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.
Two reasons, if it is the rain (roof leak), then you will see it during the next rainfall. It could be, however, a pipe issue. Not all pipe issues are leaking pipes. I have seen many homeowners assume a pipe is leaking because the water spots are directly below a pipe.