M
manello0125 Aug 2020 14:01Hello,
we want to build a patio cover onto our single-family home, which was completed in 2007. We would like to keep the option open to enclose three sides of it at a later date.
Currently, the patio is bordered by a strip footing, on which granite cubes serve as the edge restraint for the 4cm (1.5 inch) concrete slabs.
The problem arises from the fact that about 1.8m (6 feet) of fill was placed under the patio (using the excavated soil from the basement). So far, the ring beam has settled only about 1cm (0.4 inch), but it is difficult to predict whether this will remain stable.
If we now place a conservatory on the ring beam and it settles over the years, this would likely cause problems for the conservatory.
Therefore, we plan to remove the material inside the ring beam and pour a concrete slab.
The procedure would be as follows:
Remove the patio slabs, gravel, and crushed stone.
On the front edge of the patio (parallel to the house wall, bordering the lawn), install three pier foundations about 2m (6.5 feet) deep.
Drill from outside through the wall into the basement ceiling and adhesive-anchor reinforcing steel rods.
Place two layers of reinforcement mesh and tie them with the rods in the house wall and the pier foundations.
Pour the concrete slab.
Now to the questions:
1) What do you think of this approach? What is good, what is bad, what would you do differently, and what would you keep the same?
2) Does bonding the reinforcing rods into the basement ceiling create a thermal bridge? How is this usually handled?
I look forward to your input and a lively discussion.
manello01
we want to build a patio cover onto our single-family home, which was completed in 2007. We would like to keep the option open to enclose three sides of it at a later date.
Currently, the patio is bordered by a strip footing, on which granite cubes serve as the edge restraint for the 4cm (1.5 inch) concrete slabs.
The problem arises from the fact that about 1.8m (6 feet) of fill was placed under the patio (using the excavated soil from the basement). So far, the ring beam has settled only about 1cm (0.4 inch), but it is difficult to predict whether this will remain stable.
If we now place a conservatory on the ring beam and it settles over the years, this would likely cause problems for the conservatory.
Therefore, we plan to remove the material inside the ring beam and pour a concrete slab.
The procedure would be as follows:
Remove the patio slabs, gravel, and crushed stone.
On the front edge of the patio (parallel to the house wall, bordering the lawn), install three pier foundations about 2m (6.5 feet) deep.
Drill from outside through the wall into the basement ceiling and adhesive-anchor reinforcing steel rods.
Place two layers of reinforcement mesh and tie them with the rods in the house wall and the pier foundations.
Pour the concrete slab.
Now to the questions:
1) What do you think of this approach? What is good, what is bad, what would you do differently, and what would you keep the same?
2) Does bonding the reinforcing rods into the basement ceiling create a thermal bridge? How is this usually handled?
I look forward to your input and a lively discussion.
manello01
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pagoni202025 Aug 2020 14:42We had a similar situation in the past. However, during the shell construction phase, we stacked masonry blocks directly against the basement wall and used these as an additional support. Otherwise, we proceeded in the same way.
I am absolutely certain that the ground would settle. After 30 years, we found a hollow space of 30-40 cm (12-16 inches) beneath the concrete slab of the terrace floor, even though the ground had been thoroughly and properly compacted.
For example, at the house entrance, we had a 1 m (3 ft) wide concrete path, which we later covered with paving stones. We extended the paving to 2 m (6.5 ft) wide; after a few years, the edge clearly showed differential settlement—even though the ground there was natural soil.
All neighbors experienced some settlement in their paved areas, so for me, the only reliable solution is a concrete slab or support on such foundations.
I am absolutely certain that the ground would settle. After 30 years, we found a hollow space of 30-40 cm (12-16 inches) beneath the concrete slab of the terrace floor, even though the ground had been thoroughly and properly compacted.
For example, at the house entrance, we had a 1 m (3 ft) wide concrete path, which we later covered with paving stones. We extended the paving to 2 m (6.5 ft) wide; after a few years, the edge clearly showed differential settlement—even though the ground there was natural soil.
All neighbors experienced some settlement in their paved areas, so for me, the only reliable solution is a concrete slab or support on such foundations.
O
Osnabruecker25 Aug 2020 15:38manello01 schrieb:
Pouring the concrete slab.Consider how to get the concrete onto the terrace (behind the house?).
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manello0125 Aug 2020 17:32Osnabruecker schrieb:
Consider how you will get the concrete onto the terrace (at the back of the house??)Thanks for the tip. It will be a lot of work, but it’s manageable.M
manello0125 Aug 2020 17:35@pagoni2020
Thank you for your post. I also believe that a concrete slab foundation is safer.
Thank you for your post. I also believe that a concrete slab foundation is safer.
Hello manello01
The slab is fine, and the foundations should be as well. But why do you want to connect the slab to the house? It only makes things unnecessarily complicated. The slight movement of the house against the slab should be absorbed by the profiles of the patio roof.
Steven
The slab is fine, and the foundations should be as well. But why do you want to connect the slab to the house? It only makes things unnecessarily complicated. The slight movement of the house against the slab should be absorbed by the profiles of the patio roof.
Steven
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