Ms Mair?ad Phelan:

There are different building components in construction. For instance, if one is using a concrete block, one needs to check the declaration forms, the essential characteristics and check to see the suitability for the particular wind-driven rain index and weather in the location one is putting it in. It is also dependent on the exterior render that one would put on that as well. There are a couple of things in play here. One will not know anything by looking at a block. One will have to check the declaration of conformity for CE markings and the safety information use.