A seal should be provided between the non-treated lumber and a concrete or gypsum substrate. If non-treated lumber is to be specified, it must be stored to protect from moisture sources.Lumber treated with any of the wood preservatives such as, Creosote, Pentachlorophenol, Copper Naphthenate, and Copper 8-quinolinolate will adversely affect the membrane when in direct contact and are, therefore, unacceptable. When treated lumber is specified, it is recommended that only lumber that has been pressure treated with salt preservatives be specified.The width of the nailers must exceed the width of the metal flange of edgings, scuppers, etc. At a minimum, wood nailers must be thick enough that the top of the nailer is flush with the top of the membrane underlayment. In addition, it is used to provide solid protection for the edge of the membrane underlayment. A horizontal wood nailer is used to provide an effective substrate for some installation details and for other roof accessories. Wood nailers are often overlooked, but they are a very important component of a successful roof assembly.
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