Soffit removed

Well it's back to covering the soffit again. The thin T&G material was simply wrong and has been removed. There was too much expansion and contraction which made it warp and bow a ridiculous amount. What a lesson.

Now, after some research, I've found a true soffit material -- Alside vinyl soffit. It's a complete system with thermal expansion totally factored in. I got their Charter Oak line, which is especially rigid and straight, designed to span 24 inches. The vent slots are invisible. Pieces snap together and hang on slotted holes. How perfect! They come 12 feet long. End conditions are supported by J channels.

They recommend installing perpendicular to the wall to reduce the need to rip-cut the length of the final piece if there's any skew in the installation. Sounds like a good idea. It also eliminates end seams in long soffits. As such I've installed 1x3 nailers across the rafters.