Early Cavity walls - c1920 DPC Wall ties Next slide... Elevation

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Presentation transcript:

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

Early Cavity walls - c1930 DPC Wall ties Next slide... By the 1930s, or so, some internal leaves were being built in blockwork. 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...

Cavity walls - c1960s and 1970s Next slide... Lightweight blocks were originally made from lightweight aggregates such as clinker or pumice.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 blockwork in the internal leaf. However, lightweight blocks were becoming the norm to provide improved thermal insulation. Next slide...

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