MASONRY WALL FENCING.
Wall height can vary between a minimum of 2.1 meters to a maximum of 2.8 m high.
Wall finishes can vary between low cost, middle cost and high cost finishes.
LOW COST WALL FINISHES.
This is a wall that comprises of masonry stone walling, machine cut dressed, without any pattern. This is done without a coping at the top and without any keying.
A square meter of masonry walling is estimated at KES 800 . This cost is derived as follows:
The cost of a machine cut stone delivered around Nairobi is KES 55. A meter squared has 13 stones.
This totals to KES 715. Add 10% for labour and joining cement mortar. This brings to approximately KES 800 per m2.
A good example is the walling commonly seen in low income areas such as Dandora and Kayole.
MIDDLE COST FINISHES.
This characterizes a wall that is made up of masonry machine cut or hand dressed stone, laid carefully with impressive workmanship. It comprises keying and masonry coping at the top. A touch of pattern is also included such as alternating stones of a different colour.
A good example is the walling commonly seen around Kitengela, Ngong and Ongata Rongai areas.
This is estimated at KES 1200 per m2.
HIGH COST FINISHES.
This comprises of hand-dressed masonry walling that is carefully patterned. Designs such as zero-jointing characterize this finish. Intricate indented patterns are also common with this type of finish.
A good example is the masonry walling located opposite Gertrude Children’s hospital in Muthaiga.
This is estimated at KES 2000 per m2.
The average depth of a wall foundation is 1 m . This varies from region to region depending on how deed the stable ground is. Some grounds will only require a few centimeters of depth while others require many meters.
The foundation can be constructed using Reinforced Concrete base. This is expensive since the price of cement and steel is high.
I have developed a method whereby the Reinforced concrete is substituted with two layers of masonry walling laid across each other. This saves costs.
Every 3 meters should be braced with either masonry walling or Reinforced concrete columns.
Masonry walling offers a more cost-effective option as a support.
Fence height:[m] 2.8
1 m deep foundation
Total wall height: 3.8
Surface area[m2] 1219
low cost finishes 975,200.00
middle cost finishes 1,462,800.00
high cost finishes 2,438,000.00
Fence height:[m] 2.1
1 m deep foundation
Total wall height: 3.1
Surface area[m2] 993
low cost finishes 794,400.00
middle cost finishes 1,191,600.00
high cost finishes 1,986,000.00
Architect Francis Gichuhi Kamau