Holes are made in brickwork walls for all kinds of reasons including gas flues, to route cabling and to fit windows. At some point that hole gets large enough that a lintel is required to support the brickwork above.
My questions are:
- My theory is that the height of the hole is not relevant as to whether additional support is required. The only important factor is the width of the hole. Is this correct?
- Is a circular or rectangular hole preferred?
- Does the type of construction i.e. cavity wall, double leaf solid wall, single leaf wall make a significant difference?
- What is the maximum width of the hole before additional support is required?