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Part of being a professional is knowing when to seek help or advice. Ever since I began writing this column, there have been certain questions from my readers that have come up again and again. Consider this my Top 10 list of frequently asked questions when installing wood underlayments.
Q: When installing wood underlayment is it necessary to allow for an expansion zone (similar to installing hardwood flooring)?
A: Yes, all wood underlayment installations should leave about a 1/4" expansion zone at the walls or fixtures. The reason for this is all wood moves with humidity, and if a wall or fixture is too tight the underlayment panel will tend to buckle or the joints will peak.
Q: Which type of underlayment fastener has the best holding power?
A: A ring or screw shank nail has almost double the holding power of a staple. (This is providing you use a ring or screw shank nail.) If I am using a stapler, I would use more fasteners than if I were using a nail. A smooth shank nail used for underlayment has a diminished holding power.
Q: Is there a moisture limit for subfloors when installing an underlayment over it?
A: Like any hardwood floor, there is a maximum moisture content of 13% for wood underlayments. Unfortunately, not many installers check the moisture content prior to underlayment installation. This needs to be completed as part of new construction and remodel installations.
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