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3.3 Timbering
Building and Construction · Grade 10 · 10 lessons in the design
What this covers
- The meaning and purpose of timbering
- Materials for timbering
- Timbering methods for different soils (firm, loose dry, loose wet)
- Erecting timbering to a foundation trench, and safety
What you will be able to do
- identify materials for timbering
- describe the use of different types of timbering
- illustrate timbering methods for different soils
- perform timbering to a foundation trench
- value the importance of timbering to foundation trenches
Key questions
“What is the role of timbering in building construction?”
Lessons
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Timbering
40 min · 1 practice tasks · quizWhat timbering is and why it matters, the materials used, how the method changes with the soil (firm, loose dry, loose wet), and how timbering is erected to a foundation trench safely.
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Meaning and purpose of timbering
40 min · 1 practice tasks · quizWhat timbering is, why foundation trenches collapse, and the role of timbering as temporary, life-saving support on Kenyan sites.
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Materials for timbering
40 min · 1 practice tasks · quizIdentifying timber boards, struts, walings, wedges, nails and the modern steel equivalents used to timber a foundation trench.
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Timbering members named
40 min · 1 practice tasks · quizHow poling boards, walings, struts and wedges fit together as a frame, and what close sheeting means.
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Timbering to firm soil
40 min · 1 practice tasks · quizOpen timbering for firm soil: few boards, gaps allowed, still erected as you dig - including dry laterite sites in Kenya.
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Timbering to loose dry soil
40 min · 1 practice tasks · quizCloser poling boards, walings and several struts for loose dry soil that crumbles - the middle method between open timbering and close sheeting.
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Timbering to loose wet soil
40 min · 1 practice tasks · quizClose sheeting and many struts for loose wet soil that flows - the most dangerous case on coastal, swampy and high-water-table Kenyan sites.
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Erecting timbering to a foundation trench
40 min · 1 practice tasks · quizThe sequence for putting timbering in as a strip-foundation trench is dug, lift by lift, including spoil heaps and striking afterwards.
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Timbering safety and the building code
40 min · 1 practice tasks · quizSafety rules for trench work in Kenya: never enter an unsupported deep trench, PPE, way out, spoil, inspections, and the duty under the building code and OSHA.
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Striking, reuse, and why timbering matters
40 min · 1 practice tasks · quizRemoving timbering safely, preserving materials for reuse, and valuing timbering as life-saving, code-required practice on Kenyan foundation sites.