"Two coats of elastomeric" is not a specification. Two coats applied thin is half a membrane, and it will pass a visual inspection on handover day and fail in the second wet season.
What a real line item looks like
Specify the dry-film build in microns and the wet-film thickness per pass, then require a wet-film gauge on site. Coverage rate in m²/L is how you check the applicator drew the right quantity out of the store for the area covered — it is a control, not a target.
- State the dry-film build, not the coat count.
- Require reinforcing mesh at movement joints, drains and upturns — not across the whole field unless the deck moves.
- Upturns 150 mm minimum, terminated into a chase or under a flashing. A membrane that stops at the screed line will wick.
- Prime by substrate. Fibre cement, existing coatings and fresh concrete are three different primers.
Cold-applied or torch-on
APP torch-on sheet is excellent on large uninterrupted decks with a dry substrate and a hot-works permit. Where the deck is cut up with penetrations, plant bases and upstands, a liquid membrane details around them without a single lap to fail. On an occupied building where hot works are refused, that decision is made for you.
Written by the INTRIC technical desk. If this raised a question about your substrate, ask it — send the detail and you get an answer, not a sales call.