- roof area must be properly cleaned off debris and saw dust before installation of the metal roof. Otherwise, there is a risk of capillary action.
- In order for the PREFA roof covering to fulfill its function, PREFA roof coverings may only be walked on by competent persons. In order to prevent technical or visual damage to the roof covering (e.g. damaging seams, indentations) by third parties, additional measures, such as walkways, are necessary.
- Do not bend folds.
- The length ofprefabricated flashings should not exceed 3,000 mm. Do not make a firm connection at the joints, otherwise there is no possibility of expansion.
- For roof tiles, R.16 roof tiles, shingles, DS.19 shingles, rhomboid roof tiles 29 × 29, rhomboid roof tiles 44 × 44 and FX.12 roof panels, only process the edging or end strips made from PREFA supplementary coil (P.10). This is the only way to ensure colour consistency in the long term.
- In order to avoid colour differences, batches should not be mixed on individual surfaces.
- You will need longer grooved nails (e.g. 2.8/40) for PREFA coverings over thicker layers of bitumen or if using a thicker bituminous underlay or membranes longer ring shank nails might be necessary Please state this separately when ordering.
- There is no need to paint over or touch up scratches on coil-coated aluminium products due to the corrosion resistance of aluminium. When touching up scratches, there may be colour differences due to different paint qualities of the touch-up paints/pens.
- Be sure to observe and control all safety measures before starting your work.
- Use a deck aid and take all other safety measures into account, such as roof safety hooks that may be required.
- In the case of powder-coated products, cracks and damage to the coating must be expected during forming (e.g. expansion of pipes).
