The Institution of Engineers of Kenya (IEK) has raised safety concerns over structural defects observed at Karibu Homes in Athi River, Machakos County, following a preliminary visual inspection of the residential development.
IEK said the development comprises 500 residential units spread across 63 apartment blocks. During the inspection, engineers observed structural cracks in Blocks M, N and P within London Court, prompting some residents in the affected units to vacate their homes over safety concerns.
According to the engineers, the cracks were first noticed in 2019 and have continued to widen.
The pattern of cracking could indicate differential settlement, meaning that sections of the foundation may be sinking unevenly.
The engineers also identified concerns with stormwater drainage around some of the affected buildings.
They found that the drainage system was poorly constructed in some areas, while roof downpipes discharged water close to building foundations.
IEK warned that persistent water accumulation could, over time, weaken the soil supporting the foundations.
Damp-related deterioration was also observed at the lower sections of some external walls.
IEK said the damage appeared to be associated with prolonged exposure to standing water, which could weaken load-bearing walls.
However, the engineers cautioned that the findings remain preliminary and that they have not established the definitive cause of the defects.
IEK said a comprehensive technical investigation is required to determine the condition and safety of the affected buildings.
The assessment will examine the adequacy of the foundation systems and supporting ground, compliance with approved structural designs, concrete quality and strength, reinforcement, construction methods and the timing of formwork removal.
The investigation will also examine whether any subsequent alterations may have affected load paths and whether professional supervision and quality control processes were adequate during construction.
IEK has recommended destructive and non-destructive structural tests on the affected blocks, alongside a comprehensive geotechnical investigation to assess the foundations and guide any repair and strengthening works.
The institution has further advised that stormwater around the buildings be properly managed to prevent water from collecting around foundations.
For now, IEK has recommended that Blocks M, N and P remain vacant until repair and strengthening works are safely completed.
The engineers have also urged residents in other blocks to report any new or widening cracks, sticking doors or windows, or water pooling against walls to the management and county authorities for assessment by a qualified professional engineer.
IEK said the situation highlights the importance of engaging qualified and licensed professionals throughout the design, construction, inspection and completion of buildings, warning that failure to comply with construction and professional requirements can put lives and property at risk.
