frost depth in crushed stone
frost depth in crushed stone
(OP)
I have a project where a 6 inch dia water line will be buried in # 57 crushed stone. The thickness of stone layer could be as much as 7 feet.
Local codes require the frost depth to be 3' feet.
Question: At locations where the pipe is buried in ASTM # 57 stone, is the frost depth still 3 feet, or should it be deeper
Local codes require the frost depth to be 3' feet.
Question: At locations where the pipe is buried in ASTM # 57 stone, is the frost depth still 3 feet, or should it be deeper





RE: frost depth in crushed stone
RE: frost depth in crushed stone
Check with some of the local utilities or cemetaries in the area, they generally have a pretty good handle on the depth of frost.
RE: frost depth in crushed stone
In this part of Canada codes and common practice usually say 2.4 m with 2.7 under roads. I have seen water and sewer lines as shallow as 1.5 m and they still do not freeze.
One factor is the amount of flow. If this 150 mm waterline will have a considerable flow 24 hours a day, it won’t freeze even if placed on top of the ground.
If codes are 3’ and you are 7’ and the line will have some flow all the time then I don’t think you will have a problem with the fill type.
Still the best advice is to talk to some people who actually excavate the lines to repair or modify in the winter and get an idea of actual frost depths in your area. Its always good to talk to the trades, they know the practical side better that you ever will.
Rick Kitson MBA P.Eng
Construction Project Management
From conception to completion
www.kitsonengineering.com
RE: frost depth in crushed stone
In the Lindsay, Ontario area, frost penetration is 4', and I've seen it go down 7'. In Winnipeg, Manitoba, the frost penetration is typically 6' (I've put in fence posts and found frost a 3' in July) and I've seen it go down 13' in a parking lot near Polo Park...
RE: frost depth in crushed stone
http://www.usace.army.mil/publications/eng-manuals/cecw.htm
This site is a gem!