Rat trap bond is a brick masonry method of wall construction, in which bricks are placed in a vertical position instead of conventional horizontal position and thus creating a cavity hollow space within the wall. Tartrap bond cost effective and innovative housing. Jayasinghe and others published comparative performance of masonry bond patterns find, read and cite all the research you need on researchgate. Contrary to other technologies, this amazing building technology is not new to us. With this technique there is reduction in cost of the wall by 25%, as with conventional english. Rat trap bond this rare bond was used in the early to mid 19th century as a cheap form of brickwork by laying the bricks on edge. Using a rattrap bond for building a selfsupporting constructions more. Rat trap bond advantages and disadvantages engineering.
Exploring most effective brick masonry bond and that is rat trap bond. May 22, 2017 rat trap bond is a brick masonry method of wall construction, in which bricks are placed in vertical position instead of conventional horizontal position and thus creating a cavity hollow space within the wall. According to the result obtained the use of frp test on rat trap bond prism inhibits the outofplane mechanisms of masonry walls and permits the transfer of stresses to the wall parallel to first, prisms consisting of rat trap bond were tested under the direction of seismic action and increase in ductility compression load as shown in fig. Flemish bond shows more attractive and pleasing appearance of masonry work. Rat trap bond or rat trap bond bond social media links. This multifaceted brick facade takes inspiration from laurie. Nov 06, 2012 the rat trap bond isnt nearly as popular as it should be, unfortunately. Im sure readers will also be happy to know that a 120 yearold house built with this method is still going strong. This short video shows you the building that was built using rat trap bond laurie baker model walls and high ceiling to regulate the temperature inside the. This arrangement creates a hollow space in the wall.
Both these bond patterns were used for the experimental programme with one brick thick walls. One such building technique is the use of rat trap. Rat trap bond pdf a rattrap bond is a type of wall brick masonry bond in which bricks are laid on edge i. Three similar completed works each costing not less. The mortar joints are the weakest as well as the most expensive part of the masonry for a onestorey load bearing building1. Rat trap bond is a modular type of masonry bond in which the bricks are placed in a vertical position which creates a cavity in the wall while maintaining the. One such building technique to save energy is the use of rat trap bond rbt masonry. Tartrap bond cost effective and innovative housing technology. For superstructure walls, we have used rat trap bond brick masonry work. Rattrap bond system consists of an array of headers 8281 has defined a box type construction as consisting and stretchers with bricks laid vertically on the edge of masonry wall along both the axes of the building. Flemish bond is economical as it uses broken brickbats, although it requires some extra mortar for additional joints.
Pdf comparative performance of masonry bond patterns. Pdf seismic behaviour of single storey rattrap bond. Wall for a two storeyed building with rcc roof load on the wall 40kn. Brick masonry types, tools, materials required and procedure. Rat trap bond is a masonry technique in which the bricks are laid in such a manner that a cavity is formed between two faces of the wall. Rat trap bond information civil engineering facebook. Rat trap bond is a brick masonry method of wall construction, in which bricks are placed in vertical position instead of conventional horizontal position and thus creating a cavity hollow space within the wall.
Of bricks and bonds the rat trap bond architecturelive. It is really amazing amongst all other types of brick masonry bond which you prefer fo. Rat trap bond advantages, disadvantages, construction. Jul 11, 2016 rat trap bond is a brick masonry method of wall construction, in which bricks are placed in vertical position instead of conventional horizontal position and thus creating a cavity hollow space within the wall. For example, in the uk a brick is defined as a unit having dimensions less than 337.
It can be avoided by the use of snapped headers to create other forms of brickwork. The ultimate strength of masonry depends on the brick quality and the bond strength between the bricks. Technology rat trap bond masonry and filler roof slab in bihar. Building walls with rat trap bondtheyre really cool bt. The rat trap bond is a masonry technique in which the bricks are laid in such a manner that a discontinuous cavity is formed between two faces of the wall. Rat trap bond brick wall construction by earthbound architecture.
This gives the wall an internal cavity which provides effective thermal insulation. Agencies must have executed similar work of value given below during last 5 years i. Rat trap bond masonry international research publication house. Low cost rat trap bond for brick masonry iamcivilengineer. Rat trap bond advantages, disadvantages, construction method, saving rat trap bond is known as the chinese bond. Uses of flemish bond is a bit difficult than english bond. Random rubble arch foundation is used for these houses. State the principles of filler slabs and construction detail. The mortar joints are the weakest as well as the most expensive part of the masonry for a. Introduction to rat trap bond masonry rtb a rat trap bond is a type of wall brick masonry bond in which bricks are laid on edge i. Advantages of using rat trap bond requires approximately 25% less bricks and 40% less mortar than traditional masonry.
The overall cost saving on this wall compared to the conventional 9 wall is about 26%. It consists of construction of headers and stretchers where bricks are used to lay vertically in the edge of the masonry wall, so as to form a cavity inside the wall as in fig. If we want to reduce our footprint on this planet, this is a great way to start. Rat trap bond brick wall laid in rat trap bond photographed near angelsea road, wivenhoe, essex, england. Sustainable lowcost housing using cost effective construction. Walls using the rattrap bond technology docdeveloppement. Reinforced rat trap bond masonry also ensures proper confinement, an integral action, and provides better ductility during earthquakes. Technological application features of brickwork bonding types. Pdf energy efficiency and sustainability are the basic needs of.
