loose pagesTipping-in is one way to reattach a detached page or plate, errata sheet or replacement page. Tipping-in is not used to put a entire book back together.
If too many pages are loose from the binding, the book should be resewn, or sent to a bindery. “Too many pages” can vary from book to book, but generally more than 3-5 pages is too many.
Tipping-in is generally used on text blocks that are adhesive bound with tightly glued spines. The tight spine keeps the book from opening flat and will help to hold the tipped-in page in place. I have talked about adhesive bound text blocks and how these text blocks are constructed in a previous post.
While the general rule is to use paste when repairing paper, glue is used when tipping in a page. Paste can be a better bond between paper, but it is not as flexible as glue. Since the tipped-in pages need to flex and bend, flexible adhesive is very important.

In the next few posts I will cover the basic instructions for tipping-in loose pages whether they contain text or images.