Discussion Starter · #1 ·
Electricians have been installing can lights throughout the house. When the sheetrock comes down there is a black charcoal/soot like material on the top of it. It does smear off and has 'flaky' type layering to it. It's been on every piece that has come down from various parts of the house. Electrician said the ceiling has double sheetrock. The insulation that comes down as well is not discolored and appears normal. Any idea what this is?