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Choosing a power saw for house building: A 185mm diameter blade on a portable circular saw with adjustable cutting depth and mitre angles up to 45° is fine for a small gable-roofed building with timbers up to 50mm deep. But a hipped-roof building will require many highly accurate mitre cuts, possibly higher than 45° bevels on hip jack rafters, and therefore a larger diameter than 185mm blade even if the timbers are still only 50mm deep.   kellyjones00 (593)

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Blades for power saws: - The blade with more teeth (e.g. >24T) cuts hardwood, or creates a smoother finish, or cuts across the grain. Less teeth are used for ripping and softwood. - Choose a blade with regular inlets cut between teeth to help dispel the build-up of heat, and prevent warping. Holes in the blade also do this. - While a basic "curling wave" tooth design is fine for softwood, a shallow V-cut in each tooth, like the valley of a cusp, is better for hardwood.   kellyjones00 (593)     Click to enlarge

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