Also if the treatment chemical is not shown in the Corrosion Classification Table, then Simpson Strong‑Tie has not evaluated it and cannot make any recommendations other than the use of coatings and materials in the Severe category. If the treatment chemical information is incomplete, Simpson Strong‑Tie recommends the use of a 300 series stainless steel product. Use the Simpson Strong‑Tie ® Corrosion Classification Table See related chemical product literature for corrosion effects of treatment chemicals and fastener corrosion resistance recommendations. The information should include timber treatment chemical and chemical retention. The preservative-treated timber supplier should provide all of the pertinent information about the treated timber being used. See AS 1604 and Timber Preservers Association of Australia and other related organisations for treatment practices and chemicals. Unknown exposure, materials, treatment chemicals, or corrosion effects of timber. Marine environments that include direct exposure and exterior sheltered exposure to ocean salinity, salt water splash, and elevated moisture due to air or ground moisture. Includes air pollutants, fertilisers, soil, some preservative treated timber, industrial fumes, acid rain, and other corrosive elements in dry and wet service environments. These include applications that are external sheltered and exposed and general-use ground contact. Generally EXTERNAL construction in conditions other than elevated service. Generally INTERNAL applications include roof and wall cavities, raised floor applications in enclosed buildings that have been designed to prevent condensation and exposure to sources of moisture. Wood type, environment and size determine which option is best. For an approved assembly, always follow the wood suppliers' instructions for the distance between the boards.Guidelines for Selecting Corrosion-Resistant FastenersĬonsider the importance of the connection.Ĭonsider these moisture and treatment integrated environments. Wooden decks made of woods such as Teak, Cumaru, OrganoWood and Siberian larch, as these woods flex more.Below ground level because the risk of corrosion is much greater.High above the ground because the structure moves more than it would near the ground.Rails and stairs because the structure moves when used.Large wooden decks, since the movements within the structure exert a significant force.Wooden decks that will be washed, since cleaning agents accelerate the degradation process of the screw’s surface treatment.Decks close to entrances where road salt (de-icing salt) is used because the corrosive substances in the salt can penetrate the wooden construction.Pool decks because pool water is more aggressive than normal water and the environment is usually moister.Wooden decking in these environments is subjected to high levels of salt and moisture, which contribute to large movements in the structure. Coastal or near coastal locations, marine environments and docks.Enivirments where stainless steel is recommended It is therefore important to choose the screw according to where, how and with what you will build your wooden deck. Non-stainless-steel screws or screws that lack the correct surface treatment risk corrosion (rust), which in turn can lead to fractures in the steel. The type of construction and choice of materials can also be crucial if the assembly requires stainless steel to extend its lifespan. In order to avoid rust in environments classified as aggressive, stainless steel deck screws are a must. Avoid rust: Selecting the correct screw characteristics
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