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plaster of clay - the third layer

We finished in June the third layer of plaster of clay inside.

We must then install the floor before the last and final layer of plaster, a lime plaster. Indeed, we hope that the plaster finishes on the floor and there is no molding on the ground, to make them look more modern home. This will involve protecting floors impeccably because lime stain the wood, which we have had the experience, since there was a little lime in the third layer of plaster ... And lime, although in tiny quantities, burning hands ... The gloves are a must! ;-)

In Plaster clay, clay used as binder to particles of sand that gives strength to the plaster. The plaster is composed of sand, straw (from switchgrass to be more precise, a straw that breaks up easily in the blender), clay and water. The last layer before coating with lime also contains lime, to facilitate the accession of the final coating.

coarse sand for the first and second layers

sand for the 3rd layer

switchgrass

In the first layer, the sand used is very coarse, it must contain grains of variable size, some up to 4 or 5 mm. This allows a thicker layer of plaster, a layer of about 2 to 3 cm. This sand is rather difficult to find, we finally found a company that manufactures concrete blocks.

In subsequent layers, the sand is refined and therefore the texture of the plaster on the wall too. The layers are thinner, but smoother. And techniques to make a mechanical grip on the plaster are becoming more sophisticated too.

The exact mix of various ingredients vary depending on the quality of the clay you have. Sylvie Please us greatly helped to determine the exact quantities to use to get a good recipe and also to organize to be effective on the job. Indeed, when we did the exterior plaster, we used the advice that we had gleaned here and there, but we made several errors that made us lose precious time and energy. First, we should use a mortar mixer (not concrete) rather than a drill press and seal. This allows for quantities of plaster much larger and provide a larger team of workers. Then we really do not put enough sand, which is found in greater quantity in the mix all other ingredients, which caused many cracks in our plaster and forced us to give a second layer ...

corners rounded edges of windows

For this third layer, we could begin to cover the window frames made of plywood plaster. First we sanded the corners, so that it is easier to round them off later, and we then covered with mortar to create mechanical grip for the plaster.


If you're thinking build a house of straw and you have any questions, please! And do not underestimate the time to do the plastering. If the walls of straw do you think long, you have not seen anything to the plaster! It takes a lot of time and patience ... and help!

Thanks also to David for coming to help us so often (I told you I would put a picture of you with pink gloves on the net, haha!) And thank you to Rene Ginette Richard, Nath and Juliet coming to help us finish this very long month!