I don't understand. What do you want to learn from us? If you are doing decking, you need to call specialists so that you do not have any problems later in such a situation. Recently, I also decided to do the decking myself, so almost half the house did not go underground after the rain
Since then, I always advise people to either contact specialists, or find high-quality materials and a person with experience who, if anything, will tell you what to do and how to do it. Most people here don't understand what you're talking about at all, friend
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https://www.walshlandscaping.co.uk/millboarddeckingmaidenhead/ [walshlandscaping.co.uk]