Foundation on Barrier Islands

[jar546]

I just thought I would share something that is a-typical of SFR construction in most parts of the country. In Florida, when you build near the intracoastal or on a beach that has a dune and you build on the dune, this is typical for a foundation slab. Auger cast piles go down anywhere from 40'-80' and are capped with grade beams as shown with the slab being poured over the top, although in many instances, this is a monolithic pour. The slab, however, is always above the FIRM BFE and of course the FBC DFE which is 1' of freeboard since they are almost always certainly in the special flood hazard area, including my town which is 100% either VE or AE zone.
Comments?

 

[TheCommish]

if wave action undermines the slab and grad beams is it still supporting?

 

[jar546]

if wave action undermines the slab and grad beams is it still supporting?

The slab is designed to be self supporting. It is above DFE so it does not have to be frangible.

 

[jar546]

Here is what a SFR looks like pre-mono-pour.

 

[TheCommish]

that is some serious steel

 

[Paul Sweet]

"if wave action undermines the slab and grad beams is it still supporting?"

That's what the piles are for.

 

[ADAguy]

So, why would anyone want to build, or be allowed to build in areas knowing that "eventually" it will be washed away? Can these be insured?

 

[classicT]

So, why would anyone want to build, or be allowed to build in areas knowing that "eventually" it will be washed away? Can these be insured?

The view for one thing....

 

[ADAguy]

Is it worth the potential loss?

 

[classicT]

Is it worth the potential loss?

To you, sounds like a no.

To the thousands of people that live on barrier islands and shore lines, yes.

 

[ADAguy]

Until the tide rises or the winds blow. Same can be said for why do we live in the mountains, view and fresh air. You make your choices and take your chances.