Steel structure manufacturer since 2009 · 8 fabrication bases in China
Floor & Envelope
Roof and wall cladding, supplied with the frame it fits
Cladding is where a steel building leaks, sweats or burns. The panel core sets the fire class, the coating sets the life, and the details set whether it leaks. We size purlins and girts for the panel you choose and supply the flashings from the same model.
0.4–0.8 mm
Sheet thickness
50–200 mm
Panel insulation
PU / PIR / RW
Core options
Full kit
Gutters, flashings, skylights
Panel options
Which cladding for which building
| Type | Insulation | Best for |
|---|---|---|
| Single-skin profiled sheet | None | Open sheds, warm climates, budget stores |
| Sheet + glass wool + liner | Good | Warehouses needing moderate insulation |
| Sandwich panel (PUR, PIR or stone wool core) | Very good | Cold stores, food plants, offices, fire walls |
| Standing seam roof | With insulation layer | Long roofs, low slopes, few penetrations |
Sandwich panel cores
Fire class and insulation by core
Sandwich panels are covered by EN 14509; reaction to fire is classed to EN 13501-1.
| Core | Reaction to fire (typical) | Fire resistance | Thermal conductivity |
|---|---|---|---|
| PUR (polyurethane) | D-s3,d0 to B-s3,d0 | Low | 0.023 W/m·K |
| PIR (polyisocyanurate) | C-s1,d0 to B-s1,d0 | Limited | 0.018 W/m·K |
| Stone wool | A2-s1,d0, non-combustible | Up to EI 240 by thickness | 0.039 W/m·K |
Values from a stone wool panel manufacturer’s technical guide; the exact class is on each product’s declaration of performance. Insurers may also require FM 4880 approval.
Rule of thumb: PIR insulates best per millimetre; stone wool is the only core that is non-combustible. Fire walls and plants with strict fire codes usually need stone wool.
By climate
What changes in hot, humid and coastal sites
Hot climates
Reflective coatings and insulation cut heat gain; ridge vents release hot air.
Humid tropics
A continuous vapour control layer stops condensation dripping on goods.
Coastal sites
AZ150 or higher metallic coating and PVDF top coats resist salt.
From our engineers
Where steel roofs leak, and how we detail them
Laps on low slopes. Through-fixed sheet needs enough slope and sealed laps. Below about 5° we recommend standing seam.
Penetrations. Every pipe and fan through the roof is a leak path. Group them and use factory flashings.
Gutters. Box gutters are sized for local rainfall intensity with overflows, not just to match the eave.
Thermal movement. Long sheets expand. Fixings and clips allow it, or fasteners loosen and leak.
Accessories
Supplied with the panels
- Ridge caps and flashings
- Box and eave gutters
- Downpipes
- Skylight sheets
- Ridge ventilators
- Louvres
- Self-drilling fasteners with washers
- Sealants and foam closures
Which sheet coating should I choose?
Galvalume (AZ) with polyester paint for most sites; PVDF or higher AZ coatings for coastal or industrial exposure.
How do I avoid condensation?
Insulation with a continuous vapour barrier, plus ventilation. We specify both with the panel.
Which panel brands do you supply?
Panel and coil brands to be confirmed.
Do you supply doors and windows?
We frame the openings and can supply roller doors and windows on request.
Cladding quote
Send roof and wall areas, climate and fire needs
We propose a panel system and size the purlins to it.