Who checks roof flashing skills in Hargeisa?

Leaks at junctions often start at the flashing detail, not at the roof sheet itself. Roof flashing skills gaps in Hargeisa show up wherever the sheet meets a parapet, a valley, a pipe or a wall, because those details demand cutting, folding and sealing that a general roofer may never have practised. The person holding the trowel decides the outcome, so the question is who checks that person before the work starts.

Where do roof flashing skills gaps show up on a roof?

Flashing is the metal or membrane strip that carries water across the joint between roof surfaces and everything that interrupts them. A gap appears when the person fitting it copies a habit from a different detail. Skills gaps show up at junctions such as parapets, valleys, pipes and walls, wherever the work is done. On a parapet, the strip may be laid flat against the wall with no upstand and no counter-flashing, so wind-driven rain runs behind it. In a valley, sheets may overlap in the wrong direction, or the flashing may stop short of the outlet. Around a pipe or vent, the collar may be pushed down without a bead of sealant under the flange. These are workmanship defects, not material failures, and each one leaves a path for water that only shows after the first heavy rain. Ask the roofer to describe the lap direction and the upstand height for each junction, then ask how that matches the project's specification.

How do you test practical competence before work starts?

Practical competence is proved by a sample, not by years on site. Ask for one full-scale junction sample on a small frame: a parapet upstand, a valley, and a pipe penetration, built with the same sheet, flashing and sealant planned for the roof. Then pour water over the sample and watch the underside for ten minutes. A roofer who cannot explain why the upstand turns into the wall, or who seals a lap with mastic alone, will fail the sample. Check the tools too: a hand seamer, a nibbler or snips, a folding bar, and a sealant gun that is actually used. Ask for the name of a recent building where the same crew set the flashing, and walk that roof if the owner allows. None of this requires a laboratory, only an hour and a hosepipe. Confirm fixing centres and lap dimensions against the project's specification or the sheet manufacturer's installation guide, because those are general practice figures that vary by profile.

What should a supervisor watch at the junctions?

A supervisor catches flashing defects by standing at the junction when it is built, not by inspecting the finished roof. Watch the order of work: substrate clean and dry, flashing set before the next sheet covers it, fasteners through the flashing into a solid fixing, not into thin air. Look for the upstand height above the finished roof surface and for a drip edge that throws water clear of the wall. Check that sealant sits under a flange or inside a lap, not smeared over the top as a cosmetic bead. Where the roof meets a wall, ask whether a counter-flashing or reglet is required and who builds it. If the crew cannot show the detail on the drawings, they are working from memory. Ask the municipal engineer's office whether it holds roof junction details or inspection records for comparable buildings, and whether any permit stage requires a roof inspection before ceilings close.

What to do next

Ask the roofing contractor to build one full-scale parapet upstand and one pipe penetration sample this week, then water-test both in front of you. If either leaks, ask for a second sample from a different crew member before signing anything. Record the result, the date and the name of the person who built it, and keep the photos with the contract documents.