Good question for I guess it is difficult to find the info on this vast survivalistboards.
I also would like to know If any girls have built a bunker. I think I heard of one once upon a time.
But here is a long thread with Many pics that tells about everything one would want to know about bunkers, underground shelters, root cellars etc. I show pics exactly how I did this and I might even show and tell much more so people won't have to keep messaging me for info. >>
http://www.survivalistboards.com/showthread.php?t=107463
Although I go back up to my mtn paradise and work on the bunker as well as a hundred other things by mid June until Nov or later.
And since possibly many will not look at my pic thread above or even the 4 other pic threads here are the details just about the roof >
These plans below are one of the "secrets" for they have been nuke tested and survived at 53 pounds per sq. inch of blast overpressure, only one pole got cracked. And the nuke blast would flatten above ground structures.
I also used 3 layers of logs for my roof which I believe even a tank could drive over it and the roof would easily survive. The roof to my bunker has survived 12 winters with up to 12 feet of snow pack.
I also used 5 sheets of plywood on the roof as well as chicken wire and rebar in the concrete.
I used the small pole shelter plans from this book:
http://www.oism.org/nwss/s73p933.htm
Roof of the bunker showing layers. This roof is made of 3 layers of logs, cardboard on top, layer of sawdust, sheets of plastic, layer of newspapers to protect the plastic then layer of dirt, then heavy tarp, more newspapers, much more dirt and rocks, soil on top and I have 4 kinds of grasses, raspberry bushes etc. growing on top >
Showing finished roof with grass on top with a dead tree also for more camo, stovepipe, plywood covered window etc. >
Close-up of concrete roof and stovepipe >
Back trap door showing 3 foot thick rock and concrete roof. Took 250 eighty pound bags of concrete mix to make the concrete roof. >
Showing the 3 layer log roof >
The ceiling of the main room of the bunker with ladder and bunk bed on the right >
IF anyone ever builds something similar to what I have built please message or even email me, for I would like to hear about it. Even just doing a roof such as I have for I believe it is the strongest roof for the least amount of money that can Ever be built!