Why Do Seams On Crown Mouldings Come Apart Or Separated?

There is a common misconception among consumers that wood or MDF mouldings shrink. With our many years of experience, we learned that all MDF mouldings do shrink on a minimal basis. Every 16 feet of moulding shrinks about 1/16", after all it is made from wood which contains moisture. The shrinkage factor is much greater for mouldings that are stored outside in the winter or in humid conditions. If you do buy your mouldings from a lumber yard that stores MDF outside, we recommend that acclimatize your trim inside for at least 24 hours. Other installation procedures that prevent gaps.