I have a friend who has a large pile of earth against the wall of his house bridging the dpc. but he doesn't want the earth removed but some sort of sealant put on the wall and the soil replaced. He's heard of a product made by Marley, I guess it's like flashband, but I don't know. Has anyone heard of such a product, or is bridging the dpc a big NO NO. any help appreciated . Thanks.