Can I use an Impact WRENCH on lag screws?

Absolutely you can use an impact wrench to drive lag screws. You can adjust the torque on any quality air impact wrench to avoid over tightening or stripping the wood.

Impact Lag

I have a 900 ft/lbs Ingersoll Rand that I bought used at a yard sale for $100. It's been a great purchase. I've used it alot, but unlike you I'm not a professional who uses it all day. It looks and feels indestructible. One thing I've found is that the diameter of the air hose makes a huge difference. I originally had a 125 psi tank with a cheap little hose and thought the gun was the problem. Once I bought a good 3/8" hose I could get any nut loose! I'd look for a good used one like mine, wear it out and save your money until you can buy a Proto, Mac or Snap On. My advise is if one of the pros on this forum doesn't answer, just drop by an auto shop and ask a professional. Any mechanic i know is happy to talk tools for a few minutes, and it might just get you a good contact for a job.

Sure, you can use an impact wrench it works very well. I'd use one every time except for the fact that I don't own one. I built a deck for a mechanic friend of mine, he had an impact wrench that I used to fasten the lag bolts. As I said, "it works very well."

I'm surprised you didn't try using it.

Yes you can use an impact wrench. It's a little bulky but will work just fine.

Impact driver on wood screws = very bad idea.

You'll damage the wood and the screw won't hold well.

Those treads will be trying to grip in 'battered' wood.

Pre-drill if it's too hard to drive a lag bolt manually.

no u gotta buy the cordless impact driver i think.......sorry

good luck

buy a cordless