Here's the deal:
What you are looking for is referred to as EFIS
(Exterior Insulating & Finishing System) There is more than one EFIS system and they are all proprietary. This is done to protect the dealers and to make you play their game which is only right. You aren't entitled to their products without paying their fees and jumping through their hoops.
That being said you may find a substitute that isn't proprietary if you look around. There are some clues for you in this definition: