The recommended gauge for a damp-proof membrane (DPM) typically depends on the material used.
Here's a breakdown:
- Polyethylene Sheet: A 1200 gauge (0.3mm) polyethylene sheet is generally considered suitable. As a minimum, a 1000 gauge (0.25mm) polyethylene sheet can be used if it meets specific technical requirements (e.g., Technical Requirement R3).
- Bitumen Sheet: If using a bitumen sheet, it should conform to BS 6398 standards.
Therefore, if using polyethylene sheeting, you'll generally want at least 1000 gauge and preferably 1200 gauge.
