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Author Topic: Frost heaving  (Read 404 times)
KC0LTV
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Posts: 26




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« on: July 21, 2006, 01:22:27 PM »

I am in Northern Minnesota, where the city requires home foundations to be 60" under ground to prevent frost heaving.

I am hoping to erect a small 34', 300-lb crankup tower.  The base is about 4.5' x 4.5' in area, with the depth partially dug.  Is it necessary for me to bring it down that far?
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N3OX
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« Reply #1 on: July 21, 2006, 02:39:17 PM »

Yeah!

A small amount of motion of the base is all it takes to get the thing significantly out of plumb, and then you've got, at best, a leaning tower,at worst a big tower hole in your house.

Keeping tower foundations below the frost line is good practice, even if it's not required by local code.

73
Dan
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73,
Dan
http://www.n3ox.net

Monkey/silicon cyborg, beeping at rocks since 1995.
N3OX
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« Reply #2 on: July 21, 2006, 02:41:21 PM »

Incidentally, why's the base 4.5 feet x 4.5 feet if you're worried about not going down 5 feet?  What does the manufacturer recommend?  

I think it's weird to have a base that's much wider than it is tall, but I've not installed many towers.

Dan
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73,
Dan
http://www.n3ox.net

Monkey/silicon cyborg, beeping at rocks since 1995.
KE4DRN
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« Reply #3 on: July 21, 2006, 03:49:41 PM »

hi,

are your required to file for a permit and or inspections ?

Taking extra steps now will help prevent problems
when you want to sell the house.

73 james
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KB9CRY
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« Reply #4 on: July 24, 2006, 10:18:24 AM »

 where the city requires ......to be 60" under ground to prevent frost heaving.

Is it necessary for me to bring it down that far?


Question asked and answered.

Yes, you need it that far down.  Phil  KB9CRY
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