Instead of guesstimating when your porch joists are adequately pitched to shed water, fasten FastCap’s How Far Out Gauge to your spirit level to get an accurate reading. This slick $50 accessory has 1/16-inch or 1mm increments laser-etched into the tool for accuracy, and is interchangeable between different levels (with extra connectors available separately).
No More ‘Half a Bubble Off Plumb’