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Building Control Regulations Part 3 movements or other effects that may be detrimental to the building irrespective of whether or not the Committee informed the applicant about the unstable soils or slopes in addition to the requirements of sub-article 3.1.1.1 (d). 3.1.14.3 No structure shall be built on slopes exceeding 20% unless explicit approval is obtained from the land bureau and the design for construction of such a structure has been made by a qualified structural engineer, indicating the stability of the aforesaid structure. The construction of structures may be allowed on slopes exceeding 20% if the land is excavated to level and approved retaining structures are so constructed to stabilise the excavated slopes, which should include adequate drainage facilities. 3.1.15 Excavations Designed by Engineers 3.1.15.1 Any excavation exceeding 3 meters below the original ground level or in situations where special geotechnical considerations exist shall be designed by an engineer. 3.1.15.2 An excavation for a foundation shall be taken down to a firm natural ground and the bottom made horizontal. This shall be indicated on the plans submitted under sub-article 3.1.1.1 (d). 3.1.15.3 Where an excavation for a foundation is in solid rock, the bottom of the excavation shall be taken into the rock to a depth not less than 300mm or the depth equal to the thickness of the foundation footing, whichever is greater. The engineer shall submit a technical solution equivalent to the provisions of this sub-article in special circumstances where excavating into the solid bedrock is not practicable. 3.1.16 Landscaping and Parking 3.1.16.1 A building application shall, for certain building types or localities prescribed by prior public notice by the Committee, include proposals for landscaping of the plot as part of the building operations. 3.1.16.2 The landscaping proposal shall be designed to achieve one or more of the following objectives: a) to enhance the aesthetics of the plot and the adjacent area; b) to provide a screen against environmental hazards, and c) to contain hazardous substances or activities within the building curtilage. 3.1.16.3 The proposal for landscaping shall include indigenous flora and local materials wherever practicable. 3.1.16.4 Parking for automobiles, vans, buses and trucks shall be provided within the boundary of the site in accordance with the Third Schedule. SECTION 3.2 STRUCTURAL DESIGN 3.2.1 Dead and Imposed Loads Ministry Of Infrastructure 3.7
Building Control Regulations Part 3 3.2.1.1 For the purpose of calculating the dead load of a building or any part of a building, the weights of all building material shall conform to the approved standard specifications, design guidelines, or the British Standards. In the case of materials not mentioned in the required documents, the weights shall be determined by tests to be carried out by an approved laboratory. 3.2.1.2 Where the positions of permanent partitions are shown on the plans furnished to the Committee, the weight of the partitions shall be included as dead load. 3.2.1.3 Where it is intended to erect partitions which are not shown on the plan, the beams and the floor slabs, where they are capable of distributing the load effectively over the area of floor, shall be designed to carry, in addition to other loads, a uniformly distributed load per square metre of not less than 30% of the weight per metre run of the finished partitions, or in the case of a floor being used as an office, the design shall be based on the calculated load or a load of 1 kN/m 2 , whichever is greater. 3.2.1.4 The imposed loads on the floors, stairs, landings, corridors, balconies, beams, columns, piers, walls, structural frames or any other parts of the building shall be derived from the imposed loads specified in the Structural Design Guidelines or the British Standards, whichever proves more onerous, and where it is known that the actual imposed loads shall exceed those derived, the higher loads shall be adopted in the design. 3.2.1.5 In the design of columns, piers or walls supporting two or more floors in any building other than a warehouse, garage or building to be used wholly or predominantly for storage, the total imposed floor loads calculated in subarticle 3.2.1.4 may be reduced by the percentage specified in the Fourth Schedule for a factory or a workshop. The minimum total imposed floor load for any column, pier or wall shall not be less than 5kN/m 2 on all floors supported. 3.2.1.6 For the purpose of Article 3.2.1, a roof shall have the same meaning as a floor. 3.2.1.7 Where a single span of a beam supports not less than 50m 2 of floor area at one general level and the floor is not to be used for storage purposes, the imposed loads as calculated in sub-article 3.2.1.3 for the design of the beam may be reduced by 5% for each 50m 2 of supported floor, subject to a maximum reduction of 25%; a similar reduction may be taken into account in the design of any column, pier or wall supporting the beam. 3.2.1.8 Any load specifically allowed for plant or machinery shall not be reduced in order to comply with these Regulations. 3.2.1.9 For the design of roofs, the following imposed loads shall be allowed in addition to wind and dead loads: a) on roofs where access is provided, an imposed load of 1.5 kN/m 2 shall be taken subject to a minimum load of 3.5kN uniformly distributed over the span in the case of all beams; and b) on roofs where access is not provided other than for maintenance, an imposed load of 0.5 kN/m 2 shall be taken. 3.2.1.10 For sloping roofs with slopes greater than 10° where access has not been provided, the following shall apply: Ministry Of Infrastructure 3.8
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rwanda building control regulations - Research ICT Africa

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