Firestop has enough things to get technical about from annual space, various types of penetrations, solutions and what not. You may know about the 4 ratings firestop can have- F, T, W and L. This blog post will be focusing on the L ratings. have a read and let me know what you think. If you have questions don’t hesitate to reach out to me, or your favorite firestop company for answers. Check out this blog post here.