Best Blade for Cutting Concrete with a 4.5″ Grinder?

You know, I've started renting a concrete saw for projects like this. Even though you have to factor in the rental cost and trips to Home Depot, it can be quicker and less hassle than using a grinder or hammer drill. Sometimes saving time is worth it!

A segmented diamond blade works wonders! If you can, set up a water hose to keep things cool and reduce dust—it makes a big difference. Just use a bit of water while you cut to keep the dust down and help the blade last longer. Slow and steady wins the race!

If you’re trying to save on tools, cut as deep as you can with the grinder, then bust out the rest using a demolition bit with a hammer drill or a demolition hammer. It's more effective for getting a clean cut without needing to buy or rent too many tools.

Definitely go for a segmented diamond coated masonry cutoff blade. Just make sure it’s rated for dry use. When you cut, apply light pressure and take it slow, making multiple shallow passes. And don't forget to wear a KN95 mask at a minimum—N99 is even better. Eye protection’s a must too, since cutting concrete creates lots of fine dust. It’s important to note that with a 4.5" grinder, you won’t get too deep; you might need to score it, break it with a hammer, and then clean up the edges with the grinder to finish.

You might also try scoring the concrete with the grinder and then chipping it off with a hammer and bolster. Alternatively, if you have an SDS drill, that can be a good option too. If you can stitch drill at the height you need, it’ll snap off more easily and keep the dust down better than the grinder.