Equipment required
Breathaplasta Universal
Clean water and brush or mister
Hawk, trowel and plastering tools
Recommended plaster thickness
Each coat should be up to 10 mm thick.
Up to 20mm max per day.
Up to 50mm max total thickness.
Coverage per 18kg Universal bag
Approx. 5 square metres at 4mm thickness
Setting time per coat
Approx. 45-60 minutes
Surface preparation
Dub out the wall to fill and level any hollows or depressions. Wall should be flat and even prior to plastering.
Mist the hempcrete surface with clean water approx. 2-3 times in the 10-15 mins before plastering to help control suction.
Key each coat with a crisscross diamond pattern to ensure a good bond between coats.
Recommended plaster application
Mix Universal to approx. 8 litres of cool, clean water per 18kg bag of dry powder used.
Mix the plaster using a paddle mix for at least 2 mins. Leave the mix to stand for 2 mins, then mix again for 1 min.
Base coat of Universal up to 10mm. This coat should be sprayed or cast on (thrown) to improve bond between plaster and substrate.
Second coat up to 10mm. Apply by trowel using firm and even pressure.
Finishing coat approx. 2-3mm.
Mist the surface of the finished plaster lightly and evenly across the whole surface, to help ensure the plaster cures well.
Bag calculator
Use this calculator to work out how many bags of Universal to order for your job.
Bags required:
