I have a carport, about 20 sqm, which stands on cast piers (see attached image). In the carport there is currently gravel, but I would now like to cast a concrete floor instead.
What I am a bit worried about is what will happen to the cast piers if I start digging out to build a form and lay insulation and reinforcement. Is there a risk that it will settle? What do I need to consider? Do I need to do it in stages?
Are you planning to convert the carport into a garage?
Then you should be able to do all the groundwork except right at the base plate.
Cast the slab (with recess for the base plates).
Start framing the wall or temporary supports (so you can remove the posts and base plates).
Then break up or lift up the base plate and place insulation, and finally pour concrete in the recess.
Can't you take down the carport, cast a slab with mounts for the posts and then put the roof back. That's what I'm considering doing, if the frost heaves the slab the roof will follow.
A 15 cm top and bottom reinforced slab without edge stiffening was cast under what seems to be similar conditions. A Caterpillar 930 wheel loader stood on that slab, and it held up. At least for 12 years. Dowels were drilled into the sides of the pillars, with the other end of the dowels in plastic sleeves within the slab. The slab was then demolished in favor of house construction. (The plot where the garage stood was divided off.)
JOW - The carport currently has a rear wall and a wall on half (inner) of the long sides. I'm thinking of making a full wall, one round of leca, and then framing it up. Then it shouldn't be a problem to remove the posts and do as you suggest.
nino - that sounds like a lot of work for me. The carport is almost 4m up to the roof trusses and has sturdy laminated beams. It would require machines that I don't have and would cost quite a bit to rent or buy.
Yes, it is also possible to make temporary supports outside and inside the future wall.
Like through 2 pillars and 1 beam taking over the post's job. You can then remove the post and the foundation.
Cast an edge beam. Switch over so that the load is taken up by the edge beam.
Then make the slab inside.
I did as JOW suggests when I converted my carport into a garage. It wasn't that advanced. I lifted the roof so I could switch off with the garage jack and a beam.
Robert-san01 - you mean you poured the floor first, then installed a jack to support and cut off the original posts?
The original posts should then be cut so that you can just fit in leca and sill underneath, after removing the old foundation block, insulating and casting?
No, I removed the post in the corner that supported my roof completely so I could make a whole and insulated slab without thermal bridges or risk of shifting.
I took a beam and placed it over the corner up in the roof. Then I used a jack and a beam against the cross beam. When I lifted the roof slightly, I placed beams at the ends of the cross beam, on which I then placed the roof. Then I removed the pillar and the foundation.
I then cast the slab, and when it was finished, I framed the wall and lowered the roof so I could remove the support and cross beam.
Here is the thread about mine and my friend's rebuild.
[link]
It's probably this image that best shows how I think Robert-san01 meant he did it to be able to remove the post in the corner (last image in post #45).
So, the posts standing on the paving stone/concrete slabs support the corner with a beam that lies under the roof truss/hammer beam, it diagonals the corner (I would think, you can't see the roof in the image).
But the post is removed in the image.
And in the image in post #44, you can see diagonal beams acting as a prop, supporting the roof there.
It's probably this picture that best shows how I think Robert-san01 meant he did to be able to remove the post in the corner (last picture in post #45).
That is, the posts that stand on the paving stone/concrete slabs support the corner with a beam that is under the truss/top plate, it diagonals the corner (I would think, you can't see the roof in the picture).
But the post is at least gone in the picture.
And in the picture in post #44, you can see diagonal beams acting as shoring, supporting the roof there.
Robert-san01 can correct me if I have interpreted it wrong..
You interpreted it completely correctly!
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