Tim
We did a small Sun room rot repair job today, and the star attraction was Boral! It was the first time we used and it went pretty easy. We had to make outside corners which we used butt joints, glued with PL premium, and shot together with gun driven 8d ss ring shank nails. You can nail very close to the edge without blowout. We used normal carbide blades in the miter saws and the tablesaw.
The edges need to be sanded even when using fine blades. When sanding the edges I used my Ro90 on ro mode with 120 it sanded very nice. You'd be tempted to use rotex mode but it doesn't leave the edge straight or smooth. I had the vac on full and it didn't get all the dust.The dust is very fine like baby powder and covered all the saws even with dc. The cut edges are easy to damage so sanding or routing are a good option.
You don't have to prime the cuts like you do with our crappy wood we have today. You aren't limited with paint colors like Azek. You can't paint Azek dark colors. We needed to paint the repaired pieces dark green which isn't a problem with Boral. The Boral is heavy in weight but lays flat on the wall unlike Azek which follows every little bump or valley. It was close to 90 today and we worked in full sun all day with the pieces of Boral sitting on the grass in the sun. They weren't hot to the touch where as the Azek trim pcs were very hot to the touch.
The Boral is available at least for us in 1x4 to 1x12 and 5/4x4 to 5/4x12 , 2xs will be available soon, no sheet stock, and no mouldings yet. Apparently a third party is going to be manufacturing the moulding according to our lumberyard rep. The pricing is 15 to 20 percent cheaper than Azek and you don't have vacuum the lawn to remove the snow pile left over when using Azek. We are doing another repair job tomorrow where we will be making some thick window sills out of Boral and I will let you know how it went.
Here endth the lesson!
Cheers
Curt