How Should I Set Up A Scaffold Structure For Shrink Wrap?

What Is The Best Way To Set Up a Scaffolding Structure For Shrink Wrapping?

Rhino Shrink Wrap sheeting is a versatile covering for scaffold structures of any dimension or shape. However, following the guidelines on this page when the structure is being erected will make the shrinkwrap covering easier to install, more effective, and a professional appearance. Preparation is the key!

These notes are intended as a general guidance to setting up a scaffolding structure to get the best result from your shrink wrap sheeting. However, as with all types of scaffold sheeting, always seek the advice and guidance of a qualified scaffolding designer to ensure that your structure can withstand the additional wind loading that will result from the application of sheeting.

Scaffolding must be complete and inspected prior to shrink wrap installation

Introduction

A scaffold which is to be shrink wrapped should be erected in line with the NASC’s TG20:13 guidelines. As of June 2014 it is the only guidance that is acceptable to the Health and Safety Executive. TG20:13 has been issued as the industry technical guidance on the use of the European Standard BS EN12811-1 and applies to all tube and fitting scaffolds.

It may seem obvious, but the first thing to consider is that shrinkwrap sheeting requires a support structure wherever the weather protection and / or containment is required. You might be surprised how many times we are asked to fix sheeting to an area where there is no scaffolding to attach to!

Fully boarded access, complete with handrails, is required to every part of the scaffolding that requires sheeting. The scaffolding should be complete and inspected (Scafftagged) prior to shrink-wrap sheeting installation.

It is the responsibility of the client / scaffolder to ensure that the scaffold is designed & built to withstand any wind loadings resulting from scaffold sheeting. (This is the case with all types of sheeting – ‘Monarflex’, shrink wrap etc)

Protrusions

Apart from having a huge impact on the appearance of your shrink wrap scaffold sheeting, a scaffolding with lots of protrusions will slow up the daily installation rate. It will be hard to get the sheeting straight and although cutting around protruding tubes is a relatively quick process, resealing and taping around tubes can be time consuming.

Alternatively, a flush scaffolding with dedicated sheeting rails can make the daily installation rate much faster. The amount of shrink wrap sheeting that can be installed in a day has an affect on the price. For more information on shrink wrap pricing / costing factors click here.

Ledgers

Ledgers should be flush with the main body of the scaffolding. Although it is possible to cut shrink wrap around a protruding scaffold tube or scaffold board (and then tape / heat weld the shrink wrap back together) this can make fitting the shrink wrap very time consuming and will not look very tidy. Furthermore, even after resealing the shrink wrap around a protruding scaffold tube it is going to be very difficult to achieve 100% containment or weather protection.

Handrails

Handrails should be installed so that they are flush with the main body of the scaffolding. Sometimes a handrail will be used where a horizontal join between sheets of shrink wrap is required.

Standards

Standards should be flush with the main body of the scaffolding.

Boards

Scaffold boards should be flush with the main body of the scaffolding.

Protrusions through shrink wrap sheeting

Flush tube and fitting scaffolding structure

Heat shrunk sheeting around scaffold fittings

Sheeting rail used on edge of small temporary roof

Sheeting rail to hold wrap away from fittings

Sheeting rails

A sheeting rail, installed every other scaffolding lift, can improve the appearance of a shrink wrapped scaffolding by holding the sheeting away from scaffold fittings. Although the shrink wrap is shrunk ‘drum tight’ so that it moulds very tightly around fittings, over long periods of time, in windy locations, fittings can start to cause holes in the sheeting. Although these can easily be repaired using shrink wrapping repair tape, a sheeting rail can help to prevent holes.

Final seal

Final seal is required for projects that require total containment. It is particularly important that the scaffolding structure is flush and protrusions are minimised. A scaffold tube should be installed parallel to and as close to the ground, wall, ceiling etc. The main body of the shrink wrap sheeting will be secured to this tube. A shrink wrap skirt will then be welded / taped between this tube and sealed to the floor / wall  / ceiling using wooden batten or adhesive.

An alternative technique is to put scaffold boards on the ground and build the scaffold on top. The shrink wrap sheeting can then be battened to the boards at ground level and provide an effective final seal.

