We have a house with two pathways either side. The pathways are 14m x 0.85m. Some of the slabs are uneven and angled towards the house and after heavy rain or excess waterflow from loft tank, the water then sits in a pool by the house brickwork. Then eventually goes down. Can this cause damage to the foundation? Also there are small gravel gutter areas between paving and house, are these pointless and should I replace the mud in there with gravel? If so, what size?