Rat trap bond advantages and disadvantages of rat trap bond. Brickwork is masonry produced by a bricklayer, using bricks and mortar. This is also 9 inches 23 cms thick, load bearing wall but in this type of wall construction, bricks are used in such a way that it creates a cavity throughout the wall height. In the rat trap bond, bricks are placed in a vertical position in the form of a shiner stretcher in the vertical form and rowlock the header in the vertical form with a cavity in between the shiner at back and front face. Stretcher bond now used for most cavity brick walls but has a monotonous appearance. If the bricks available, are having a compressive strength of more than 4. Laurie baker rat trap bond wall model building after more. Contrary to other technologies, this amazing building technology is not new. Rat trap bond construction of rat trap bond advantages. As far as load bearing is concerned, it has 25% more load bearing capacity as compared to that. Rat trap bond pdf a rat trap bond is a type of wall brick masonry bond in which bricks are laid on edge i. Typically, a 75mm cavity is formed in a 230mm thick wall by placing the bricks on edge in a modular fashion. Remember above the lintel there are in most cases no openings but masonary has to continue. Pdf comparison of performance of rat trap brick bond with.
This is a brick masonry method of wall construction in which the bricks get placed in a vertical position instead of horizontal position which creates the cavities or hollow space in the wall. Basics of rat trap bond module, ends, l and t junctions importance of laying uniform thickness of mortar correct calculation of length of walls as per rat trap modules different types of pointing use of tools in rat trap bond understand the basics of rat trap bond masonry practice limitations of rat trap bond. In order to have a 35 figure 2 rat trap bond under construction comparison, locally manufactured standard and nonstandard burnt clay bricks were used to construct wall panels with english bond, and rat trap bond to a thickness of one brick. Pdf comparison of performance of rat trap brick bond with the. Thus 110 mm face is exposed from front elevation for brick size of 230mmx110mmx75mm. Cost wise comparison on gap fillers in masonry walls. Rat trap bond also chinese bond substantially observes the same pattern as flemish bond, but consists of rowlocks and shiners instead of headers and stretchers. The rat trap bond is a brick masonry method of wall construction in which bricks are placed in a vertical position instead of a conventional horizontal position and thus creating a cavity within the wall that increases thermal efficiency, cuts down on the total volume of bricks used, and is ideal for concealing structural members and service ducts. Laurie baker introduced this technique for low cost housing saileysh sivaraja. Types of brick bonds difference between english bond. The rat trap bond construction technology is a cavity walling system. Most effective brick masonry bond really amazing rat. Rat trap bond construction, advantages, and disadvantages.
Rat trap bond brick wall construction by earthbound. An experimental investigation of the behaviour of modified rattrap. Reinforced rat trap bond masonry also ensures proper confinement. The first rule of starting any masonary whether exposed or not is to place all the units bricks, blocks, or stones in the bond decided all over the plinth even covering the door openings. The rat trap bond is a masonry technique, where the bricks are used in a way which creates a cavity within the wall, while maintaining the same wall thickness as for a conventional brick masonry wall. Pdf estimation on rattrap bond manas dimri academia. The rat trap bond construction is a modular type of masonry construction. Earth bricks and blocks comparative performance of bu rnt. While in a conventional english bond or flemish bond, bricks are laid flat, in a rat trap bond, they are placed on edge forming the inner and outer. Pdf comparison of performance of rat trap brick bond. See more ideas about rat traps, brick wall, brickwork. Pdf experimental investigation of rattrap bond masonry. Flemish bond requires more skilled labour and supervision.
Rattrap bond also chinese bond substantially observes the same pattern as flemish. Rat trap bond masonry is a cost effective application of brick masonry that has been popularised in india by the architect laurie baker in the last 2030 years. Rat trap bond is a kind of wall brick masonry bond in which bricks are sited. It excludes brick splitting that makes bricklaying process less labour consuming. This video explains what rat trap bond in brick masonry brickwall is. In this type of brick, masonry bricks are placed on edges making visible the shinner and rowlock. It creates a cavity inside it while the wall thickness remains the same. Rat trap bonds this doublewall technique uses bricks on edge with a cross brick between each and produces a 9inch thick wall with an insulating air cavity in between. It can be used for building houses of fewer than 3 stories and is still used as an economical bond, as well for the insulation properties offered by the air cavity. Rat trap bond is a special type of masonry construction which is economical when compared to conventional masonry. Rat trap bond rtb is a brick wall construction technique in which bricks are laid on.
Now a days it has become a costly material so it is better to use less bricks in. Evaluation of appropriateness of rattrap bond wall and. The load bearing tests done at the anna university has proven that a wall in rat trap bond performs as good as the usual english bond. The rat trap bond is a masonry technique, where the bricks are used in a way that creates a cavity within the wall while maintaining the same wall thickness as for a conventional brick masonry wall. Oct 30, 2020 rat trap bond is a kind of brick masonry wall in which bricks are laid in a vertical position instead of the traditional horizontal position. Rattrap bond saves consumption of bricks by 18% and cement by 24% as compared to conventional english bond in addition to being lighter by 25% in weight. Stretcher bond is only use in half brick thick wall like partition wall, sleeper wall. Typically, rows of bricks called courses are laid on top of one another to build up a structure such as a brick wall bricks may be differentiated from blocks by size. The principal requirement for rat trap brickwork is the availability of good quality bricks. A rat trap bond is a type of wall brick masonry bond in which bricks are laid on edge i. Seismic behaviour of single storey rat trap bond masonry buildings retrofitted with gfrp more by saileysh sivaraja the paper presents in detail the experimental and numerical investigation using ansys on model of a rat trap building of size 2. Rat trap bond is a modular type of masonry bond in which the bricks are placed in a vertical position which creates a cavity in the wall while maintaining the same wall thickness as that of the conventional brick masonry wall.
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