Final seal

Joining Shrink Wrap Sheeting (Scaffolding)

Horizontal join (viewed from outside)

Horizontal joints between sheets

Shrink wrap sheeting is normally supplied as a 7m wide x 15m long roll. Although it can be hung any way up, the usual process is to use the 7m width of the sheet to cover 3 ‘lifts’ of the scaffolding. 3 lifts is the largest ‘drop’ we recommend. For some projects, it may be preferable to reduce the drop to 2 lifts or even 1 lift if very high wind speeds are likely.

When shrink wrapping scaffolding that is higher than 6m, it is therefore necessary to make a horizontal join between sheets. The most robust way of making this join is to run a double scaffold tube around the scaffolding at the height where the join is required (approximately every 6 metres). The double tubes should be positioned close together, (5-10cm is ideal).

Sometimes the double tube of the scaffolding handrail is used as a horizontal joining point for shrink wrap. This is acceptable, however, because hand rail / guard rail tubes can be up to 47cm apart, this can lead to more shrink wrap film being used than is strictly necessary to complete the job.

In this way, each section of shrink wrap is attached separately to the scaffolding structure and each one is fitted behind the other (like tiles on a roof).

Want to learn more about creating horizontal joints between shrink wrap? Watch the video below.

Where do you want the scaffold sheeting to end?

Shrink wrap scaffold sheeting needs to be secured before it is heat shrunk ‘drum tight’. Install a ledger at the point where the shrink wrap sheeting is to finish. A handrail can be used for this purpose.

Bottom ledger

Temporary roof

Temporary Roof Structures

Shrink wrap sheeting can be used as a temporary roof covering, either to provide temporary weather protection or environmental containment to a construction project.

To shrink wrap a temporary roof safely you should bear the following points in mind;

General points;

Any roof scaffolding which is to be shrink wrapped must be constructed to allow rainwater to drain easily from the roof surface. The minimum pitch of a shrink wrap temporary roof scaffold should be 10% or 1:10.

The installation of shrink wrap sheeting to create a temporary roof will require the installer to access the top surface of the roof. For this reason it is important to set up a handrail around the roof edge / perimeter of the roof. The handrail provides edge protection to the installers and allows the installers to set up and tension safety lines between handrails if required. (NB that where safety lines are used, it will also be necessary to have a rescue plan and operatives trained in the use of casualty recovery equipment such as the ‘Gotcha’ rescue kit by Spanset – spanset.co.uk)

Having a handrail around the roof edge does not cause significant problems for installing the sheeting. This is because we always recommend shrink wrapping the sides of the scaffolding first and then overlapping the sheeting by 30-40cm on to the top surface of the roof. This means that the side sheet only needs to be cut to go around the handrail stanchions by 30-40cm from the edge of the sheet.

Subsequently, when the roof sheeting is unrolled it in turn is overlapped over the edge of the roof and down the sides of the scaffold sheet by 30cm. This means that the roof sheet only needs to be cut around the stanchions by 30-40cm from the edge of the sheet. The roof sheet and side sheet are then joined by heat welding them together. Finally, patch tape is used to make a seal around the base of each stanchion.

What is the size of your temporary roof?

  1. Small roofs / canopies (up to 5 metres width)

For a small roof (where there is ‘arms reach’ access to the entire underside of the roof) then no additional boards are required to be installed in the roof structure. This also applies to where a canopy is required over the top lift of the scaffolding. As long as the installers can access the underside of the canopy from the top boarded lift then no additional boards are required.

2. Medium sized roofs

Where possible, the temporary roof should be fully boarded out with scaffold boards. This will allow the installer to easily access every part of the shrink wrap roof covering to create welds between sheets and to heat shrink the film ‘drum tight’. Secondly, the boards provide an anchor point for the scaffold shrink wrap film. Once the shrink wrap has been pulled over the temporary roof structure, the installer will batten the shrink wrap to the boards at 1-2 metre intervals. It is therefore important that the boards are properly and securely clipped / fixed to the roof structure as there will be wind loadings applied at these points.

3. Large roofs

Where it is not possible to fully board a temporary roof structure, (perhaps due to weight restrictions) then a run of boards, three boards wide, every 2 metres (2 metre centres) is the minimum requirement with run of boards around the roof edge.

Small temporary roof covering

Fully boarded mid size temporary roof

Partially boarded large temporary roof

What would you like to do next?

Buy Shrink Wrap Materials

If you want to shrink wrap your own scaffolding projects.

Get Installation Services

If you would like us to provide a full supply & fix service.

Learn about Shrink Wrapping

If you want to find out how scaffolding shrink wrapping works.

Have an upcoming project requiring shrink wrapping?