Same hereI know I have said this before but here it is again, my knees are shot ,should have always worn kneepads not just now its too late.
Now use pads but as the old saying goes "not a lot of good shutting the gate after the horse has bolted"
As for boots I use Dickies..only problem they go through laces like theres no tomorrow due to the metal loops.
http://mammothworkwear.com/safety-footwear/waterproof-boots/dickies-thames-waterproof-steel-toe-boots--free-socks-p450.htm