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.
Damp and condensation can cause black mould to appear on your internal walls and window frames. In the majority of cases wall damp and mould problems can be dealt with pretty easily and can be caused by something quite obvious when you have pin-pointed the source of the moisture. typical Damp Proof Course â if this is faulty or missing it may be the cause of the damp and mould on your walls. As with the majority of materials, things degrade and break over time and this is also the case with DPCs. With a slate DPC, this can break and crack over a period of years and the same goes for felt DPCs.