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DIY people... I need to make a couple more ventilation holes in the wall....one 5" and another 8". What's the easiest way to do this? It's a plasterboard wall, insulation, more plasterboard, then wooden cladding on the outside, so I can't jigsaw a hole (and I don't have a jigsaw!).

[herby]

If you have to go through wooden cladding you will need a jigsaw for an 8" hole. If you just want to do a 4" hole you can get a hole saw for your drill and go through it with that. The sheetrock as well.

[FastForward]

Originally Posted by herby

If you have to go through wooden cladding you will need a jigsaw for an 8" hole. If you just want to do a 4" hole you can get a hole saw for your drill and go through it with that. The sheetrock as well.

Thanks...will see if I can get one tomorrow. I guess 4 x 4" close together will have to be good enough. The 6" one will probably stay a 5"...easier..

[s4m]

the first part of the wall take a serated blade to it "bread knife". Outside wood try useing a drill to bore series of holes round the diameter.

s4m.

[DR. nick]

interesting i was wondering how people did bigger tham the 4 inch hole...

s4m- your method sounds interesting please explain a bit more if you dont mind

[leadplant]

s4m is on the right track.
drill a hole in the sheetrock
and then carve out a 4" hole
with any serrated thin knife.
be careful to avoid over pulverising
the sheetrock or you will have a 6 inch
hole.

For the wood, a skillsaw can sort of
make do if you dont have a jigsaw
by making a series of cuts across the hole
like a star pattern.
Otherwise drill a bunch of holes like s4m said.
The 4 inch hole saw would work great but theyre quite
expensive. Make sure there are no wires or pipes
in the way.