Browse Forums Building A New House Building Standards; Getting It Right! 1. optional, you can but normally just use the earth from the main switch board 2. should be enough but the distance determines voltage drop - sparky should work it… 1 28762 Engineering timber is certainly a less fuss option, times cheaper to supply and install and better withstands humidity. 1 15884 The concreter will take and reuse. In my case I bought structural LVLs and scraped them back and used them as joists. 1 5149 |