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4-6. In all taine water, the moisture ,.';' 007 cases where basements are constructed in ground whféh' con- suitable provisions shall be made to properly carry off from such soil. ) 4-7. At least two (2) foundation wall, vents having a total effective area of one square foot for each fifteen lineal feet of exterior wall shall be installed in each basementless space. Vents shall be co~ered with 1/8" mesh non-corrodible ecreem1ng. Venting not required when basementless space is open to a ventilated basement. 4-8. Basement or cellar floor slabs shall not be less than three (3) inch concrete if finished monolithic; otherwise three (3) inch concrete and one (1) inch topping. 4-9. Wood posts in basements shall bear on a cement base which shall extend not less than four (4) inches above the finished floor and shall rest on top of the footing. Top of posts shall be 8e~urely fastened to the girders. 4-10. Beam filling will be required around all exterior openings in masonry veneer walls and all intersections of wood and masonry. 4-11. Basements shall be provided with means of light and ventilation of not less than two per cent (2,%) of the floor areâ. ' 4-12. An access opening of not less than lß"x24", or its equivalent, shall be provided to each basementless space under wood or metal floor construction. ' 4-13. The walls of chimneys used for stoves, ranges, fireplaces, heat- ing furnaces or other heating appliances regar~less of the type of fuel to be used shall be built of brick, concrete, stone or hollow tile of such thickness and construction as is hereafter specified. 4-14. All chimneys irrespective of which materials the walls are built shall be lined with fire clay flue lining or with fire brick. T~e lining shall be made for the purpose and adapted to withstand the temperatures and the resultant gases. 4-15. Solid brick or concrete chimneys shall not be less than four (4) inches thick exclusive of flue lining. A standard size brick laid flat- wise shall be deemed to fulfill this requirement for brick chimn~YB. 4-16. Stone and hollow tile chimneys shall have a minimum thickness of eight (8) inches. 4-17. Hollow tile may be used in the construction of a chimney only where said chimney is part of an exterior tile wall. 4-18. The foundation of an exterior chimney shall start below the frost line. 4-19. In frame buildings the chimney shall always be built from the ground up or rest upon the basement walls.