$4\mathrm{.}58$ Insulated concrete forms $($ICFs$)$ are becoming more

common for a variety of reasons including the desire to build

more energy$-$efficient "green" structures. Instead of using

temporary forms like lumber to hold poured concrete in place

until it has cured, an ICF is essentially a rigid lightweight foam

container for a poured wall that is left in place permanently,

providing an added layer of insulation. See the basic layout of

the system in Fig. P$4\mathrm{.}58.$ The form, of course, needs to provide

adequate strength to contain the wet concrete $(SG=2\mathrm{.}4)$ until it

cures. A leak or blowout at the bottom of the form would have

a catastrophic effect on construction. What is the maximum

pressure that the form needs to withstand if the wall is to be

$4\mathrm{.}5$ in thick, $35$ ft wide, and $14$ ft tall?

#$17$