Hammer Drills vs. Rotary Hammers (SDS)

What technique prevents 'spalling' (blow-out) on the back side of a brick or concrete wall when drilling through-holes?

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 Correct IncorrectDrill a small pilot hole completely through first, or switch off hammer mode and reduce forward pushing pressure just as the bit reaches the exit surface.

What technique prevents 'spalling' (blow-out) on the back side of a brick or concrete wall when drilling through-holes?

• Spray cold water onto the back brick face
• Push with all your body weight on the trigger
• Drill from the top down only
• Ease forward feed pressure and switch off hammer action just before punching through the back face