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The DHS ’ s goal is to deliver over 1.5 million housing opportunities by 2019 .
Minnaar cautions , however , that it is important for raft foundations to be constructed accurately .
“ If they are not , adjustments must be made either through larger or smaller vertical joints . Smaller joints can work without compromising the modular principle but larger joints tend to become even bigger at door and window openings and builders may be tempted to insert small pieces of blocks into the gaps . This is wasteful in terms of both time and materials and compromises structural integrity .”
In coastal areas where the hollow 390mm block is preferred for its better thermal and damp proofing properties , the working module , allowing for 10mm of mortar , is 400mm long by 140mm wide by 200mm high . This module does not enjoy the benefit found in the solid block ’ s 300mm module where the width of the block is half its length , and steps must be taken during corner construction to retain full modularity . This is either achieved using precast L-shaped corner blocks which require an additional mould , or more cost-effectively , using a smaller 340mm at the corners .
There are certain procedures which must be adhered to in both instances . For example , if one uses the 340mm block , the wall must always start with a 340mm block laid lengthwise or perpendicularly and end with a 340mm block , also laid either lengthwise or perpendicularly . These and other details are fully covered in the plans of the coastal house .
There is another important consideration in addition to the cornering details . Hollow 400mm blocks ( 390mm + 10mm mortar ) are based on 200mm modules , which are not compatible with the 300mm module of traditional imperial sized door and window frames . Cutting blocks to fill + -100mm gaps is not advised . What usually happens in this case is that blocks are hacked to size with a trowel , producing inaccurate fill-in pieces and massive amounts of waste .
The preferable solution is to source 200mm module door and window frames from CMA building material suppliers . They are available in either 800mm or 1 000mm widths and the choice of windows is vast ( 400 , 600 , 800mm and so on ).
“ Once the importance of module compatibility is better understood by designers and then specified , frame suppliers will quickly adapt . Getting structural engineers attuned to the significant benefits of modular construction is another challenge .
“ The CMA House provides a blueprint for the productive construction of sustainable , aestheticallypleasing and thermally efficient housing . It is a turnkey subsidy housing solution , which if followed in a disciplined manner , can be executed efficiently and profitably to the benefit of all participants ,” concludes Minnaar .
CONCRETE ROOF TILE EQUIPMENT USED WORLDWIDE SINCE 1985
THE ONLY EQUIPMENT MANUFACTURER IN THE SOUTHERN HEMISPHERE PRODUCING HIGH SPEED CONCRETE TILE EXTRUSION PLANTS
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SA HOUSING MARCH - APRIL 2017 13