c/concrete-finishers

Showerthought: that 1200 square foot slab pour in the rain last Thursday was the worst day I've had in a long time.

Watching the crew pour the new plaza in Cincinnati, I noticed they were using a garden sprayer filled with water to lightly mist the edges before the final trowel pass.

The foreman told me it buys you about 10 extra minutes of workable time on a hot day before the skin sets, which is a solid trick for those big, exposed slab edges.

Can we talk about guys skipping the magnesium float step on interior slabs?

I keep seeing crews in Phoenix go straight from the bull float to the trowel, especially on garage floors. That extra pass with the mag really helps close up the surface and stops that dusty top layer from forming later. I learned that from a foreman named Ray about five years ago and it's saved me a ton of callbacks for surface scaling. Anyone else notice this or am I just being picky?

I thought those new fiberglass trowels were just a gimmick

My supplier in Tacoma kept pushing them last year, saying they were lighter and didn't rust. I finally bought a 14 inch one after my old steel trowel handle snapped. Used it on a garage floor pour last month, and the difference in my wrist by the end of the day was huge. It felt like I had worked two hours less. Has anyone else switched over and noticed a real change in fatigue, or did I just get lucky?

Question about using a magnesium float on a hot day

I was finishing a driveway in Phoenix last week, and the crew kept going straight from the bull float to the steel trowel. The mix was setting up fast in the heat, and they were closing up the surface way too early. I pulled out my old magnesium float for a pass in between, and it made the cream come up perfect without sealing it. The boss said he hasn't used one in years because it's 'an extra step'. How do you guys handle timing on hot pours? Do you skip the mag float?

I found out the original Hoover Dam mix used a 1:2.25:2.5 ratio from a documentary

That's way less cement than I would've guessed for a project that size. Who else has run into a spec that made them double-check their own methods?

Unpopular opinion: I think a little dish soap in the wash water helps more than it hurts.

On a hot pour for a patio in Tucson last month, I added a small squirt of Dawn to my bucket of water for cleaning tools. I figured it would cut the grease and grime faster. The surprise was how it made the final broom finish go on smoother with less sticking. I learned that a tiny bit can act like a mild release agent without hurting the cure. Has anyone else tried this, or is it a bad idea for certain mixes?

Rant: A guy on a job in Fresno said you should never use a power trowel on a garage floor

We were finishing a big garage slab last summer, and this older finisher from another crew walked over. He pointed at my power trowel and said, 'You'll ruin the finish with that thing, hand tools only for a smooth surface.' I kept using it anyway and got a perfect, flat finish in half the time. He just shook his head and walked off. Anyone else run into this kind of old-school resistance to power tools?

Shoutout to the crew on that huge Phoenix pour last spring

We were finishing a massive warehouse floor, about 10,000 square feet, and the boss brought in a new guy to run the power trowel. He kept the blades way too high on the first pass, just skimming. An older finisher from another crew, Frank, walked over, adjusted them down a quarter inch, and said, 'You're just polishing air, kid. Let the machine do the work.' That one move saved us hours of rework. Anyone have a different trick for setting blade height on a first burn?

TIL my bull float technique was actually making the surface worse

I was finishing a garage slab in Tempe last week, and the homeowner pointed out these weird, shallow dips in the surface after I'd left. I went back and watched a guy on YouTube who said pushing the float instead of pulling it can trap bleed water underneath (which makes sense now). I've been pushing for like five years, thinking it gave me more control. Has anyone else had to unlearn a basic move like that?

My old boss told me to never use a magnesium float on a garage floor

He said it would always leave marks and a steel float was the only way to go. I listened for years, until a job last fall in Tacoma where the mix was setting up way too fast. Out of desperation, I grabbed my mag float and it worked perfectly, no marks at all. The trick was keeping it super clean and using a light touch. I've used it on three garage floors since with zero issues. What's one piece of old-school advice you guys ended up tossing out?

