How do you check vertical extension skills in Burao?

Vertical extensions skills gaps in Burao appear when a crew that builds single storey walls is asked to add a floor to an existing building. The new floor sends load down walls and footings that nobody has measured. A bricklayer can be skilled at laying block and still not know how to expose a footing, read the concrete, or decide whether the existing wall can carry another storey.

Why does a vertical extension need different skills?

A vertical extension is not a new build stacked on top. The existing structure carries the new load, so the crew must assess it first.

General practice is to expose the footing at a trial pit, measure its width and depth, and check the concrete. The engineer then compares the founding material and footing size against the loads the new floor adds. A crew without that habit will build straight off the wall plate.

Ask the relevant municipal or district office whether any records for the plot exist, such as borehole logs or approved drawings. Ask the owner for any original drawings, previous test results and records of earlier repairs. Where no records exist, the engineer decides how many trial pits and probes are needed.

Tying new walls to old, setting dowels into existing columns, and checking verticality over two floors are separate skills from ground floor work. So is reading the crack pattern in the old wall and deciding whether it is settlement, thermal movement or a failing lintel. These checks come before the first block is laid.

How do you detect the gap before work starts?

Ask for evidence of one similar job that the same crew completed, then walk that building.

Look at how the extension meets the old wall. Check for a straight joint, a movement gap where the engineer specified one, and cracks that have opened since handover. Ask the owner whether the earlier job leaked or cracked. Ask which engineer supervised it.

Interview the site agent, not the company owner. Ask how the crew would expose a footing without undermining the wall, how they would tie a new column to an old one, and what they would do if the trial pit showed soft ground. A competent agent describes steps and call points. A weak one gives general answers.

Request material test records for the existing concrete if any exist, or a rate for testing cores from the engineer's chosen laboratory. Check what the contract says about who pays for investigation work. If the tender treats investigation as an extra, expect the crew to skip it.

What does the gap do to the finished work?

Unverified existing capacity shows up later as cracks, settlement and water paths into the building.

If the footing is narrower than assumed, the added load can settle one side of the building. That opens diagonal cracks through the new floor and pulls apart the joint with the old wall. A crew that never checked verticality may leave the upper floor out of plumb, which throws door frames, block courses and the roof line.

Where the crew does not dowel new work into old, the two move separately, and rainwater finds the joint during the Gu and Deyr rains. Exposure conditions vary from site to site, so ask the structural engineer and the project specification what cover and lap lengths the new reinforcement needs before the steel is fixed.

Ask the structural engineer to set hold points: footing exposed, dowels inspected, first lift of blockwork checked for plumb, slab reinforcement inspected before the pour. A hold point only works if someone from the client's side attends and signs it off. Confirm the required cover, lap lengths and concrete grade against the project specification, not a rule of thumb.

What to do next

Before signing, ask the contractor for one completed extension that the same crew built, and for the engineer who supervised it. Visit that building, photograph the joint between old and new, and ask the owner about cracks. Then ask your engineer to list the trial pits and hold points for your own plot, in writing, before work starts.