Industrial roofs: compare sheet, sandwich panel and built-up solutions

Record operating temperature, moisture, dust and production-related substances. Assess an unheated store differently from a workshop or cold store. A coating suitable for dry storage may not suit an aggressive industrial environment of similar floor area.

Provide location, plan, slope and purlin spacing, marking rooflights and equipment. The hall outline alone cannot determine sheet thickness or screw quantity. Openings and services form part of the information needed for structural checks.

Consider single-skin covering for shelters and suitable unheated buildings. T18 and T35 differ in profile height, but height alone does not determine capacity. Confirm thickness, steel grade, supports and the exact sheet’s data.

Assess condensation beneath steel and the moisture sensitivity of stored goods. An anti-condensation fleece can retain some water but needs drying conditions and is not thermal insulation. Fleece without suitable ventilation does not guarantee drip prevention.

Two facings bonded to a core combine weather protection, insulation and an internal surface in one element. This can simplify heated-hall construction. Panels still require supports, fixings and proper joints; they do not replace the entire structural system.

Consider PIR for thermal performance at limited thickness and mineral wool in relation to fire or acoustic requirements. Check the product and installed assembly classifications. A core property is not the classification of the whole roof.

In a built-up roof, deep trapezoidal decking may support vapour control, insulation and waterproofing layers, selected separately. Structural decking has a different role from façade cladding and requires appropriate load tables and project-specific calculations.

Include layer weights, snow, wind suction, equipment, deflection and supports. Large openings may need separate framing. Do not accommodate service changes by arbitrarily cutting the finished roof; submit them to the designer before ordering materials.

Check minimum slope for the actual joints and rooflights. Continuous panels may have different requirements from end-lapped sections. Do not confuse percentages with degrees: 5% means a 5 cm height change over 1 m horizontally.

Position drainage for catchment area and roof length. Avoid ponding and provide emergency overflow where required by the design. Ensure cleaning access to gutters, outlets and rooflight details before equipment restricts access.

Place fans and solar equipment on the plan before dividing panels. They introduce loads and penetrations, sometimes requiring separate support. Cutting part of a complete element changes its behaviour; do not assume its original capacity remains unchanged.

Design routes to inspection points, accounting for local loads from people and tools. Access arrangements must suit the system. Retain support and fixing documentation for later expansion so additional equipment is not installed on assumptions.

Break quotations into layers, supports, fixings, flashings, transport and labour. Other layers may be additional to a sheet price, while panels can reduce installation stages. Equivalent scope reveals the real cost difference and work remaining after delivery.

At handover, compare materials with the design and check fixings and opening flashings. Remove swarf and film, and record coating repairs. Collect product and maintenance documents and confirm a safe inspection route before more roof equipment is added.