woodsmith
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If the wall is very irregular then you may be better off fixing timber the full height of the wall plus trellis. That way you can put a frame fixer in where the timber touches the stone. If you just want to use short lengths of wood then the best method to make a secure fixing to soft stone is with styrene free resin anchor. With this you drill holes in the wall, blow the dust out, inject resin into the hole and then push a short length of threaded rod into the resin. Once set, which is very quick, the rod is fixed for good, even on relatively soft stone and you can then bolt the timber to the wall using the rods.
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