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Re: [TowerTalk] (Repost) Engineering advice on above ground foundation

Subject: Re: [TowerTalk] (Repost) Engineering advice on above ground foundation
From: Rudy Bakalov <>
Date: Fri, 5 Jun 2009 14:49:34 -0700 (PDT)
List-post: <">>
I really appreciate all the feedback my post has generated.  I think it will be 
helpful to add some further background.

Under normal circumstances I would not trust a builder, but I have known this  
guy for a while and, more importantly, he builds foundations for Rogers 
Wireless in Ontario.  I felt that his experience with what he does for 
commercial installations is somewhat relevant.

His comment was that although we can pour concrete into water, we don't really 
know too much about the soil below as the water is there year around and the 
soil is very sandy. Thus, the decision to have 2 feet of compacted gravel below 
the base.  We also chose gravel because of its heaving resistance.

The original foundation specs call for a base of 9 x 9 x 5. Instead, we built 
the foundation 11 x 11 x 5, which is close to the specs for the 120' tower, and 
using rebar specified for the 120' tower.

Right now there is no tower on the foundation and won't be one until I am 
confident we have addressed major concerns.  Per my original post, we have 
identified the combination of water + freezing as #1 concern, which we 
contemplate addressing through drainage, waterproofing, lots of insulation, and 
the mound 15' around the base.

Looking back, I realize I should have hired an engineer.  But I also believe 
that we can build a solid structure now before the tower goes up.

Again, thank you all for the tough but helpful feedback.

Rudy N2WQ


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