- Report #: NT BUILD 336
- Approved: September 1988
This NORDTEST method specifies a test for puncturing under cumulative load. Mechanical stress on roofing varies from static long-term loads to dynamic short-term loads. This method represents an intermediate (semi-dynamic) load category.
For puncture by impact see NORDTEST method NT BUILD 335 “Roof coverings: Puncture by impact”.
2. FIELD OF APPLICATION
This method is intended to test resistance to puncture for roofing materials resting on a relatively soft underlay such as polystyrene or mineral wool. But it can also be used for testing the membrane itself, fixed between metal rings.
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