To ensure that your deck has a long, trouble free life, it's important to use the right fixings used to fix the planks to the bearers. This choice can be influenced not only by the prevailing climatic conditions, the proximity to marine environments, but also the actual wood used. As your deck will around for a long time, it's best not to compromise too much on the fixings as the higher cost of better quality products will be repaid many times over with a longer service life and better looking deck.
Normally, standard iron nails should not be used on external decking as they can rapidly corrode in certain climatic conditions or close to marine environments and not only leave black stains around the nail holes, but can eventually corrode so extensively that they will simply snap. Remember that all wood will twist and warp to some extent so its important that wood planks are firmly fixed to the bearers at regular spaced intervals to keep the timber from moving. If you wish to use nails, then you should use a good quality galvanized nail, recommended for exterior decking. Note that some species of lumber - in particular, Western Red Cedar, Merbau and Redwood - contain tannins that can cause corrosion to occur more rapidly than with other species of lumber.
If using screws to fasten the decking planks to the bearers, then again you shouldn't use standard steel screws, but either stainless steel or good quality plated screws. But there are many different methods of plating screws and some of the cheaper products may look great in the packet when they're purchased but not so pretty after a few years of use. Plating may be only superficial at best and in the process of fixing screws into the plank, the plating can be damaged which allows corrosion to start from day 1. So it's important that you use a good quality plated screw and is specifically recommended for use on exposed decking.
There are many types of materials for making stainless steel screws, and they can be divided into several categories according to the structure at room temperature: austenitic type: such as 304, 321, 316, 310, etc.; martensite or ferrite type: such as 430, 420, 410 Wait; Austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. Due to component segregation or improper heat treatment during smelting, a small amount of martensite or ferrite in austenitic 304 stainless steel will result. In this way, 304 stainless steel will have weak magnetic properties. After 304 stainless steel is cold worked, the structure will also be transformed into martensite. The greater the degree of cold working deformation, the more martensite transformation and the greater the magnetic properties of the steel. Like a batch of steel belts, Φ76 tubes are produced without obvious magnetic induction, and Φ9.5 tubes are produced. Because the bending deformation...
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