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1.1.3 Modular Construction

The document discusses the use of light steel framing in modular construction, highlighting its cost-effectiveness for large production runs. It explains two construction methods, 'platform' and 'balloon', detailing their structural differences and advantages. Additionally, it describes the material properties of galvanized strip steel used in light steel framing, including grades and coating specifications.

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34 views1 page

1.1.3 Modular Construction

The document discusses the use of light steel framing in modular construction, highlighting its cost-effectiveness for large production runs. It explains two construction methods, 'platform' and 'balloon', detailing their structural differences and advantages. Additionally, it describes the material properties of galvanized strip steel used in light steel framing, including grades and coating specifications.

Uploaded by

msaludes78
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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SCI P301: Building Design using Cold Formed Steel Sections: Light Steel Framing in Residential Construction

Figure 1.6 Modular construction using light steel framing.

Modular construction is most cost-effective where large production runs are


possible for the same basic configuration of modular unit. This is because
prototyping and set-up costs, which are essentially independent of scale, can
be shared across many units.

A complementary SCI publication Modular construction using light steel


[1]
framing: Design of residential buildings addresses the use of modular
construction in residential construction.

1.1.4 Platform and ‘balloon’ construction


‘Stick-build’ or panel components may be assembled in either ‘platform’ or
‘balloon’ construction, as illustrated in Figure 1.7. In platform construction,
walls and floors are built sequentially one level at a time, so the walls are not
structurally continuous. In some forms of construction, loads from the walls
above are transferred through the floor joists to the wall below.

In ‘balloon’ construction, the wall panels are often much larger and are
continuous over more than one storey. Such panels are more difficult to erect
than single storey height panels and have to be temporarily braced whilst the
floors are installed. The main advantage of this approach is that loads from the
walls above are transferred directly to those below.

In both forms of construction, the external cladding or finishes are generally


installed and attached to the frames on-site.

1.1.5 Material properties


The galvanized strip steel, from which the light steel framing is formed, is
[2]
usually designated as either grade S280GD or grade S350GD to BS EN 10147
(formerly Fe E 280 G or Fe E 350 G). These designations indicate the yield
2
strength (280 or 350 N/mm ) and that the material is galvanized with a
minimum G275 coating. Cold formed steel sections are usually rolled from
galvanized sheet steel that is typically 0.9 to 3.2 mm thick. The normal
2
thickness of zinc coating (275 g/m ) has excellent durability for internal
applications. Heavier coatings are available for more aggressive external
environments.

P:\CMP\Cmp653\P301\P301v01 for pdf.wpd 5 2 October 2001

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