If using standing seam or concealed fix profiles, consult the maker about whether sealants should be used and, if so, how and where. When applying sealant to the leading edge of sheet overlaps, take care that the sealant does not exude under compression and thereby create a dam at the edge of the lap, which could trap water and dirt.
Cutting with a hacksaw leaves a rough edge. If cutting by saw is essential, use a jigsaw or circular saw with the appropriate metal cladding blade, taking care to ensure a clean cut. Control the cutting speed and ensure adequate cooling to prevent damage from overheating. The recommended method is to use a sheet nibbler, which gives a very clean edge and does not damage the sheet. This also makes it easy to cut complex holes through the sheet.