PERMACON - Lafitt Tandem Wall - Chapter 2 - Building a retaining wall

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The structural units come in four different sizes. With each structural unit there is a veneer unit of the same length. The unit can be assembled using the dovetail joint (an interlocking male/female system). Each structural unit has two vertical tenons (male side) on its façade and each veneer unit has at least two mortises (female side) at its rear. The veneer units are joined to the structural units by simply sliding the mortises into the tenons to create the Tandem unit with a total depth of 222 mm (8 ¾ inches).

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