Never used Shrink Wrap find out some of the challenges to prepare for in advance.
This area is a regular questions area and hopefully answers some of the Questions that are obvious to already experienced installers but not so obvious to the inexperienced contractor having to answer to their clients.
1. My installers have called explaining the weather forecast is not looking appropriate for starting the installation.
Installers use a number of weather checking websites these consist of Met office and Wind Guru – Starting an installation can cost them if the weather has forecasted to change – if a sheet is installed but not fully shrunk and welded into place it is especially vulnerable and if the sheet is lost installers find it difficult to recover costs from contracts but also the risk to surrounding areas if it becomes detached.
2. What are the working wind limitations for installation to take place?
The maximum installation wind conditions are normally up to 13mph however the gusting speeds are more important as these are more damaging and unpredictable for installers to work with, gusts can make holding a 7m x 15m sheet almost impossible to weld into place.
3. Can installation take place in the rain?
Installation during rain is not advisable; during the welding of sheets it is imperative to obtain a clean dry weld of 2 sheets to ensure optimum strength from the sheet. If water is trapped between the welds the water expands as it turns to a gas and pushes the weld apart. If an installer refuses to work in the rain it will because they do not want to jeopardize the strength of the welds.
4. What is the maximum working wind speed?
This is down to the installer’s recommendations and installation can change the material integrity including the scaffold.
5. Repairs are required but my installer is refusing to return until weather permits?
This can be frustrating for main contractors but the installer is right to wait, the weather which has caused the damage is also impossible to repair in, as soon as heat is applied to sheet to install patches the wind will blow this out causing a balloon effect, roofs are especially difficult to repair due to the uplift.
6. How do I know what grade material should be used?
An experienced installer will advise correctly, always check an installers portfolio of work, a general rule to work with to help is external works generally has a minimum gauge limit of 280 microns for external scaffolding encapsulation. Marine encapsulation can go to lower grades when used to apply to contain yachts.