Expansion Joints May 16, 2017May 18, 2017 by John @ Exact Cut John @ Exact Cut No comments yet Cut On: Water Jet Material: Gray Sponge Did you know we can cut sponge? These long strips of gray sponge are expansion joints. You won’t see them, but they are important materials to use in a construction job. Post navigation Ready, Set, Go!Steel Legs Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.