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It is not advisable to use salt on your roof to prevent or remove ice dams. It’s not only mostly ineffective but can also cause serious damage to your roof itself. Salt can rust metal, damage masonry, pit shingles, and cause runoff that’s damaging to plants and animals. 

Costs depend on property size, snowfall frequency, and additional services like de-icing or hauling snow offsite.

If you’re struggling to find anything else suitable in your cupboards, a vinegar and water ice melt makes for a passable quick fix. Just don’t expect it to clear your concrete the way commercial products or rock salt will. Mix equal parts vinegar and warm water and squeegee away the watery slush to prevent more slippery surfaces from forming.

When starting the engine, you typically leave the choke on a snowblower in the "choke" or "closed" position. After starting, let the engine run for a few minutes to warm up. Then, gradually open the choke, moving it to the "open" or "run" position, allowing more air into the engine and transitioning to a normal fuel-air mixture. The exact duration varies based on the snowblower model and ambient temperature, but as a general rule, you should open the choke once the engine has stabilized and runs smoothly, typically within a few minutes.