If the area you are concerned about has 2 different types of material can you send a sample of both in one kit? How big of samples are needed of each

You should always put one same per bag. If you send in two different samples there will be an extra $40.00 per additional sample. If it is Roofing sheet - 2 layers, Floor Tile - 2 layers or wall board - 2 layers this would be $80.00 extra per sample. The size of the sample collected should be 1" x 1" or 1 tablespoon of the sample using a razor knife, chisel or another tool capable of securing a sample of the entire matrix.