Build the mountain into the garage as a wall

Tossegubbe · 23 Oct 2009 at 1:11 AM

Get a blasting license and suitable equipment and you can do it for under 100k guaranteed, granite is easy to blast too (relatively)
But diamond wire sawn is cooler anyway, imagine those walls! That's where the neighbors can go jump with their biltemaklinker

cheetah1 · 23 Oct 2009 at 1:14 AM

If you build it, promise that we can come and visit?

pbengtsson · 23 Oct 2009 at 7:12 AM

Tossegubbe said:
Get a blasting license and appropriate equipment and you can do it for under 100k guaranteed, granite is relatively easy to blast.
But diamond wire sawing is cooler, think of the walls! The neighbors can forget about their Biltema tiles

I did blasting in the military, but then the idea wasn't to use the stuff afterward.
How "fine" can you blast? Is it feasible in a smaller shaft without it looking like a minor accident?

pbengtsson · 23 Oct 2009 at 7:17 AM

cheetah1 said:
If you build it, promise we can come and visit?

Sure, as long as you dress up as Batman.

raveper · 23 Oct 2009 at 7:36 AM

It probably won't be a pleasant work environment with a damp rock in the garage. It's not like you would lie down on the floor in a root cellar directly.

pbengtsson · 23 Oct 2009 at 6:35 PM

Searched around a bit on the internet and apparently there is a technique where you drill holes around, a bit out from the shaft. In these holes, you inject fine cement which then seals gaps. Then it seems you don't need to treat the visible part of the rock.

pbengtsson · 23 Oct 2009 at 10:19 PM

If I go back to the original question, how do you seal the roof against the mountain?
That is, using the rock face as the gable.
Do you mill a groove into the rock and insert a metal sheet with sealant?

raveper · 23 Oct 2009 at 10:26 PM

It might be possible to weld thicker roofing felt directly onto the rock.

pbengtsson · 23 Oct 2009 at 10:35 PM

raveper said:
Might be possible to weld thicker roofing felt directly onto the rock.

For my flat roofs, I used a reinforced EPDM rubber mat that was heat-welded (hot air gun). Maybe you can use the same technique for sealing against the rock. The rubber mat was incredible, unfortunately, it was 3mm thick (soft) otherwise, I would probably have used it for bathroom sealing. It withstands gravel instead of decking if desired.

v-g · 23 Oct 2009 at 10:41 PM

Probably should have put sheet metal against the mountain, regular roofing sheet type, then some insulation and a ceiling.

Don't forget the turntable for the Batmobile, a hidden wall is probably already planned

Tossegubbe · 23 Oct 2009 at 10:48 PM

pbengtsson said:
I did blasting in the military, but at that time it wasn't intended that you wouldn't use the stuff afterward. How "carefully" can you blast? Is it feasible in a smaller shaft without it looking like a minor accident?

Mja, you can probably blast quite precisely with the right knowledge and equipment, but of course, it depends on the conditions as well. I saw them make a "doorway" in 40cm of reinforced concrete with an RSV charge, but it's different with a massive rock.

16mm holes very tightly spaced and small-hole dynamite would be what I might try instead, but the question is whether saying might be cheaper anyway? and definitely neater!

pbengtsson · 23 Oct 2009 at 10:50 PM

Sheet metal sounds more sensible.
A hidden wall is planned in case I cut through the mountain (I will find out if it's feasible). Otherwise, the Batmobile will have to be a Zündapp and the villains will ride Puch Dakota.

Mäster · 23 Oct 2009 at 10:51 PM

Is there any point in pouring a little on the wall, so then you get a straight smooth surface to connect the ceiling and walls against?
Similar to how it usually is in tunnel openings/portals to mountain rooms.

pbengtsson · 23 Oct 2009 at 10:55 PM

Mäster said:
Is there any point in casting a little on the wall, so then you get a straight smooth surface to join the roof and walls against? Similar to what is usually done in tunnel openings / entrances to mountain rooms.

Very good idea, you create a cast "gutter" on the back of the roof that diverts the water from above.

pbengtsson · 23 Oct 2009 at 11:01 PM

Tossegubbe said:
Mja, one can probably blast quite accurately with the right knowledge and equipment but of course, it depends on the conditions.
I saw them cut out a "doorway" in 40cm reinforced concrete with an RSV charge, but it's different with a solid rock.

I would probably have tested 16mm holes very close together and light hole dynamite, but the question is whether sawing becomes cheaper anyway? and definitely neater!

What I'm wondering about with sawing is if the setup cost is the major expense and the sawing is the variable cost.