I
iLikeSushi1 Oct 2015 23:08Hello community!
Our project will be starting in the next few weeks, and we have a question.
The plot has been purchased, and the site development is almost complete.
During the site preparation, the local authority excavated a hole on our property that is about 1 m to 1.5 m (3 to 5 feet) deep and 7 m by 10 m (23 by 33 feet) wide, because old clay bricks and concrete debris from an old barn were found at that spot.
The municipality has proposed the following solution: to fill the “hole” with soil generated during the site development.
The issue is that this area includes our garage and driveway (11 m by 6 m (36 by 20 feet)), while only a smaller part covers the foundation pit for our house (with a basement).
Is it advisable to fill this hole with regular soil (loess loam, alluvial soil) and compact it with a soil compactor?
Our general contractor recommends filling the entire area with crushed stone and discussing the additional costs with the municipality. The normal soil cannot be compacted well enough, and there is a risk of subsidence over time in the driveway area.
What are your experiences with this, and what would you advise as the next steps?
Thank you!
Our project will be starting in the next few weeks, and we have a question.
The plot has been purchased, and the site development is almost complete.
During the site preparation, the local authority excavated a hole on our property that is about 1 m to 1.5 m (3 to 5 feet) deep and 7 m by 10 m (23 by 33 feet) wide, because old clay bricks and concrete debris from an old barn were found at that spot.
The municipality has proposed the following solution: to fill the “hole” with soil generated during the site development.
The issue is that this area includes our garage and driveway (11 m by 6 m (36 by 20 feet)), while only a smaller part covers the foundation pit for our house (with a basement).
Is it advisable to fill this hole with regular soil (loess loam, alluvial soil) and compact it with a soil compactor?
Our general contractor recommends filling the entire area with crushed stone and discussing the additional costs with the municipality. The normal soil cannot be compacted well enough, and there is a risk of subsidence over time in the driveway area.
What are your experiences with this, and what would you advise as the next steps?
Thank you!
H
HilfeHilfe2 Oct 2015 07:28What would the additional costs be? I would take the advice, have it calculated, and discuss it with the local authority (building permit / planning permission office). If my house were to settle, I would xxxxxxxxxxxxxxxxx
I would fill with a mineral aggregate. Clay is difficult to compact properly. Gravel must have a range of particle sizes, including a very fine fraction.
It is important to fill and compact in layers. If you fill the entire 1 - 1.5 m (3.3 - 5 feet) at once, even a heavy roller won’t compact the lower layers, and eventually, the whole structure will settle. The material should not be completely dry and dusty either.
It is important to fill and compact in layers. If you fill the entire 1 - 1.5 m (3.3 - 5 feet) at once, even a heavy roller won’t compact the lower layers, and eventually, the whole structure will settle. The material should not be completely dry and dusty either.
I
iLikeSushi2 Oct 2015 09:01Good morning everyone,
thank you for your replies.
The house itself wouldn’t be affected since we are building with a basement, and the area around the house would need to be excavated even deeper anyway. It only concerns the garage and driveway.
The gravel would consist of different grain sizes (coarse at the bottom, gradually getting finer towards the top) and would, of course, be compacted in layers.
The additional costs were estimated at around €4000 to €5000, and we will receive a detailed quote once the surveyor completes the rough and fine staking, so it can be determined exactly where everything will be located.
I had already assumed that clay is difficult to compact, but I wanted to hear your experiences and opinions.
Best regards,
iLikeSushi
thank you for your replies.
The house itself wouldn’t be affected since we are building with a basement, and the area around the house would need to be excavated even deeper anyway. It only concerns the garage and driveway.
The gravel would consist of different grain sizes (coarse at the bottom, gradually getting finer towards the top) and would, of course, be compacted in layers.
The additional costs were estimated at around €4000 to €5000, and we will receive a detailed quote once the surveyor completes the rough and fine staking, so it can be determined exactly where everything will be located.
I had already assumed that clay is difficult to compact, but I wanted to hear your experiences and opinions.
Best regards,
iLikeSushi
Similar topics