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One option to consider is adding a heating wire to each pipe, perhaps extending into the bottom of the downspout. That way water can flow away and not over the sidewalk. The heater does not need to operate 24x7. A thermo control could engage it at a suitable range of pipe temperatures (or representative air temperatures). Perhaps from 20–31 °F ...


In my opinion you should be good as it was for depth, moving to Sch 40 is a good upgrade, that is what the company I worked for always used under slabs and especially driveways. The main thing is that there are no low areas for water to collect and freeze. Depending on your area, it would be a hard freeze to get ground to freeze at the 12" depth, there ...

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