4.1 – Rainwater collection and drainage systems – 6. Joints for compensation of thermal expansion in gutters 276 4.1. 6. JOINTS FOR COMPENSATION OF THERMAL EXPANSION IN GUTTERS The metals used for the rainwater collection and disposal system are subject to thermal expansion and contraction. In the design and construction of the gutters it is therefore necessary to allow the thermal expansion of the materials and their structure according to the variations in temperature. According to standard UNI 10724, a temperature difference of 80 K approximately from -20 ° to +60 ° C must be considered. However, these temperatures vary depending on the installation site, altitude, orientation and exposure to sunlight. For the values of the linear thermal expansion coefficients, please refer to chapter 2.4. 1. Thermal actions for zintek® roof claddings – General information. All joints and fixings must be made in such a way as to allow the components of the gutter system to expand and contract as the temperature changes. To this end, it is advisable to maintain a length of less than 10 m for the sections of exposed gutter. For longer lengths it is necessary to use expansion joints. The following table shows themaximum indicative values of the distance between expansion joints in external and internal gutters. For the expansion joint, a possibility of movement ≥ 20 mm is considered. Component Distances Suspended gutters placed outside the pitch 10.0 m Gutters placed inside the pitch 8.0 m The above values should be halved in the distribution of the joints in the corner areas and in the fixed discharge points in the internal gutters. Center distance of the joints in the linear sections. Center distance of the joints for the external corners. Center distance of the joints for the internal corners. ≤ 10 M ≤ 5 M ≤ 5 M EXCERPT
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