Repairs, doors and handover
Hoorah, the job is finished, lets just head off shall we? Not so fast! At the end of the job you need to inspect. What are you looking for? Are all the overlaps and joints completed heat welded? Is the sheet properly heat shrunk? You can tell this by hitting the sheet – it should sound tight and taught, like a drum, when you hit it. There shouldn’t be any creases or wrinkles and there certainly shouldn’t be any evidence of creases left in the wrap when it was folded on to the roll.
Small Repairs to Scaffold Shrink Wrap Sheeting
Even the most experienced shrink wrap installer will make the occasional hole in the sheeting during the welding or shrinking process. To repair small holes after heat shrinking you should use a white ‘patch tape’ so that the repair is almost invisible. Although this should be avoided, the shrink wrap repair tape is also used to tape around any locations where a scaffold tube is protruding through the shrink wrap sheeting. A typical roll of shrink wrap repair tape or patch tape is 100mm wide and it is generally supplied on a 33m long roll. It is important to use a tape with a high tack adhesive that will stick to the shrink wrap at low temperatures.
Large Repairs to Shrink Wrap for Scaffolding
One of the benefits of shrink wrap sheeting for scaffolding is that it is possible to make a completely sealed repair, even to large areas. Once complete, a shrink wrap repair should be as strong and tight as the original scaffold cladding.
Because the tight and moulded ‘drum tight’ fit of shrink wrap makes it far less likely to flap and detach accidentally from the scaffolding in strong winds, a repair to shrink wrap is more typical after the sheeting has been deliberately cut open – perhaps to allow construction materials to be craned in.
To repair a large ‘hole’, first cut a new piece of shrink wrap film which is big enough to allow an overlap around the damaged area by 40-50cm. You will probably find it easiest to use some small pieces of tape to temporarily hold the patch in the required position. Next use the shrink wrapping heat gun to weld the shrinkwrap ‘patch’ to the existing sheeting. (See ‘welding’ above). The overlapped area between the patch and the existing sheeting should be completely welded; You may fit it easiest to first direct the heat from the shrink wrapping gun between the two pieces of film that are to be joined. Once you have heated the shrink wrap film nearly to it’s melt point, press the two pieces of film together and then immediately direct more hot air from the shrink wrapping gun over the welded area from the outside. As with all shrink wrap welds, the finished joint / weld between the sheets should be smooth and wrinkle free without any air bubbles or flapping edges.
Once the shrink wrap patch has been welded into position, the patch itself can be heat shrunk ‘drum tight’ as normal. (See ‘shrinking’ above).
Making a repair is one of the few occasions when we recommend using the shrink wrap repair tape or patch tape to tape over the edge of the welded area. For best results, the area that the patch is being applied to should be clean and dry.