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.
This is a job for your HVAC specialist. Incorrectly Installed A/C Unit â If your unit is not level or if thereâs too much proessure, this could cause the valves to leak and water to pool. Blocked Drain Hole â One of the most common (and least costly) causes of a leaking air conditioner is a blocked drain hole.