When treated lumber will be in direct contact with metal panels or flash ings please note the following.
Metal roof on treated lumber.
Galvanized steel is compatible with the cca chromated copper arsenate pressure treated lumber that was predominantly used before 2004 but not with the older penta treated lumber or the new acq alkaline copper quartenary ca copper.
Most pressure treated wood is treated with chromated copper arsenate.
Water is an electrolyte.
A metal can corrode when minuscule amounts of electricity travel through an electrolyte connecting dissimilar metals.
For many applications a layer of plywood underneath your metal roofing is an unnecessary expense.
Additionally per metal roofing manufacturer instructions battens should never be treated lumber as salts and chemicals in the treated lumber can cause corrosion of the metal roofing panels.
The roofing is manufactured in panels that.
From rough dressed lumber to fence posts we guarantee to have the best quality and prices in the area.
Get free shipping on qualified metal roofing or buy online pick up in store today in the building materials department.
Tin roofing also known as metal roofing is considered more durable than composition or wood shingles.
Purlins are non pressure treated 1 x 4 x 12 lumber that is installed on to the roof in a specific layout pattern and screw pattern.
Installing wood stripping under a tin roof.
The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to.
The pressure treated wood contains copper along with other metals that interacts with aluminum and causes the corrosion.
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.
Since condensation is very likely to collect on the underside of metal roofing you have an electrical conduit waiting to be plugged in.
By following a few simple steps the dissimilar materials can be separated and the corrosion process stopped.