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Widening existing garage by 1.2m without foundation

Killerpirate

New member
Joined
Apr 3, 2024
Messages
3
Hello, im new here!

We are increasing the size of our garage, let me tell you a couple of things

SEE ATTACHMENT

OLD/current GARAGE
Current dimensions: 6 x 3 (meters)
Roof: Flat roof
Floor: Concrete floor. MAYBE with piles underneath (i dont know for sure yet)
Walls: Bricks

NEW GARAGE
Dimensions: 6 x 4 (meters)
Roof: Gable Roof
Floor: Concrete floor with piles underneath
Walls: Wood

I have a couple of questions, since i am a newbie. I intend to do the construction myself because its a fun project. Only issue at this point is that i do not know much about foundations.

We want to keep the current concrete slab thats underneath the garage (6x3 meters)
We want to extend the concrete slab by 1 meter. But we dont want to spend too much money on the complete project, so to save time and money we want to avoid 2 extra piles underneath the extended part of the slab. But obviously we do not want the new garage to sink down on 1 side over the years

To avoid this, i plan it to do like this:
Tear the place down, except the long wall and one short wall (see attached drawing)
2 mounts on the corners of the old concrete slab with 2 wooden posts
Steel H-beam across the length (span is 6 meters)
Perpendicular 5 wooden beam of 4.2 meters with 1.2 meters cantilever
At the end of the cantilever, 5 wooden posts, resting on (adjustable) concrete foots. embedded in the ground.
1174525-8c00df7ca8b4f65812baf35074daabbc.png
Underneath each post i will add a wooden post of 3m long as a pile


The idea behind this is the entire structure rests on the existing floor, and a little bit on the 5 concrete foots.
I am pretty newbie when i comes to construction, but does this seem possible? Any things i am missing?
 

Attachments

  • Garage 3.pdf
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Killerpirate

New member
Joined
Apr 3, 2024
Messages
3
What do you mean with 'require'? We can build without permit up to 5meters high, with the walls at a max. of 3m.
The rest is up to you :)
 

Stuart in MN

Well-known member
Joined
Sep 8, 2005
Messages
23,539
Location
Minneapolis
OLD/current GARAGE
Current dimensions: 6 x 3 (meters)
Roof: Flat roof
Floor: Concrete floor. MAYBE with piles underneath (i dont know for sure yet)
Walls: Bricks
In the US, garages built on floating slabs without foundations or piles underneath are fairly common. I assume you live elsewhere, so building practices may be different, plus it will also depend on the quality of your soil. Some careful hand digging next to the existing slab to see what's underneath may be a good idea.
 
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racecougar

Well-known member
Joined
Jan 26, 2021
Messages
5,605
Location
Missouri
Is this in a location that has any sort of frost depth? Mixing two different foundation techniques is asking for heave, if so.
 
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Killerpirate

New member
Joined
Apr 3, 2024
Messages
3
ah, sorry, totally forget to mention where i live.
I am in the netherlands. 60 years ago there was meadow at the location of my house. After that the land was reclaimed and a layer of sand was added on top of it, on which they build or town.

My Neighbors told me the tiles in the garden are not sinking.
 
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