Suitable tape width depends on joint dimensions and the contact area required on each side. Roll length can be planned around the workload and application method.
Measure the joint
Measure the joint and surface geometry; determine overlap from product instructions and project requirements. Do not assume the narrowest tape is suitable simply because a joint is narrow.
Plan consumption
Estimate demand from total joint length, penetrations and application waste. Confirm available widths and lengths with the supplier before ordering.