drilling into masonry

[novice1976]

Hi,

I am attaching a ledger board (for a deck) to a masonry wall. I have got M10 anchor bolts, and on the packet they say that I shoudl be using 16mm drill.

I've tried this (with an SDS drill) - but the hole is just too tight for the fitting and trying to expand the hole with the drill bit doesn't work. I can't hammer the anchor in, because it wrecks the thread on the bolt. Should I just use a bigger drill bit? Any suggestions would be great.

Thanks

 

[Al-Glasgow]

Wiggle the drill to open slightly

 

[cheltonian]

Drill through the timber with an 18mm flat bit first

 

[Belle427]

also put the nut on to hammer in