Pro tip: check your float trowel edges before a big pour

Lost about three hours and maybe $400 on a garage floor job because I didn't. The edge on my magnesium float had a tiny, almost invisible burr from hitting a rock on the last pour. It left these faint lines across the whole slab that I had to go back and hand trowel out. The homeowner was cool about it, but it ate up my whole afternoon. Now I run my thumb along the edge before I even load up the truck. Anyone else have a simple check they do to avoid a stupid mistake?

PSA: My bull float handle snapped on a 40-yard slab pour in Tucson last month

It was a cheap aluminum one from a big box store, and it broke right at the collar when I put some pressure on it. What's a more durable brand you guys trust for bigger jobs?

Warning: a bad pour on a 20x30 slab in Phoenix last week took us 14 hours to fix the surface.

The mix was too wet from the plant, and we had to fight it with extra dry shake and a magnesium float for what felt like forever, so always double-check that slump before they leave the site, right?

Appreciation post: saw a 100 year old sidewalk in Savannah that's still perfect

I was down in Savannah, Georgia last week for a family thing and I couldn't stop looking at the sidewalks. There's this one stretch near Forsyth Park that's gotta be original, maybe from the 1920s. The joints are tight, the surface is smooth, and there's hardly a crack in it. No heaving, no spalling, nothing. It made me think about the mix they used back then and how they placed it without any of our modern tools. What's the oldest pour you've seen that's still holding up? Makes you respect the guys who did it with just trowels and a lot of skill.

My old bull float gave out on me right in the middle of a big garage pour

The handle snapped clean off about two hours into the job last Tuesday. I was working on a 24x24 slab out in the county, and it just went. Had to send my helper to the nearest supply house, which was a 45 minute round trip. We kept the edge wet with a sprayer while he was gone, but I was sweating it. Anyone have a good brand for a replacement that can take a beating?

That time a 90 degree day in Phoenix made me swear off adding water to the mix on site

I was finishing a driveway and the crew kept adding water from a hose to 'keep it workable' in the heat. It set up way too fast and we got a ton of surface cracks (like spiderwebs, you know). Anyone else have a hard rule about water after the truck leaves?

I finally listened to my old boss about the bull float

He told me years ago to never use a magnesium float on a hot day in Phoenix, always stick with aluminum. I thought he was just set in his ways, so I ignored him on a 105 degree job last month. The magnesium one got so hot it started to stick and tear the surface, and I had to rework a whole section. What's the best tool you guys reach for when the sun is just baking the slab?

The week we poured a patio for a guy who insisted his dog was the 'foreman'

A foreman in Tacoma said my bull float technique was 'stirring soup' and it clicked

He told me to slow down and let the tool do the work, which fixed my pitting issues on a 40 yard slab. Anyone else get a piece of advice that just instantly made sense?

I finally hit 100 yards of broom finish in a single day

It was on a big warehouse slab in Kansas City last week, just me and one other guy. We started at 5 AM and finished the final pass at 7 PM. I always thought 80 yards was the max a two-man crew could handle without the concrete setting up too fast. The key was having the driver place it in perfect 10-foot strips, so we could stay right on the edge of the pour. That pace is not something I'd want to do every day, but it proved we could push harder than I thought. Has anyone else pulled off a number like that with a small crew?

That fancy new magnesium float cracked on me during a pour in Phoenix last Tuesday

We were finishing a 30 yard driveway slab, about three hours into the job. I went to make a pass and heard a loud snap. The handle had cracked right at the blade connection, leaving a sharp piece of metal sticking out. I had to stop everything, grab my backup aluminum float, and finish the section by hand. Has anyone else had a magnesium tool fail like that under normal heat? I thought they were supposed to be tough.

I used to think those $400 magnesium floats were a total gimmick until I borrowed one on a big slab pour in Dallas

Back in '08, I thought those laser screeds were just a gimmick for big crews.

A foreman in Tampa finally made me run one on a 12,000 sq ft slab. The floor was dead flat and we saved half a day. Anyone else have a tool they were wrong about at first?

First time I got a whole driveway to look like glass

Three years ago on a job in Mesa, I messed up a small patio so bad it looked like waves. Last month, I practiced on my own garage slab every weekend. Last week, I finally got a whole driveway pour to come out smooth as a mirror, no marks at all. Anyone else remember their first perfect finish?