress caused by the phenomenon of wall cracks
(In the two sides of the wall and the windows of the junction position was zigzag cracks).
