SOME :\IUNICI1'AL ENGINEERING I'KOBLEMS IN THE TROPICS 



:!()9 



Table " B " 

 Thickness of walls iu domestic buildings built iu local sandstone, the beds or courses being horizontal. 



Specivi] 

 Regulations 

 (contiitiu'd j 



Provided always that if any story exceeds in height 10 times the thickness prescribed for its walls, the 

 thickness of each external wall, and of each party wall throughout that story, shall be increased to one-tenth 

 part of the height of the story, and the thickness of each external wall and each party wall below that story 

 shall lie proportionately increased. 



Diiiieiisioiis of cross walls 



45. Any internal party or cross wall not supporting roof or 

 one-fourth than the dimensions prescribed for an external wall. 



» Iron eolaiatis 



floor beams may bo tlihiner to the extent of 



4G. Where any of the main walls within a building are supported by or rest upon iron beams or columns 

 at the gi'ound story such beams or columns shall be surrounded and suitably protected agamst fire by plaster or 

 cement or other tirrprooting material J inch ^'Ol'J metre) thick. 



Opoilnfjs mid ri'ccsscs in iriflls 



47. If any openings or recesses are left or made in any wall to an extent greater than onc-h;ilf of the 

 superficies of the wall of any story, or if any openings or recesses are left or made which extend into two or 

 more stories the wall between such openings shall be strengthened by sufficient pilasters, buttresses or counterforts 

 or otherwise, and in every such case a sufficient pier or other support shall be provided at the corner or angle of 

 any two streets on which any building abuts or within 3 feet ("915 metre) thereof. For the purposes of this 

 regulation a recess includes any part of a wall which is of less than the thickness prescribed for a wall of that 

 description. 



Damp course 



48. Every wall of a building, if liuilt of brick, stone or concrete and resting on the ground, shall, if 

 required by the Municipal Authority, have a damp course throughout its entire thickness, and such damp course 

 shall be of a duralile material impervious to moisture. The damp course shall be below lowest floor level and 

 at least G inches ('loS metre) above the surface of the ground. 



/'rottxtlon of ti other front Li:hUr tints 



49. All tinihcr posts and beams shall lie properly protected from the attacks of white ants. 



Beams trnd lintels 



50. Every beam shall have a sufficient bearing at each end arranged so that the load is properly trans- 

 mitted to and distributed over the wall by means of a beam block or otherwise. 



Wood lintels shall have a depth of at least 1 inch ('OSo metre) for every foot ('^Oo metre' span of opening 

 and shall be coated with preservative. 



Slrenijtli of buildings 



51. Buildings of unusual construction or for special purposes must be made of sufficient strength, and all 

 buildings must be designed and constructed so that the completed structure, exclusive of the materials of which 

 it is composed, shall be able to carry as a safe load the weights following, viz. : — 



Dwelling houses 100 lbs. per scpiare foot of floor (489 kilograms per sr|. niefre) 



Halls, Schools and Public Buildings 150 lbs. ,, ,, ,, ,, ,, (73.3'5 kilograms per sq. metre) 

 Warehouses and Workshops ... 200 lbs. ,, ,, ,, ,, ,, (978 kilograms per sq. metre) 



.\ roof must be so constructed as to carry safely a load of 50 lbs. per sq. foot of surface ('244'5 kilograms 

 per sq. metre) exclusive of the materials of the roof itself. A Hat roof which is intended to !«■ use<l as a floor 

 must be designed to carry the load prescribed for a floor. 



U I 



