Building a new deck - need rotary tool advice

Hey folks! I'm planning to build a 12x16 deck in my backyard this spring. I've got a circular saw and drill, but I keep hearing about rotary tools for detail work like cutting deck boards around posts and trimming. Should I invest in a Dremel or something heavier? I'm a weekend warrior, so I want to keep costs reasonable. Any recommendations?

I hear ya! I'm all about saving money. For deck work, a rotary tool with a good cut-off wheel is handy for small cuts, but honestly, for deck boards you might want a jigsaw or oscillating multi-tool. I've used my Dremel for sanding and engraving, not so much for heavy cutting. You might get more bang for your buck with an oscillating tool. But if you're set on a rotary, check out the Dremel 4300 - it has a flex shaft and variable speed, which is nice for detail work.

I agree with Sarah. For a deck, a rotary tool is not the first thing I'd grab. They're great for sanding tight spots, but for cutting PT lumber, you need something with more power. I'd recommend a good jigsaw with a carbide blade for cutting around posts. Or if you want to cut multiple boards at once, a circular saw is your friend. I've seen people use rotary tools to carve out notches, but that's tedious. Save your money for a quality jigsaw.

Solid advice from Sarah and Chris. As a contractor, I always have a rotary tool in my truck, but it's for plumbing and electrical, not deck building. The challenge with rotary tools is they are not meant for aggressive cuts in wood. The bits can overheat and the tool gets bogged down. For your project, I'd suggest an oscillating multi-tool with a woodcutting blade - it gets into corners and does plunge cuts easily. Also, don't forget to get a good carbide-tipped blade for your circular saw. And if you do get a rotary, get one with a flex shaft, it's handy for detailed sanding on railings.

Great, thanks everyone! I think I'll pass on the rotary for now and invest in an oscillating multi-tool. My wife also wants some built-in benches, so I'll need to do some flush cuts - that should work. I might still grab a rotary later for small projects. Appreciate the help! Any particular brand for the multi-tool?