We have seen the real demand for insulated doors, shutters and entrance doors rise dramatically in the last 2-3 years and as we remind people constantly, an insulated door product usually offers far greater security as well as insulation due to the basic construction techniques. An insulated garage or roller type door will usually be a minimum of 9mm thick and can be as much as 45mm thick and is double skinned in steel or aluminium. When you look at some of the latest entrance doors these can be as much as 100mm thick so the panel strength is great and also enables the use of some hefty locking mechansims too.