Metal Roof On Treated Lumber

The asphalt in the felt paper is waterproof and does a great job of protecting the.

Metal roof on treated lumber.

Metal roofing panels rated for architectural use attached to purlins horizontal pieces of wood or metal fastened to roofing trusses are structurally sound when installed according to your roofing manufacturer s instructions and local building codes. Most pressure treated wood is treated with chromated copper arsenate. Step 1 determine the points of contact between the treated wood and the aluminum. Use a tool belt that has a hammer loop to hold nails a measuring tape chalk line and a hammer when installing the wood.

For the roofing industry the potential for there to be corrosion related problems with the use of the current new generation of treated wood is a particular concern. At max kendall lumber and tin we are the metal roofing manufacturer of master rib pbr and standing seam. The metal present in the treatment chemical copper is dissimilar to the metal roofing steel. Most metal roof companies recommend installing felt paper on roof sheathing before you install the metal roofing.

The pressure treated wood contains copper along with other metals that interacts with aluminum and causes the corrosion. In roof assemblies treated wood is oftentimes used in as a component that interfaces with or is in direct contact with metal metal fasteners metal flashings and other metal accessories or metal roof decks. For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. To combat the corrosion caused by high copper content in the wood preservatives new galvanizing standards were established for the hardware manufacturers.

By following a few simple steps the dissimilar materials can be separated and the corrosion process stopped. From rough dressed lumber to fence posts we guarantee to have the best quality and prices in the area. I would be concerned that galvanic corrosion could degrade the metal roofing or fasteners. Galvanic corrosion occurs when electrons move away from an anode toward a cathode.

Experienced do it yourselfers can use a nail gun with 8d nail clips instead of a hammer and nails. Until the copper content was raised in 2003 hardware with a g90 coating was acceptable for use with pt lumber.