Honestly, the safety angle is huge that nobody talks about. My old garage floor was a solid sheet of ice from snow melt off the car. I nearly ate it twice just walking to the freezer. Now with the heat on, it's dry instantly. No more salt tracking into the house either, which saves my floors. It's a game changer for just not slipping and breaking your tailbone.

My cousin in St. Albert had that exact problem with his spray foamed roof deck. The foam sealed it up so tight that moisture from the house got trapped against the cold wood in winter. He found mold spots on the north side sheathing after two years. You need a really good vapor barrier on the warm side, and even then, I'm not convinced it's enough for our climate. That 30% savings might cost you a new roof down the line if the sheathing rots out.

Frank only loses two thou on an edge finder? He must have the steadiest hands in the state. Mine wanders more than that on a good day. The 1-2-3 block is a good fix, but I'd still check it with an indicator sweep. You can't trust anything that doesn't involve watching a needle move.

Guess they're leaving 30 percent for wishful thinking and bad math. What's your ideal number, Keith?

My buddy had a water stain on his ceiling that looked exactly like his old dog's face. He refused to fix the leak for a year.