It is essential that your fixings are stainless steel grade A2 or A4. Fixings made from other materials such as nickel-plated brass or zinc are strongly not advised.
In most cases, stainless steel self-drilling screws are able to be used to fix AliDeck products to steel framework. However, we strongly recommend that you understand precisely the specification and construction of the steel you are looking to fix AliDeck products to and choose the appropriate fixing to suit your specific situation.
When you are sure that stainless steel self-drilling screws are suitable for your application, we recommend the following;
- For steelwork less than 3mm thick, coarse-thread self-drilling screws should be used
- For steelwork greater in thickness than 3mm, fine-thread self-drilling screws should be used
Self-drilling screws are available to purchase from ToolStation, but alternative vendors will also stock suitable screws.
It is essential that self-drilling screws with thermal washers are used. The rubber washer provides a thermal break between the screw and the decking board and reduces the risk of cross-contamination between steel and aluminium. Self-drilling screws with washers of the correct size to comfortably fit within the central fixing area of our decking boards are readily available.
When applying these fixings, care must be taken to not over-drive the screws. We strongly recommend that impact drivers are not used as the increased torque can easily crack or even completely break the head of the screw. When the head of the screw is cracked, the natural flexing of the decking boards under use may eventually cause the weakened screw to break away completely.
It is important to pre-drill a clearance hole in the decking board before you use the self-drilling screws. This will help to ensure that the fixing will have minimal interaction with the aluminium and minimise the risk of galvanic corrosion.