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With 12.5 you can score and snap it but if your butting the sheets then it can be problematic as you can end up with gaps and defeat the point of paying all that money for the wediboard.
I usually ping a chalk-line and then cut it with an older slightly blunt handsaw, but I'm pretty good at cutting a straight line.
You can use a circular saw or even a plunge saw but bear in mind you need to set your depth accurately, also remember that the top layer of the board is covered in silicates therefore it will dull your blade relatively quickly and dust is a problem as silica it ain't too good for you (COPD isn't nice).
I'm assuming that you want to board out the framing you put up. To do this I would:
Fix the board to the front of the frame.
Using the left side of the frame as a guide run a handsaw (you will need to "nose" the saw through the material or start it off with a padsaw / multitool)
Use the offcut on the return by offering it up and marking the depth then cutting it. But when fixing, fix it so that the factory edge is on the outside giving an arrow straight corner
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Bobbo
Dramatic_Hammer
That’s reassuring I suppose!
On the subject of wediboard, I have a 2600 x 1200 x 12.5 panel I need to make long straight cuts on with minimal waste... What’s the best way? I was thinking carbide scoring knife along a long spirit level but I’m not sure how neat that will end up. I’ve seen youtubers using craft knives and handheld circular saws (which I have) but I’m not convinced I can keep the line straight for the full length of the board (and also not fuck up the floor underneath).