Hey, thanks to all for the answers!
Some more new short questions:
1.) What attracts Zombies?
(I have almost the whole time screamers near my base. I am at Day 21, running my base with 2 forges, 1 camp fire, 1 workbench, a cement mixer and a lot of candles for the light)
2.) Whats better for defence: Wood spikes or Wood log spikes (upgraded)?
Thanks!
1) Forges, Fires, Cement Mixer all add to the "heat map".
Once that number gets high enough a screamer shows up.
If she sees you she'll call for a small horde to show.
You can open blocks.xml and do a search for heatmap and you'll see everything that generates heat.
[Not fire heat but map heat or noise, as it were.]
2) Don't bother with wood log spikes. Better to collect scrap metal and make metal spikes.
One of the best combinations is to place metal spikes upside down and put wooden spikes [not log spikes, the sticks] on top of that.
If a cop explodes and sends all your wood spikes flying, you still have metal spikes underneath to kill zeds.
Also, having metal spikes upside down will prevent the zombies from doing the roller coaster thing while walking over them.
It's hard to hit them in the head when they keep moving up and down.
Right side up or upside down makes no difference. They do the same damage.
Finally, if you really want a good combination:
Three rows of metal spikes upside down.
Two of them with wooden spikes on top and a third with barbed wire fence.
Very cheap to make and works fantastic!
As the weeks go by and hordes increase just put more rows in.
You don't really need electric fences or turrets.
Spikes really will do the job.