How to Make a Plaster Slab

Plastering Books
by Plastering Books
This technique can be applied to any shape or design that you,
This and more plaster mouldings skills are available in step by step detail in Plasterwork Decorative Moulding. Available as eBook or paperback view the 5 star reviews for this book on this web site
The plaster slab This technique can be applied to any shape or design that you,
To cast a plaster slab we use the same techniques as when we cast a ceiling rose.
The timber bearers are secured into place Timber bearers for a plain faced cast should be at least 30mm x 30mm These will be the strike offs , the finished levels for the plaster slab Using the pre cut and pre greased timber laths and a builders' square check for accuracy prior to screwing to the bench
To prevent the plaster slab from sticking to the bench , it is coated with a layer of vegetable oil and allowed to dry.
Once the plaster has been mixed to a creamy consistency the firstings are poured into the centre of the cast and allowed to disperse
When the firstings have started to set it is time to install the reinforcement For this we are using timber laths that have been pre soaked for up to 24 hours The reason for the pre soak is to allow for the timber to swell twist and warp. The timber laths are laid parallel to the strike off Canvas hessian is cut to size and used to provide strength to the slab
The seconds are mixed and spread with a joint rule over the timber laths. The strike off points are kept level to the timber fence.
Once the strike off are filled level, they are cleaned off with clean water. A light splash of plaster onto canvas hessian to secure it into place
Once the plaster slab has set and all the heat died off it is time to remove the timber bearers
The completed plaster slab. Any imperfections can be cleaned off with either a busk or joint rule. Then put in a safe dry location to dry before it can be installed
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