Ask the Expert: More Answers to Your Resilient Inquiries

Q: Why is the heat welding of linoleum so different from the welding of sheet vinyl?
A: Where welding of PVC (vinyl) materials are concerned, a thermo-fusion process must occur. This fusion takes place partially in the weld rod and partially in the flooring material itself. In the case of linoleum, the thermo-bond takes place entirely in the rod. For this reason, heat welds are stronger in vinyl products.

Q: What are the causes of underlayment joint show-through in wood underlayment panels?
A: There are several causes of underlayment joint show-through. Perhaps the most common is improper acclimation of the underlayment to the surrounding environment in which it will be installed. There should be no more than a 3% difference between the moisture content of the subfloor and the underlayment. Another common cause is improper fastening of the panel edges. Most underlayment manufacturers require a specific fastener spacing procedure, including a recommended distance from the panel edge and correct length and size of fastener.