A WALL CONSTRUCTED IN TWO LEAVES OR SKINS WITH A SPACE OR CAVITY BETWEEN THEM IS CALLED A CAVITY WALL.
USED AS AN EXTERNAL WALL.
THE MAIN PURPOSE OF CONSTRUCTING A CAVITY WALL IS TO PREVENT THE PENETRATION OF RAIN TO THE INTERNAL SURFACE OF THE WALL.
IT MAY OR MAY NOT BE REINFORCED.
ACCORDING TO BUILDING REGULATION RULES :
THE CAVITY SHALL NOT BE LESS THAN 50 MM NOR MORE THAN 75 MM IN WIDTH AT ANY LEVEL.
EACH LEAF SHALL NOT BE LESS THAN 100 MM IN THICKNESS AT ANY LEVEL.
FOR A NOMINAL 255 MM WIDE CAVITY WALL OF ANY LENGTH THE MAX. HT. IS 3.6 M & FOR LENGTH NOT EXCEEDING 9 M , THE MAX. HT. IS 9 M.
INNER LEAF CAN NOT BE LESS THAN 75 MM THK. IF THE WALL FORMS PART OF APRIVATE DWELLING HOUSE OF ONE STOREY OR IS THE UPPER STOREY OF SUCH A DWELLING HAVING ONLY TWO STOREYS.
A GAUGE MORTER NOT WEAKER THAN 1:2:9 SHOULD BE USED.
ADVANTAGES :
IT IS ABLE TO WITHSTAND A DRIVING RAIN IN ALL SITUATIONS FROM PENETRATING TO THE INNER WALL SURFACE.
NO NEED FOR EXTERNAL RENDERING
GIVES GOOD THERMAL INSULATION,KEEPING THE BUILDING WARM IN WINTER & COOL IN SUMMER.
ENABLES THE USE OF CHEAPER & ALTERNATIVE MATERIALS FOR THE INNER CONSTRUCTION.
POSSESSES HIGHER SOUND INSULATION VALUE THAN A STANDARD BRICK WALL.
DISADVANTAGES :
REQUIRES HIGH STANDARD OF DESIGN & WORKMANSHIP TO PRODUCE A SOUNDLY CONSTRUCTED WALL; THIS WILL REQUIRE GOOD SUPERVISION DURING CONSTRUCTION.
SLIGHTLY COSTLIER THAN A STANDARD 1 BRICK THK. WALL.
IT IS NEEDED TO INCLUDE A VERTICAL D.P.C. TO ALL OPENINGS.
CAVITY BLOCK CONSTRUCTION
HOLLOW CONCRETE BLOCKS ARE USED FOR THE CONSTRUCTION.
DIFFERENT SIZES & TYPES OF BLOCKS ARE AVAILABLE.
THE TYPE OF BLOCK DEPENDS UPON WHERE IT IS TO BE USED.
DIFFERENT TYPES OF CAVITY BLOCKS
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