How To Install Decking | Homebuilding & Renovating.18 May 2014 . Install-Decking-Step1. Install-Decking-Step2. 1. Work out where you want to build the deck and compress any loose soil with a thumper or a heavy roller. 2. Lay weed-control fabric over the whole site to stop unwanted greenery from poking through and ruining the finished appearance of your decking.