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Michael is Homebuilding & Renovating's Director of Content, Vice Chair of the self build industry body, the National Custom and Self Build Association ( NaCSBA), presenter of multiple property TV shows and author of Renovating for Profit(Ebury).He also runs an architectural and interior design practice, offering design and project management services. He is one of the country's leading property experts and has undertaken over 30 building projects including two self-builds and the renovation of a Grade-II listed farmhouse.
In this practical, I’ll be focusing on a few methods you can use to construct some of these prototypes. For best results, I’ll be using materials suitable for scribing; a harbour wall made from rigid insulation and plaster (with another using DAS air-drying clay), an ashlar arch and various rubble walls made from styrofoam, and finally, a dry stone wall made out of more air-drying clay. Please note; as the painting technique I’ll be using will be similar for every practical, I shall share this at the very end. WHAT YOU NEEDProviding the chalk is not too soft, foundation widths of 450mm for low-rise buildings are generally acceptable. The depth of the foundation must be below any frost action, a minimum of 700mm.
Tiny stones are glued along the top to reduce its ‘stepped’ nature; ahead of adding the capstones. The inset photograph shows one of three large clay ‘stones’ being roughened with a craft knife. Two of these are end stones (one visible on the bottom right of the main photograph), and the one left of the pliers would be used by people to hold onto while climbing over the stile.
Using rigid insulation and plaster
A reinforced suspended concrete floor slab, or a reinforced concrete ring beam, is then cast over the top of the piles, linking them all together so that the load of the Now use a flat needle file to create chamfered edges along the archway. With the styrofoam walls complete, apply a layer of gesso to everything. Gesso is an acrylic paste made from chalk, binder, and white pigment. It’s used as a primer to prepare surfaces for painting, but it also provides a little more strength and texture. Simply apply it with a brush, and leave it overnight to dry.
Water pipes must enter the building at a depth of at least 750mm but no more than 1.35m below ground. If that means that they pass through a concrete foundation then they must either be laid prior to pouring or, better still, a duct installed for them to be pushed through later.Clays with the highest plasticity (and so the highest risk) are generally found in the South East of England, stretching up through the East Midlands to the Humber in the North and down to Bath in the West
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