The negative side of a building is usually the interior. The positive side is where water can seep though from the outside. The need for negative side waterproofing arises when there is little to no access to the positive side. Be it underground or surrounded by other important utilities. Almost exclusive to basements, negative side waterproofing binds to concrete and seeps into pores effectively stopping leaks from the inside-out! If this situation sounds familiar, give us a call.