Bunker

[Norlund]

I was thinking of building an underground bunker. Entrance from our basement. It will be protected from fire and have a vault-like door and is intended for storing digital materials (hard drives, memories, etc.) as well as important papers, old photos, and other things that you particularly care about.

Now to the technical part, how do I protect the bunker roof from water, since it will be a few meters underground? It obviously must be well-drained, but some form of waterproofing must still be used on top of the concrete, right? What material is used for that?

 

[Roary]

I would dig a pit and cast a small house therein with a sloping roof and then clad the "house's" walls and roof with isodrän, lay drainage pipes and fill up with gravel around it, that is also on top. Then I would lay landscape fabric on the gravel and top with soil.

 

[mycke_nu]

A bunker sounds a bit over the top! We acquired a former bank location a few years ago and the archive looked like this. Cast floor and ceiling and brick walls.

Maybe it would be easier to build something in your basement if you have space?

 

[Norlund]

Unfortunately, I don't have room for it in the basement, and the idea of a "secret" underground room with a hidden entrance is a bit intriguing

It might work well to cast a box with a sloped roof, a waterproof layer (tar?) isodrän board, and gravel, thanks for the suggestion Roary.

 

[chrille112]

How exciting, you must post pictures when it's time to start building!

 

[mycke_nu]

If you didn't like my bank vault, I can offer a picture from inside our bunker. Complete with a machine gun mount . One meter thick reinforced concrete, but not underground of course..

 

[Fotografen]

No matter how well you drain, you are likely to need a dehumidifier, possibly heating or possibly cooling if you are going to have a lot of electronics down there...

 

[Norlund]

That bunker could become a nice SPA, I suppose you can see the sea?

We live on a hill consisting of sandy moraine, which drains itself very well, but additional drainage and some form of ventilation are probably needed. The boiler room is nearby so I could take warm air from there and pump it into the bunker.

 

[mycke_nu]

That bunker could become a nice SPA, I assume you can see the sea?

We live on a hill made of sandy moraine, which drains itself very well, but additional drainage and some form of ventilation are probably needed. The boiler room is close by so I could take warm air from there and pump it into the bunker.

Yes, there are some sauna plans.

 

[vedeldaren]

Thinking of building an underground bunker. Entrance from our basement. It should be protected from fire and have a vault-like door and is intended for storage of digital material (hard drives, memories, etc.) as well as important papers, old photos, and other things you are particularly concerned about.

Now to the technical part, how do I protect the bunker roof from water, as it will be a few meters underground. It must, of course, be well-drained, but some form of waterproofing must be on top of the concrete, right? What materials are used for that?

If you cast more than 30 cm, the concrete becomes waterproof without a waterproofing layer.

The greater risk is that you get small cracks that let in water, but these can be injected if necessary.

 

[Norlund]

So 30 cm of concrete does not let water through, that's good, I was considering about 40 cm in walls and ceiling.

 

[T&H]

Unfortunately, I don't have room for it in the basement, and it's a bit exciting with a "secret" underground room with a hidden entrance

It might work well to cast a box with a shed roof, a waterproof layer (tar?) isodrän board and gravel, thanks for the suggestion Roary.

I can only agree, really exciting. In times of catastrophe or when Hurricane Gudrun's sister comes to visit, you can go down and sit and cozy up while the world ends above.

 

[abbe_]

Have you checked:
http://www.byggahus.se/forum/grund-markarbeten/13193-betonggarage-under-mark.html

or:
http://www.byggahus.se/forum/tak-vind/88582-alternativ-till-traetrall-pa-takterass.html

Protan (http://www.protanlindstromtak.se/produkter-2.htm) seems to have waterproofing for covering.

/Abbe

 

[fubar]

How has it gone with the bunker?

Now that Ebola is raging, IS is attacking from one direction and the Russian from another and the general morale in society is declining, so...