I would like to shiplap the roof boards for my new workshop roof. This is approx 1200 sq ft of one inch softwood lumber. My reason for doing this is the fact that after I board in the roof I know there will be quite a bit of shrinkage and as the cracks open up I will be able to see up through them and the blue styrofoam insulation will be visible from the shop floor in these seams. I want to avoid this if possible and the only way I can think of is to ship lap the boards.
My question is what would be the best way to do this. I have three options with the tools I have.
Option 1: is a dado head on my table saw. I have a cheap dado set and I would not be worried about the roughness of the cut. Has anyone done this and if so waht are your thoughts?
Option 2 : Stack approx 4 skil saw blades on the table saw and use them in place of the dado head. I have not tried this out but some of these 7 1/4” cheap blades really zip through the wood. Thoughts??
Option 3: Use a hand or table mounted router. This would work but I don’t know if the router could stand all this heavy usage. Thoughts???