Topic BONDING IN BRICKS CONTENTS INTRODUCTION RULES OF

Topic: - BONDING IN BRICKS

CONTENTS: Ø INTRODUCTION Ø RULES OF BONDING Ø TYPES OF BONDING • Stretcher bond • Header bond • English bond • Flemish bond

INTRODUCTION: The art of bonding bricks consists of the orderly arrangement of bricks in such a way that continuous or through joints at right angels to the face of the wall are eliminated and longitudinal through joints along the wall are also reduced to a minimum. Ø Bonding helps in the distribution of loads as shown in the fig. Ø

(a) Lack of distribution of load with no bonding. (b) Good distribution of load with bonding

RULES OF BONDING: To ensure good bond with 9”*4(1/2 )”*3” bricks , the following rules should be observed. Ø The amount of lap should be minimum 1/ 4 th brick along the length of the wall and 1/2 brick across the thickness of the wall. Ø The bricks should be of uniform size, to get uniform lap. Ø The stretchers should be used in the facing. The hearting should be carried out with headers only. Ø Bats should be used as little as possible and where used , should be evenly distributed throughout the whole of the work. Ø The bricks in the interior thickness of the very thick walls should be laid with their length across the wall.

TYPES OF BONDING IN BRICKS Ø Stretcher bond Ø Header bond Ø English bond Ø Flemish bond

STRETCHER BOND Ø A bond consisting of solely of stretchers , except that headers or 3/4 th bricks are used or inserted where necessary for breaking bond or to make up length between openings. Ø A stretcher is the longer face of the brick as seen in the elevation. Ø In the brick of size 190 mm × 90 mm, 190 mm × 90 mm face is the stretcher. Ø In stretcher bond masonry all the bricks are arranged in stretcher courses as shown in Fig

Stretcher Bond

Isometric view of stretcher bond Stretcher bond

USES: Ø This type of construction is useful for the construction half -brick partition walls and for the half-brick leaves of cavity. Ø It is commonly used in the steel or reinforced concrete framed structures as the outer facing.

HEADER BOND Ø A header is the shorter face of the brick as seen in the elevation. Ø The bond does not have strength to transmit pressure in the direction of the length of the wall. Ø In a standard brick it is 90 mm × 90 mm face. Ø In header bond brick masonry all the bricks are arranged in the header courses as shown in Fig

Header Bond

Header bond

USES Ø This type of bond is useful for the construction of one brick thick walls. Ø It is used for curved surfaces in brickwork because stretchers , if used for curved surfaces , would project beyond the face of the wall.

ENGLISH BOND Ø English bond consists of alternate headers and stretchers. Ø Each alternate header is centrally supported over a stretcher. Ø This is considered to be the strongest bond. Hence it is commonly used bond for the walls of all thicknesses. Ø This is called queen closer. The queen closer is put next to the quoin header to develop the face lap. Ø The number of mortar joints in the header course is nearly double than that in the stretcher course. Ø In this bond , continuous vertical joints are not formed except at certain stopped ends. Ø If the wall thickness is an even multiple of half-brick , the same course shows headers or stretcher in both the front and the back elevations. But if the wall thickness is an uneven multiple of halfbrick , a course showing stretcher on the face shows header on the back and vice versa.

English Bond

ENGLISH BOND

USES Ø This bond is mainly used today as a decorative bond , often used in garden landscaping for screen walls.

FLEMISH BOND In this type of bond each course comprises of alternate header and stretcher. Ø It is perhaps not quite as strong as English bond. Ø It is economical because it requires fewer facing bricks. Alternate courses start with stretcher and header. To break the vertical joints queen closers are required, if a course starts with header. Every header is centrally supported on the stretcher below it. Ø Flemish bonds may be further classified as � Double Flemish Bond � Single Flemish Bond. Ø In case of double Flemish bond, both faces of the wall have Flemish look, i. e. each course consist of alternate header and stretcher, whereas single Flemish bond outer faces of walls have Flemish look whereas inner faces have look of English bond.

Flemish bond

USES Ø This bond is preferred where special bricks are used for facing work on the grounds of greater economy and more interesting appearance.

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