Horizontal or vertical wall panels – which layout is easier to maintain?

Being able to turn a panel on site tells you little about whether it will work in that position. Each panel has an outer and an inner face, and its interlocking joint engages in a particular way. Show the panel direction and installation sequence on the drawings so the installer can fit the flashings and seals as intended.

Vertical panels usually span between horizontal side rails. For horizontally laid panels, the vertical supports and the end joints where panels meet are particularly important. The design loads and the capacity of the chosen panel determine the support spacing. Either layout may require more framing on a particular building.

On an existing building, the frame may favour one panel direction. Check its condition and load capacity first. Changing direction may mean adding rails or altering the supports. Include this work alongside the panels and flashings when costing the two layouts.

Continuous rows of windows may suit horizontal panels, while tall areas between vehicle doors can suit vertical ones. These are visual considerations. Draw the cuts, joints and opening surrounds to check how each layout would actually be built.

Check that a short panel above a doorway has enough support and can be secured properly. Splitting a wall into many small pieces leaves more details to maintain. Moving an opening slightly can sometimes simplify the layout and reduce offcuts while preserving the use of the room.

Both orientations rely on correctly assembled interlocking joints, seals and flashings. With horizontal panels, pay particular attention to end joints over vertical supports. With vertical panels, detail the top and base of the wall and any end joints where one panel continues above another.

Weathertightness depends on the system and workmanship in either direction. In rooms that are washed down, inspect the joints and trims from the inside too. Cleaning water must be kept away from exposed panel edges.

Horizontal joints can emphasise the length of a building, while vertical joints draw the eye upwards. The facing profile and the direction of daylight also affect the finish. For metallic coatings, keep panel orientation consistent and check material batches. A panel turned around by mistake can appear to be a different shade.

View a sample or the first completed section from several angles, especially when sunlight strikes it from the side. Small surface irregularities become easier to see. Agree the expected appearance at this stage, before the protective film comes off the last panels.

Along forklift routes, the base of the wall is particularly vulnerable. With horizontal panels, a repair can sometimes be confined to the lower course, depending on the joint and fasteners. With vertical panels, damage near the floor may affect one long element. Consider this alongside the other criteria when choosing the layout.

Ask the supplier to explain the actual removal sequence. Concealed fixings may require neighbouring panels to be removed first. Consider impact barriers along vehicle routes to prevent repeated damage to the same part of the wall.

Compare panel quantities, offcuts, framing, flashings and access for installation. Longer panels can reduce the number of joints but may be harder to transport and replace. Shorter panels are often easier to handle on a confined site and can require more joints.

Allow for future openings and building services. Choose a panel direction that suits both the architecture and the building’s use. Keep the approved panel layout and detail drawings. They will show how to reinstate the wall during later alterations, including details hidden behind the visible facade joints.