Commercial flat roofing worked examples
Three worked specifications showing how reading the roof from the deck up leads to different systems depending on the building, the loads and the falls. They illustrate the method: none is a completed project, a named client or a past job.
This site is published by SEO Dons, which does not carry out roofing work, so it has no completed projects to show and does not invent them. What it can show is how a sound specification is reasoned: what the survey has to find, which system follows from the evidence, and which standards and regulations apply. Each example below is written as guidance for a building owner, not as a record of a job.
The three examples cover the routes most commercial roofs take: a full strip-and-recover where the insulation is wet, a liquid overlay where the existing roof is sound but tired, and a re-roof engineered for a future rooftop solar array.
Re-roofing an industrial unit for a future ballasted solar array: a worked specification
A profiled-metal-and-felt roof near the end of its life renewed to a single-ply warm deck, with residual structural capacity confirmed so a future ballasted solar array can be added without disturbing the membrane.
Mechanically-fixed single-ply, warm deck, structurally checked for future ballasted PV
Read the worked example → Worked exampleCold-applied PMMA liquid overlay on an office and plant deck: a worked specification
A detailing-heavy 1990s office and plant deck waterproofed with a cold-applied PMMA overlay: no hot works over occupied offices, every upstand and penetration dressed seamlessly, and no strip.
Cold-applied PMMA liquid-applied waterproofing, overlay
Read the worked example → Worked exampleStrip-and-recover to PVC single-ply on a distribution warehouse: a worked specification
How a ponding felt roof over a distribution warehouse is stripped back to a sound deck and recovered with a mechanically-fixed PVC single-ply warm deck, phased so the building stays in use.
Mechanically-fixed PVC single-ply, warm deck with tapered insulation
Read the worked example →What the three examples show
The common thread is that the survey decides the system, not the other way round. Wet insulation and missing falls rule out an overlay and point to a strip-and-recover. A sound deck with dry insulation and only an aged surface points to a liquid overlay. A roof that will later carry solar should be renewed first and engineered for the future load. See the how it works page for the survey-to-sign-off method behind all three, or the repair or replace page for the decision each one turns on. For a costed condition report on your own building, request a quote.