comumbia_parc4If you want to really know how well a product is engineered or how well it will perform, look at the limitation on the installation instructions. Many products are for covered porches only. Many have a minimum ventilation requirement. Far too many cannot be installed within 30 inches of low-E-glass, (windows and doors with glass). Not one other manufacture will allow their product to be installed in a waterproof or low ventilation application. Add to this, no other manufacture will allow you to cover a cracked concrete slab with their product either. If you want to know which product is the best, look for the one with the least amount of limitation in the use.