A large number of brick border on one of my porches has erroded away. The factory rep says that this is due to water migrating thru the mortor joint. The damage is concentrated in two specific areas and involves approximately 100 brick. Several brick faces have popped off of vertical walls. Most damage is on border brick well above ground and well drained. Many of the brick are more than half size now. I subcontracted the house construction. Do I have legal recourse? 25 yr. old house.