Of Bricks and Bonds – The Rat Trap Bond

Earth Bound Architecture

Earth Bound Architecture

Post by Earthbound Architecture

Share Post:

Share on facebook
Share on linkedin
Share on twitter
Share on pinterest
Share on email

Rat Trap Bond - iStudio ArchitectureRat 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. Architect Laurie Baker introduced it in Kerala in the 1970s and used it extensively for its lower construction cost, reduced material requirement and better thermal efficiency than conventional masonry wall, without compromising strength of the wall. The original post appeared on Earthbound Architecture Website and has been reproduced with the permission from the author.


CONSTRUCTING BRICK WALL USING RAT TRAP BOND

Rat Trap Bond - iStudio Architecture
Constructing Brick Wall using Rat Trap Bond

The bricks are placed in vertical position, so that 110 mm face is seen from front elevation, instead of the 75mm face (considering brick of standard size 230 X 110 X 75 mm). Since width of wall remains 230mm, an internal cavity is created. This is where approximately 30% Material (brick and mortar) is saved and thus overall construction cost is reduced. Cavity provides effective thermal and sound insulation. This makes rat trap bond energy and cost efficient building technology.

POINTERS

Rat Trap Bond - iStudio Architecture
Corner Junction Details
  • Bricks should be of good quality with consistent size and straight edges
  • First layer (bottom) and last layer (top) of the wall should be solid (without cavity).
  • Layer at sill and lintel levels of opening and sides of opening should be solid (without cavity) for fixing frames.
  • Reinforcement bars can be put in vertical cavities at corners and around openings to improve earthquake resistance.
  • Reinforcement bars can be put in horizontally to make lintels and to improve earthquake resistance.
  • Electrical conduits and plumbing pipes, with prior planning, can be put inside cavity for better aesthetics.

ADVANTAGES OF USING RAT TRAP BOND

Rat Trap Bond - iStudio Architecture
Brick wall with window opening
  • Requires approximately 25%  less bricks and 40% less mortar than traditional masonry
  • Reduced material requirement results in considerable cost saving
  • Strength of wall is not compromised, it remains same as traditional masonry wall.
  • Cavity induced in wall provides better thermal insulation, resulting in cooler interiors during summer and warmer interiors during winter.
  • All vertical and horizontal reinforced bands, lintels (for standard size openings), electrical conduits are hidden inside wall, resulting in better aesthetic appearance without plastering (exposed brickwork).

Share your comments

This site uses Akismet to reduce spam. Learn how your comment data is processed.

You May Also Like

Our pursuit as a variated and connected team - Triple O Studio

Our pursuit as a variated and connected team – Triple O Studio

A team composed of multifaceted creative individuals witnessed an opportunity to rethink their existing process of operating with a variety of work bubbles within a single studio. The team also experienced good sustenance with their different channels of work, their off-studio initiatives, alongside their strong connectivity within the studio team.

Read More »
"Team spirit and resilient work processes are a necessity"- FUNKTION DESIGN STUDIO

Team spirit and resilient work processes are a necessity – Funktion Design

The team at Funktion Design experienced the challenges of keeping up the morale of their personnel during fears of the pandemic. The studio had identified ways of enlivening their workspace to maintain the team’s vibrancy and increased the spirit between members. The studio’s relatively fresh experience with cloud working systems has helped them realize the importance of resilient in-studio work processes to pre-empt any future challenges like this pandemic.

Read More »
"Additional fundraising challenges and refreshed social goals." - NIVASA NGO

Additional fundraising challenges and refreshed social goals – Nivasa NGO

Nivasa NGO, possessing a network of advisors, fellow NGOs and funders, collectively witnessed additional strain on their monetary channels to aid their initiatives. The lockdowns, however, helped principal architect Akhila Ramesh to reinvent her journey with the Nivasa NGO team. With a rejuvenated studio structure and efforts to implement dignified living for the urban and rural poor, the team hopes to expand their friend network and funding avenues to aid their cause.

Read More »
"Sustaining with core research and social opportunities" - Ketham’s Atelier Architects

Sustaining with core research and social opportunities – Ketham’s Atelier

Ketham’s Atelier has been focussed on researching the core concepts of architectural design and becoming well versed with the associated skill sets. Additionally, the studio also has been running an NGO practice to impart the learnings through teaching methods. Together, the studio witnessed the importance of their research in helping them sustain through a time like the pandemic.

Read More »
New Children Space by Thinkcutieful (8)

Thinkcutieful designs a playroom for two sisters

Delhi based Design studio ThinkCutieful, specializing in creating beautiful spaces for children, has completed the décor of a modest playroom making it easy for a kindergartener and a toddler to play, scribble, exercise and relax within the safety of their home environment. A playroom, which is as fun as it is functional, is the best gift the parents could give their kids. Thinkcutieful, a mother and baby design company Founded in 2009 by Ms. Romilla Tewari – a pioneer in the field of children’s environments

Read More »

Subscribe to Architecture and Design Updates