Not all scaffolders are qualified to carry out shrink wrapping. But with training and certification, one can take it on. The job requires techniques, and this guide will walk you through what to expect.
How to Weld Shrink Wrap
Welding is when you bond two sheets to create a sealed join that’s strong enough to hold once the wrap is shrunk.
- Fuse two sheets together to create a sealed joint that holds tension and prevents gaps.
- Start by overlapping the sheets at least 30 cm. Warm a section using the shrink gun until soft (about 2 to 3 seconds per spot.
- While warm, gently pat the layers with the back of a gloved hand. Continue heating and pressing along the entire join without any gaps.
For a stronger weld, run a second light pass of heat along the join and smooth it out.
How to Tape Welds
You add tape when a weld – the overlapped area you heat-fuse together – needs extra hold or when the edge is exposed.
- Add tape along the edge to make it stronger and neater.
- Put the tape on while the weld is warm and press it down with a gloved hand.
If the tape doesn’t stick, give it a light pass of heat, just enough to help it settle.
How to Shrink the Wrap
Welding and shrinking aren’t the same thing. Welding seals two sheets together. Shrinking tightens the entire cover. This is the part that makes the wrap look clean and drum‑tight.
- Start at one end and work evenly across the surface.
- Hold the heat gun 20 to 30 cm from the wrap.
- Keep the gun moving; never hold it in one spot.
- Watch for changes: the wrap becomes smooth and glossy when shrinking.
Do not overheat and chase crinkles by blasting one area too long. Instead, heat evenly and let the wrap settle. If wrinkles persist, wait for the wrap to cool, then try again.
Two Welding Techniques Scaffolders Use
Shrink wrap welding can be done in two ways. Scaffolders switch between these methods based on the job and how strong the join needs to be.
Outside heating
You heat the outer layer first, then press it onto the inner layer. This is the quicker method and works well for general joins.
Inside heating
You heat the layers for a stronger bond, then press them together. This technique gives a tighter and firmer weld. It’s good for areas where the sheet takes more tension or wind load.
Most scaffolders use a shrink gun for welding. It gives them better control over the heat and overlap. A shrink torch can still come in handy on big areas or when you need faster heat. However, it operates at much higher temperatures, so it must be used carefully to avoid overheating or damaging the wrap.
Quality Checking
When you’re done, the wrap should be smooth with no wrinkles or bubbles. Give the surface a tap, and it should sound tight like a drum.
If you notice holes, thin patches, or areas that feel soft, cover them right away with a protection tape like a shrink wrap patch tape to keep the wrap sealed and secure.
Shrink wrap & accessories are available on our website. For product enquiries and fast quotes, email our team at customercare@s-pgroup.com or call 028 9411 0032. SP Group is a temporary protection and scaffold supplier based in the UK and Ireland.