Quote:
Originally Posted by 257wbyhunter
i had to use engineered screw piles for my house it took 20 piles same specs as what you said 12x12 and just for the piles was 7000$ and i had a family friend screw them in with a skid steer so i saved there i find it crazy for what there asking for just a deck around hot tub
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No way to test the torque placed on the screw piles using a skid steer for loading. Bet the Municipality wants a certification on the screw piles for load.
For belled piles, you need to be in an end-bearing soils type for the bell. The load on the pile is on the bottom of the bell not the boreshaft walls like a skin friction pile.
As previously mentioned the norm is - the top 5' of soils in the pile is not used in the calculation for skin friction due to frost action (frost jacking) so therefore you have only 7' of pile in the ground out of the 12'. Depends also that the soils are native/natural and not a uncontrolled fill soils placed during construction. If in uncontrolled fill or poor soils conditions, your piles may need to be deeper.
Pain in the but YES. I sure am glad the house I bought a few years back had concrete piles with pile caps so when I built my new deck, everything was good to go.....mind you my deck floor is about 5' above ground.