Drone Inspection of an SPF Treated Asbestos Roof
This is a drone inspection of an asbestos roof treated with SPF (Sprayed Polyurethane Foam).
SPF Roof Inspection
The concept of the SPF roof became popular in the late 1980’s but died out with the introduction of cheap steel.
Because of ever-increasing insulation requirements, the SPF roof is now making a comeback, since SPF is a brilliant insulator and is relatively easy to install.
There are some issues that need to be considered though, not least the fact that SPF is not UV stable, so as soon as it is installed, it begins to degrade.
Consequently, it is essential that the SPF roof is coated with a UV stable coating. Asbestoseal 20 is ideal for this purpose, but only in certain circumstances.
In this video, we can clearly see that the SPF roof is in very poor condition and is full of nesting seagulls.
Sprayed polyurethane foam should not be used when seagulls are present because they can (and do) rip it up with ease. They use it for nesting purposes and they eat it.
Most coatings applied to sprayed polyurethane foam will not withstand seagull attack.
The only product that would be suitable in this case would be polyurea, which is hard enough to withstand attack in this way.
However, polyurea is quite expensive and added to the cost of the SPF installation, you could easily be looking at £60 per sq metre, meaning that an over-clad with steel profiled sheets would be more cost effective.
The drone footage shows quite an old SPF roof installation. The coating applied on top is an acrylic paint that has been all but destroyed .
In this case, only an over-clad or complete roof replacement would be recommended.
This particular installation is beyond economical repair.