I'm working on a house with a steel stud embedded in EPS foundation wall. The wall is 8' high. I was told that I need to have washrock to within 12" of the final grade. So it comes out to about 6ft of washrock. Does this makes sense?? I thought washrock was only needed for about 12" above the weeping tile.
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House Foundation Backill
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I suggest you search out threads under Soil/ground water under French Drains.
You will find many discussions about drains. You may find that I preach not using gravel, but ASTM C-33 concrete fine aggregate (concrete sand) because the gravel is not a filter.
As to why full height, well some think that if a little is good, more is better, or similar ideas, without merit.
However, if backfill is likely to be saturated, some form of drainage-way down to the drain is good, but not all the backfill.
You will find many discussions about drains. You may find that I preach not using gravel, but ASTM C-33 concrete fine aggregate (concrete sand) because the gravel is not a filter.
As to why full height, well some think that if a little is good, more is better, or similar ideas, without merit.
However, if backfill is likely to be saturated, some form of drainage-way down to the drain is good, but not all the backfill.
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