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.
9 Causes of Leaky Windows. One of the main reasons to ensure your windows are watertight is to keep moisture out of the walls. Once inside your walls, moisture can cause rot, mold and pest problems. Keeping water at bay would be easier, of course, if our homes had no openings for doors and windows.
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?