Civil Engineering/lintel beam size



Is there any thumb rule for the lintel beam concrete depth.

for an opening of 8 feet width and 4 feet height, what would be the lintel beam depth. We have used a 6 inches depth, 6 inches wide RCC with 3 number 12 mm rods at top and bottom. This has a bearing of 6 inches on either side.

On top of this 5 course of brick wall is constructed. Is this lintel takes the load of these brick wall

please suggest.

warm regards

Hi Sudarshan,

The beam depth should be between span/15 to span/20, so 6 inches is fine and practical. The amount of rebar is also fine- you may be able to reduce it to 10mm rebar if HT steel is used. Make sure the bottom rebar is bent upwards to get proper anchorage at the far ends of the lintel.

Civil Engineering

All Answers

Answers by Expert:

Ask Experts


Arshad Khan


I can answer any questions to do with civil and structural engineering consultancy and construction industry in East Africa and the Middle East, and specifically with the analysis and design of reinforced concrete structures. My particular expertise is in the aseismic design and optimisation of tall buildings.


Employment history: 40 years in Construction and consultancy in the UK, Kenya, Tanzania, Uganda, Ethiopia, Eritrea, South Africa, Somalia, Zambia, Austria, Bahrain, Kuwait, Doha and the U.A.E.

.Fellow of Institution of Structural Engineers (UK) .Fellow of Institution of Civil Engineers(UK) .Member of the Institution of Engineers, Kenya .Registered Engineer, ERB, Kenya .Member of the Architectural Association of Kenya (Engineers Chapter) .Chartered Engineer (UK)

•1984: International Conference on the Art and Practice of Structural Design, London •1994: 3rd Int. Kerensky Conference in Structural Engineering, Singapore •2008: International Conference on High-Rise Towers, Abu Dhabi •2013: IEK International Conference, Kisumu, Kenya

BSc, 1st Class Hons, in Building Engineering, University of Bath, UK MSc in Concrete Structures and Technology, University of London. Diploma of Imperial College, UK.

Awards and Honors
•Science Congress Special Award (for 2-seater Hovercraft - 1968) •Institution of Civil Engineers Award for outstanding performance at Bath University (1975) •Concrete Society Postgraduate study Bursary Award (1976) •Consular Representative for British High Commission, Nairobi. (1995 to 1998) •Examiner for Institution of Civil Engineers Professional Interviews, Nairobi. (1997 to 1998) •Branch Representative in Vienna for PI assessment for Inst. of Struct. Engrs. (1999 to 2010)

©2017 All rights reserved.