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.
Apparently, the pipe vent collects rain and dew water. One of the pipe connector is loose, that cause leaking on my ceiling. Can you explain why the pipe vent should go out of the roof to collect the rain and dew water? What will it happen if there is no pipe vent out of the roof?