Q: How should I clean the slate in front of my house without damaging the mortar or grout? A: Marble and limestone are in one big group of natural stones, those made up mostly of calcium carbonate.

Q: I have a slate roof that is probably approaching 100 years old. I had one roofer tell me it is at the end of its life and should be replaced with asphalt. The cost to repair the area affected is $4 ...

A. Never, never use a roof rake or try to shovel snow off a slanted roof. It will do no good, will not cure ice dams, is extremely hazardous, and can harm asphalt shingles, and in your case, slate ...

Jon Hill stands at one of his company’s original quarries, which Greenstone has never used. Hill said the hole was probably dug around 1870 and that 500 men at a time worked in the pit removing slate.