How does thermal movement occur?
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Other examples of thermal expansion include: - The air in a car tyre gets warm after a long journey and this increases its pressure. - Railway lines require expansion gaps (similar to bridges) to avoid buckling in hot weather.
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Thermal movement is basically caused by the expansion and contraction of the fabric of the building due to hot and cold weather. ... Modern structures are sometimes built without any expansion joints so the thermal movement cannot be accompanied within the masonry so cracking occurs.
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