The chemicals used to treat the wood enhance fast metal corrosion. If youre not touching the wood or exposed to its sawdust theres basically no risk.
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CCA-treated wood had been used successfully since the early 1930s and became accepted as a reliable performer when used as blocking and nailers in roof assemblies.
Pressure treated wood for roofing. Regardless of whether you need pressure treated or untreated lumber for your project we have both types in stock in every size and shape here at Lyons Lumber Co. The answer depends mostly on how far apart the rafters are and the roof loads which vary based on the pitch of your roof. I have a low sloped roof to replace where the 12 OSB has rotted out at the edges and water has been penetrating behind the gutter and I am afraid will soon be into the interior walls possibly even rotting the ends of the trusses sitting on the top plate.
Galvanic corrosion occurs when electrons move away from an anode toward a cathode. In this case plywood should be a minimum of 38 inch thick. But it turns out that manufacturers do offer shingles that have been pressure-treated with a compound called chromated copper arsenate or CCA for short to extend the life of this already hardy species.
CCA is no longer used for most residential products. To start pressure-treated wood is softwood lumber typically southern yellow pine thats been chemically treated to resist rot decay and termites. CCA Chromated Copper Arsenate pressuretreated lumber that was predominantly used before 2004 but not with the older Penta treated lumber or the new ACQ Alkaline Copper Quartenary CA Copper When a metal roofing sheet must be installed on a curved roof screws.
Ive just put a plain galvanized shiny no paint or - treated wood and galvanized roof 7222011 within the Installation discussion of the residential metal roofing forum. CCA pressure treated Shake and Shingles are designed for extremely wet shaded or tropical climates where building materials require an increased resistance to fungal decay and also in many southern geographic locations where termites are present. AWPA U1 provides specifications for non-copper-based waterborne preservative systems that have been found to not corrode metal.
Pressure-treated wood in particular is no good for GALVALUME roof materials. Treated wood commonly is used in the US. When treated lumber is specified it is recommended that only lumber that has been pressure treated with salt preservatives be specified.
The Pressure Treated material hereafter PT feels really heavy and you can almost squeeze water out of it. The heartwood of cedar is highly resistant to decay all by itself. The point being that when you get it to the job site it will continue to dry and it can warp a remarkably great deal.
The most common scenario is a home that has rafters set approximately 16 inches apart. Then occasionally youll find a piece which isnt quite as heavy. Pressure-treated lumber is often treated with one of two chemicals.
Pressure treated wood doesnt release any gases or particulates that could harm you and your family. These corrosive chemicals leach out of the wood and accelerate the corrosion process. Watkins preservative treated wood offers easy handling and modification long life and low cost.
Most pressure-treated wood is treated with chromated copper arsenate. 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. Currently the only treatment included within the standardspublished by AWPA for use in wood roofing is a pressuretreatment using CCA.
This can be extremely helpful in areas with high humidity to provide longevity to cedar roofing utility highway marine agricultural and heavy construction. Can pressure treated plywood be used as roof decking without being destroyed by the dry heat a roof is exposed to. Only wood shakes that are manufac-tured from Southern Pine are referenced in this standardThe retention of CCA that is specified by AWPA forSouthern Pine shakes and shingles is 04 pounds per cubicfoot 4 lbft3 64 kgm.
Construction industry as a component in roof assemblies. Copper azole CA-C or alkaline copper quaternary ACQ both of which contain copper a harder metal. If the treated wood is situated next to flashing or fasteners made out of a metal softer than copperlike aluminumthe copper in the treated wood will attack the softer metal.
I would be concerned that galvanic corrosion could degrade the metal roofing or fasteners. CCA-treated lumber for commercial use is available from treated wood manufacturers. The metal present in the treatment chemical copper is dissimilar to the metal roofing steel.
Lumber designated for Ground Contact can be placed directly on or in the ground. In The NRCA Roofing and Waterproofing Manual Fifth Edition the National Roofing Contractors Association NRCA specifically recommends the use of decay-resistant treated wood for blocking and nailers at roof perimeters and penetrations for fastening membrane and sheet metal flashings. Invented in the early 1930s CCA treatments protect wood against insect attack and fungal decay and is expected to give life to the wood in excess of forty years.
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