Hey folks! I need some advice regarding the concrete driveway my contractor is working on in Minneapolis. They have put down rebar and plan to pour the concrete tomorrow, but I have some concerns that I want to address first since I'm not exactly experienced with paving. Here are the issues I'm noticing:
1. **Geotextile Fabric**: Initially, I asked if they would install a geotextile fabric under the base to minimize potholes and gravel migration. They said no, and while I could add it myself, it would only go on top of the base layer. I've read that the fabric should actually go underneath; was I misinformed, or is this a red flag?
2. **Compaction**: I noticed on my Ring camera that they only compacted the 4" base layer once. From my knowledge, proper compaction usually requires 3-4 passes. Is one pass typically enough to ensure stability?
3. **Class 5 Base**: The contract states they would use class five base and compact it, but after looking at the base they've set down, I can see some pretty large rocks, with one measuring almost 3.5". Should that still be considered class 5 material?
I might not be fully understanding everything, so please let me know if I'm wrong. If my concerns are valid, how should I address these issues with the contractor before they pour? Should I halt the job until I get some answers or trust that everything is okay? Thanks for your help!
2 Answers
The rebar spacing matters, so make sure to check on that. If it's spaced well and set properly, that'll help with the slab’s integrity. A 3.5" rock is technically outside class 5 spec, but if they’ve ensured a level, compacted surface, you shouldn’t have issues with it. Just evaluate the feel of the base; if it's solid under your weight, you're likely okay!
Don't stress too much about the geotextile fabric for a residential driveway—it's often not necessary unless your soil has specific drainage or stability issues. For compaction, it really depends on how they laid the gravel. If they used equipment like a skid steer and dragged it properly, that might suffice. Walk over the base; if it feels solid, you should be good.
As for the rocks, a few oversize ones in class 5 aren’t a huge deal as long as they achieve a flat and compact surface. Just ensure you’re getting a level base!
Exactly! Just check for solidness. That’s the best indicator of if they did their job right.
Good point! Just make sure the rebar isn't too far apart either; that could affect everything.