EuBrew
Well-Known Member
It's certainly a risk but you would only need two per side... The odds are in your favor though. Many more square inches without tubing in the wall than with.
Isn't that akin to what golfers say, a tree is 90% air? If it's 90% air why do I hit that $&@!?
If you go this route put a stop on your bit at 1/8" and use a small screwdriver to dig out the insulation in your path through and you'll be fine. Worst case is you discover you indeed are too close to a line and you move your hole. It'd be covered by your wood anyway.