Standing Seam, Sandwich Panel & Skylight
A standing seam roof is made of long metal panels joined along raised seams and held down by hidden clips, with no screws through the roof surface. It suits large industrial and commercial roofs that must stay watertight in heat.
Drawings or a written scope is enough to price it.
Standing Seam Roofing
In Qatar’s heat, how a roof is fixed matters more than its colour.
A roof sheet here expands through the day and contracts at night. Standing seam lets the sheet slide on its clips instead of pulling against screws. Masas installs it alongside sandwich panels and skylights, on frames it fabricates and on frames supplied by others.
Standing Seam Roofing
It is a metal roof made from long panels that run from the ridge, the top of the roof, down to the gutter. The edges of neighbouring panels are turned up and joined into a raised rib called the seam. Clips hidden inside the seam hold the panels to the steel below, so nothing passes through the surface that keeps water out.
The more common alternative is a through-fixed roof, where each sheet is screwed down through its face. Every screw is a hole sealed by a washer. When the roof moves every day, the sheet keeps pulling against screws that cannot move with it. Over the years the holes wear oval, the washers stop sealing and the fixings begin to leak.
Standing seam avoids this because the clip lets the panel slide as it warms and cools. It is most useful on long roof runs, which move the most, and on low-pitched roofs, which drain slowly and forgive leaks less. On a small, short or steep roof, a through-fixed roof can still be a sound choice.
Warehouses and factories with long, low-pitched roofs
Buildings where a leak would damage stock or production
Roofs with skylights installed in the same package
New roofs on Masas frames or on frames by others
Before you decide
Three things shape the design and the price. All three are usually known early, well before anyone has to commit.
The length of each roof run sets how far the panels move, and the pitch, the roof’s slope, sets how fast water drains. A long, shallow roof on a building meant to last is where standing seam earns its cost. Compare prices against these facts, not per square metre alone.
Every opening breaks the roof surface and needs its own flashing. Standing seam has few openings, so each can be detailed individually, but each still matters. Skylights installed with the roof, under the same subcontract, are detailed together with the seams around them.
Clips fix to purlins, the light steel beams running across the roof frame. If the purlins are out of line, the roof will not sit true and the fixings come under strain. Where Masas builds both frame and roof, their fit is settled before fabrication rather than argued after.
Plain terms
Standing seam quotations use a handful of specific terms. Knowing them makes offers easier to compare.
The raised joint where two panels lock together. Because it stands above the flat of the roof, water runs past it rather than through it. Seams are closed on site as the panels are laid.
The concealed bracket that holds a panel to the steel purlin beneath. Sliding clips let the panel move lengthways as it expands. The type and spacing of clips also decide how well the roof resists wind trying to lift it.
The place along each panel where it is deliberately locked in position, so that all movement happens away from it in a controlled way. Without a planned fixed point, the roof finds its own restraint, usually somewhere unhelpful.
A folded metal strip covering a joint the panels cannot close themselves: at the ridge, the roof edges, walls, skylights and pipes through the roof. Because the panels have no holes, this is where most detailing effort goes.
The roof follows the same approval and inspection stages as the steel frame beneath it.
01
You send the roof plan and details. Masas confirms in writing the roof area covered, the skylights and flashings included, and whether the frame is its own or supplied by others.
02
Shop drawings, including the roof layout and flashing details, go to your consultant with the method statement, inspection and test plan and risk assessment, for approval against QCS 2014.
03
Panels, clips, flashings and fixings are prepared and inspected against the approved plan before they go on the roof, so what is installed is what the consultant approved.
04
Installation is sequenced with the main contractor’s programme, with skylights installed together with the roof. Snagging, as-built drawings and the certificates your consultant needs close the package.
For a quotation
Drawings showing the roof area, the length of each roof run from ridge to gutter, and the pitch. These set the panel lengths and the movement the roof must allow for.
The positions and sizes of skylights, extract fans, vents and service pipes, so that each opening can be priced with its own flashing.
Whether Masas or another contractor supplies the steel, with purlin drawings if the frame already exists or is designed by others.
Where the building is, for example near the coast, and how long it is meant to last. Both affect the choice of panel material and finish.
Record
Projects under Masas's standing seam, sandwich panel and skylight line. The record names the line, not the system on each job, so ask which references used standing seam.
Design, fabrication and erection supervision for eight buildings in a single retail plaza — a repeated structural bay with architectural steel exposed to a public promenade and to coastal conditions.
View projectDesign, fabrication and erection of the plant building. A bottling hall is a wash-down environment, which governs the cladding and the detailing at every junction.
View projectEngineering, fabrication and erection of a food storage building, with the envelope detailed for a temperature-controlled interior.
View projectEngineering, fabrication and erection of a cold store building. The insulated envelope is the product here — a thermal bridge at a purlin line is a defect, not a detail.
View projectEngineering, fabrication and erection of a food processing building, detailed for a hygienic production environment.
View projectThe other parts of this service, each on its own page with its own evidence.
Send drawings or a scope and we will come back with a quotation.
