The way we work with a slate roof is simply to remove all the slate from the section of roof where the solar array will go, then tie in to the trusses/rafters with standoffs and either use a rolled asphalt surface or a rubber membrane to seal the portion of roof under the panels, then replace some of the slate around the edges so it's a seamless transition from slate to solar.

But at the end of the day, relying on a simple metrics leads to only having a surface level understanding.

However, If a piece of baseboard had a small amount of surface black mold, it wouldn't be unusual for a repairman to clean it, bleach it, and keep it. 

Just my two cents as contractor who specializes in cabinetry which inevitably causes me to deal with plumbing, electrical, and hard surfaces.

It's about 2,800 sq. ft. of surface that needs painting.

@Odie Ayaga , I think from the surface, following the crowd is never the way to go.

So here I am seeking advice once again as I’m barely scraping the surface in this business.

Base it on the exterior surface of the walls of the heated floor space.

Real Wood Veneer• It provides the beautiful and traditional aesthetic of a natural wood surface.

the new rent control law on the surface seems that it will discourage future investors from purchasing rentals.