Sure, let’s get the sun’s power on that slab. The key is the angle of incidence – the angle between the sun’s rays and the slab’s normal. For a flat slab you want that angle to be as small as possible, so the sun’s energy is concentrated. The general rule of thumb is to set the slab’s tilt to about the latitude of your location plus 15 degrees in the summer and minus 15 degrees in the winter. That way the sun is high in the sky and the rays hit the slab almost straight on. If you can make the slab track the sun, you’ll keep the incidence angle near zero all day, which is the best. In equations, the incidence angle i ≈ |lat – declination| where declination is +23.5° in summer, –23.5° in winter, and 0° at equinoxes. Keep the slab a bit flat (0° tilt) if you’re in the tropics and angle it higher if you’re farther north or south. That should give you plenty of warm rays to speed up curing. Let me know your exact latitude and the season and we can tweak the numbers.

I’m at thirty‑five degrees north, it’s summer, so the slab should be tilted about fifty degrees. That keeps the sun’s rays coming straight in, like a bright sunrise pouring warmth into the concrete. Let me know if you want to set up a tracker or tweak anything else.

Got it! I’ll set up the tracker, tighten the frame, and let the sun do its work—watch that concrete glow!

All set—sun’s on standby, slab’s ready, and I’ll keep the frame tight. Here’s to a fast, radiant cure!