How do I cut a 7.25 inch hole through a wall?

Pete · 2006-02-13T15:54:38+00:00

Hi.Does anyone know of a good way to cut a 7.25 inch (185 mm) circularhole through a wall?I have attempted to hire a hole cutter but they seem to stop at 6",which is definitely too small.The depth and nature of the wall is an additional problem. It is about12" thick, and is made up of two 4" rows of breeze blocks with aninsulation-filled cavity between them. The breeze blocks are faced withmasonry on the outer wall, and plaster on the inner wall.Drilling a circle of holes and knocking out the core would, I imagine,be pretty tricky in terms of lining up the drill holes given the depthof the wall. It would also be time consuming, and the end result wouldbe ragged.Any suggestions for better methods would be welcome - particularly ifsomeone knows where I might hire a hole cutter big enough to do thejob! (I live near Norwich, just in case anyone knows anwhere local tome.)Thanks.