C: Roof system because of thermal expansion and contraction causes damage
Roof Board at the local minimum or maximum temperature of temperature and the
temperature at the installation under, will have to expansion and contraction
Expansion and contraction of the volume of L formula
¡÷L=¦Á¡Á¡÷T¡ÁL
Where£º
¦Á--Roof Board of linear expansion coefficient1.2¡Á10-5/¡æ
¡÷T--Roof Board may encounter temperature ¡æ
L--Roof Board Length m
Expansion and contraction, in a fixed roof slabs will have stress§¢
§¢=¦Á¡Á¡÷L¡ÁE
Where E----Roofing in elastic modulus
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