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Early Cavity walls - c1920

Early Cavity walls - c1920. Elevation. DPC. Wall ties. This is a cavity wall in Stretcher Bond. It is made from two leaves, or skins, of brickwork, each a half-brick thick. The internal leaf was usually built from common rather than facing brick. . Wall 250mm or 10 inches thick.

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Early Cavity walls - c1920

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  1. Early Cavity walls - c1920 Elevation DPC Wall ties This is a cavity wall in Stretcher Bond. It is made from two leaves, or skins, of brickwork, each a half-brick thick. The internal leaf was usually built from common rather than facing brick. Wall 250mm or 10 inches thick Next slide...

  2. Early Cavity walls - c1930 DPC Wall ties By the 1930s, some internal leaves were being built in block work. This was cheaper than brickwork. A standard block is 3 bricks high. Blocks were made from a variety of aggregates, some of them no longer available. Next slide...

  3. Cavity walls - c1960s and 1970s Lightweight blocks were originally made from lightweight aggregates such as clinker or pumice. These were slowly replaced with aerated concrete blocks such as Celcon and Thermalite. By the 1970s, or so, very little had changed. Cavity walls were still basically brickwork in the external leaf and block work in the internal leaf. However, lightweight blocks were becoming the norm to provide improved thermal insulation. Next slide...

  4. Modern cavity walls There are a number of ways in which modern ‘U’ Value requirements can be achieved (all use lightweight blocks)... Cavity boards Cavity batts Solid walls in lightweight blocks Thick lightweight blocks Internal insulation End

  5. Building up to D.P.C • Trench not wide enough. • Concrete strip foundation should be a minimum width of 600mm. • Allow plenty of room to work. Is this good building practice?

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