An Ordnance Survey cut mark in the UK. The term bench mark, or benchmark, originates from the chiseled horizontal marks that surveyors made in stone structures, into which an angle-iron could be placed to form a bench for a leveling rod, thus ensuring that a leveling rod could be accurately repositioned in the same place in the future.
The forces that cause windows to leak fall into three categories: house design, installation, and maintenance. Turning to the wisdom of industry experts, we can identify nine of the most common errors that occur during window installations, which can lead to window leaks â and now you can too.
Water leaks from window frame (not the window itself, but the moulding around it) during heavy rain, and the wall below the window is showing dampness. It is a second floor window in the center rear of the house. During the last storm I checked that the gutter was not overflowing and there were no obvious cracks or openings around the window.