I have a six foot bag and the way I keep it up(!)is I have a heavy bag bracket(from Tao in the UK) which is much bigger/stronger than the cheap brackets you often find.I drilled 6 holes into the wall approx half to three quarter inch each WIDE and then used expanding wall bolts to hold it in place(available from hardware shop)drilled to about 3 inches deep that works fine for me.
My instructor uses a much larger bag than I do (each to their own) much heavier.He drilled all the way thru the wall and out other side,then he used the same type of bracket as I use and due to the size used large metal plates over the thread part of the 6 bolts going thru the wall and then bolted on the nuts.So it goes bolt,bracket,wall,metal washer/plate,nut.
He is an engineer and uses the washer/plates to spread the weight load rather than take a chance of the bolts tearing out the wall due to the weight of the bag..the weight of the bag is pulling on a much larger area than otherwise..
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Last edited by Tone C; 04-26-2006 at 02:32 AM.