Using T7 trapezoidal sheet to refurbish soffits, gates and fences

Check fence posts, frames and connections for corrosion before fitting new infill. A solid fence panel takes wind differently from an open fence. Likewise, closing an open space beneath the eaves may change the airflow. Review the performance of the whole assembly when planning the refurbishment.

One façade version has a 7 mm profile depth, a cover width of 1,175 mm and an overall width of 1,197 mm. Available steel thicknesses include 0.5 and 0.7 mm. For those thicknesses the recommended maximum lengths are 6 and 7 m respectively. The minimum length in this range is 0.5 m.

Other sheets sold under a similar name may have different cover widths or side edges. To extend old cladding, compare rib shape and pitch. Use the load data for the actual section to determine support spacing and the required fasteners. The number in the profile name does not supply these figures.

For a straight 5.80 m run and a cover width of 1.175 m, five sheets give 5.875 m of cover. Trim the edge strip to fit. With each sheet 0.80 m long, the effective area ordered is 4.70 m² for a rectangle measuring 4.64 m². The calculation excludes flashings and installation clearances.

Soffit corners introduce angled cuts and changes of direction. Draw each field and mark the visible face to see which offcuts can be reused. Where the roof takes ventilation air through the eaves, keep the designed inlets and their effective open area. Include suitable vented components in the soffit layout.

Provide level supports suited to the shallow profile. Trying to flatten a sheet by overtightening a screw can distort the pan or damage the protective coating at the hole. Select fasteners for the substrate and loads. A solid gate may have different requirements from a soffit.

Support long sheets while carrying them to prevent bending or twisting. If the entrance or installation area is cramped, agree a layout with shorter lengths and suitable end details. Cover sharp edges wherever people can reach them or equipment may catch on them.

Splashback reaches the bottom of a fence. Dirt, salt and wet leaves can hold moisture against the surface. Leave clearance above ground and room for cleaning. Keep soil and gravel away from the sheet. Shape the bottom trim so water drains out freely.

Check the swing of the gate and movement of the frame. The infill needs clearance from the paving and adjacent parts throughout its travel. Keep fixing points accessible for inspection. If the new infill is heavier, check the hinges and frame for the additional load.

Record the profile section, sheet thickness, coating and colour. Photograph the layout before closing the trims. If a sheet is dented or scratched later, the record helps identify the part and the dismantling sequence. Check the joint against the original when sourcing a replacement years later.

At each inspection look for deposits, impact damage and loose fixings. Use cleaning products suitable for the coating and promptly remove swarf left by other work. A small scratch may need only a compatible touch-up after preparation. If damage recurs at the same point, check what strikes or rubs against it in use.