What do I do when using tape alone where mastic/spec requires more?
Sealing, Leakage, Mastic & Pressure Testing.1 field-polished — seal/test detail check
If the spec or foreman calls for mastic/fabric/listed product, tape alone is not a substitute.
Field checklist
- Ask what method applies to that system.
- Check label/listing on the tape or sealant.
- Remove wrong material if directed.
- Apply approved method to the cleaned joint.
- Document if wrong material was already used by another crew.
Ask foreman
This joint was taped, but I think the spec calls for mastic or another seal method. Do you want it corrected before cover/test?
Do not
Do not assume tape alone passes because it looks neat.
Why it matters
A clean-looking taped joint can still be wrong for the system, pressure class, or inspection requirement.
Search words: seal leakage pressure test spec compliance