NBC filter-ventilation: how a shelter breathes
A breakdown of the shelter’s key system: where the air comes from, what overpressure is, and why filters come in three classes.
BLOG
Engineering journal
We write about what we know hands-on: geology, monolithic concrete, filter-ventilation, autonomous systems and building codes. No panic, no marketing fairy tales.
Choosing a plot for a shelter: geology without myths
Groundwater, soil type, neighbouring foundations — what really drives the cost and whether you can build near a river.
Waterproofing the monolith: three protection loops
Bentonite mats, membranes and injection systems: how we guarantee dry walls six metres down.
Autonomous power: generator, batteries and the sun
How many kilowatts a shelter really needs, how quietly a generator runs underground, and why a bunker needs solar panels.
DBN V.2.2.5: what the code requires of private shelters
Protection class, area per person, two exits: the key requirements of the state building codes in brief.
Water underground: well, reserve, treatment
Three water sources for an autonomous shelter, and why the reservoir is more than a tank in the utility room corner.
Questions about your plot?
An engineer will answer to the point: geology, budget, timeline.