01-23-2015, 11:04 AM
Rat-trap bond in wall construction
This technique is developed by the architect Laurie Baker. The manner in which bricks overlap is called the bond. Stretcher bond (required to construct 125 mm thick partition walls), English bond (walls of thickness 250 mm or more), Flemish bond (decorative bond, used to construct walls of thickness 250 mm or morey) and rat-trap bond are some of the bonds. The rat-trap bond is laid by placing the bricks on their sides having a cavity of 4″ (100 mm), with alternate course of stretchers and headers The headers and stretchers are staggerd in subsequent layers to give more strength to the walls The main advantage of this bond is the economy in use of bricks, giving a wall of one brick
thickness with fewer bricks than a solid bond.
The main features of rat-trap bond wall are:
• Strength is equal to the standard 10″ (250 mm) brick wall, but consumes 20% less bricks.
• The overall saving on cost of materials used for construction compared to the traditional 10″ wall is about 26%.
• The air medium created between the brick layers helps in maintaining a good thermal comfort inside the building.
• As construction is done by aligning the bricks from both sides with the plain surface facing outwards, plastering is not necessary except in a few places. The finished surface is appealing to the eye.
• Buildings up to two stories can easily be constructed with this technique.
• In RCC framed structures, the filler walls can be made of rat-trap bond.
environmentportal.in/files/USE.pdf
This technique is developed by the architect Laurie Baker. The manner in which bricks overlap is called the bond. Stretcher bond (required to construct 125 mm thick partition walls), English bond (walls of thickness 250 mm or more), Flemish bond (decorative bond, used to construct walls of thickness 250 mm or morey) and rat-trap bond are some of the bonds. The rat-trap bond is laid by placing the bricks on their sides having a cavity of 4″ (100 mm), with alternate course of stretchers and headers The headers and stretchers are staggerd in subsequent layers to give more strength to the walls The main advantage of this bond is the economy in use of bricks, giving a wall of one brick
thickness with fewer bricks than a solid bond.
The main features of rat-trap bond wall are:
• Strength is equal to the standard 10″ (250 mm) brick wall, but consumes 20% less bricks.
• The overall saving on cost of materials used for construction compared to the traditional 10″ wall is about 26%.
• The air medium created between the brick layers helps in maintaining a good thermal comfort inside the building.
• As construction is done by aligning the bricks from both sides with the plain surface facing outwards, plastering is not necessary except in a few places. The finished surface is appealing to the eye.
• Buildings up to two stories can easily be constructed with this technique.
• In RCC framed structures, the filler walls can be made of rat-trap bond.
environmentportal.in/files/USE.pdf