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Single-Storey Frames, Shells and Lightweight Coverings 223<br />

Profiled steel roof sheet with<br />

insulation and inner lining sheet<br />

Insulation placed between Zed<br />

purlins<br />

Gaps at junction must be sealed for<br />

airtightness<br />

Self-tapping screw with Neoprene seal<br />

Portal frame<br />

Wall sheeting insulation and inner lining<br />

sheet<br />

Drip flashing fixed to Zed purlins<br />

(sheeting rails)<br />

Steel cill<br />

Insulated cavity wall<br />

Reinforced concrete ground beam –<br />

carries cavity wall and ties pad<br />

foundations together<br />

Pad foundations transfer the point<br />

loads of the column<br />

Figure 4.58 Profiled steel wall sheeting for portal frame building.<br />

cement sheets are made with polypropylene reinforcement strips inserted along precisely<br />

engineered locations along the length of the sheet, which provides greater impact strength<br />

without affecting the durability of the product.<br />

Sheets are usually finished in a natural grey colour, especially when used for industrial<br />

and agricultural buildings, although a range of natural colours and painted finishes are also

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