Fibre-cement roofing for an unheated warehouse

Check how much moisture arrives with deliveries, vehicles and the materials themselves. The choice of roof alone cannot establish the storage climate. Particularly sensitive stock may need additional protection regardless of whether the warehouse is heated.

Roof and air temperatures vary throughout the day. Water vapour can condense on cooler surfaces. Fibre cement can temporarily absorb some moisture, yet droplets can still form. Assess the actual air exchange before closing openings against wind-driven rain. Record whether wet patches follow rainfall or appear in dry weather. A leak and condensation have different causes and require different repairs.

Design the airflow for the storage conditions. Open doors provide an intermittent air change, and racks or stockpiles can obstruct planned flow paths. Identify inlets, outlets and areas that need monitoring. Keep a ventilating ridge open as designed and provide weather protection appropriate to the building’s exposure. Resolve these two functions together.

Tell the structural designer how often large doors stay open during operations. Openings affect wind loads and air exchange. Fibre-cement sheets need supports and fixings designed for these conditions, with a separate assessment of edge zones where necessary. A fixing layout from a smaller enclosed building may be unsuitable. Review the assumptions if the operating pattern changes after handover.

Position rooflights for the aisles and tasks while limiting direct sunlight on sensitive goods. A rooflight that matches the corrugation still needs compatible supports, fixings and weather seals. Treat translucent panels separately in the maintenance plan. A matching profile gives no assurance that a panel can carry a person or equipment.

Plan to cordon off the area below a damaged sheet and move stock safely. Local replacement can require adjacent connections to be opened. Keep the sheet profile, fitting and fastener details and delivery dates. Check that high fixed racks leave enough room for access equipment. Otherwise a small repair could interrupt work across the warehouse.

Inspect the eaves, ridge and penetrations from safe positions without walking directly on the sheets. Note the weather and operating conditions when damp marks appear. Actual storage or ventilation may differ from the design assumptions even where the roof is sound. Check drainage as well. A blocked gutter and moisture condensing below a roof slope call for different action.

Specify the stock, moisture sources and normal door operation before choosing a roof. Use those conditions to plan the covering, ventilation and maintenance access.