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Yes, you should screw your flange to the subfloor, including cement. The best way to get this done is to predrill holes into the concrete using a hammer drill and a ¼-inch concrete bit. Be careful when you’re ready to bolt your flange down, as you can accidentally crack it. You can avoid this issue by not installing the screws too deep. Or, you can opt for a flange with a stainless steel ring so you don’t have to worry about cracking the plastic.

Yes, you can pour concrete if it rained the day before, but you’ll need to drain the construction site to ensure there isn’t standing water where your slab will sit. You might need to manually remove any puddles and set up drainage on your site to dry it before pouring. Moist soil won’t be an issue, but standing water will throw off your concrete mix ratios. Additionally, ensure there isn’t more rain expected in the near future before you pour.

You should have at least 4 to 6 inches of compactable base under your concrete slab. Your contractor may recommend more depending on the structure.

If your channel drain is being installed in a driveway, then you will need to pour concrete to secure the drain and prevent it from breaking under the weight of your car. For channel drains that you plan on installing on a walkway or underneath a roof or awning, then you can get away with using a compacted fill.