$12\mathrm{.}8$ Your intern has specified the following grades for various sizes of lumber for a project. Determine if you would be abla to obtain the lumber as specifled.

$\backslash$table$[[,,],[$Lumber$,$Grade,Yes$/$Ne$],[28,$Construction,$],[210,$Standard,$],[24,$No$.,],[26,$Stuld,$],[212,$Utillty,$],[28,$No$.,],[24,$No$.,]]$

$12\mathrm{.}9$ Give your recommendations for the exposure rating of the following engineered wood products in a typical wood light$-$frame bullding:

$($a$)$ Exterior wood$\_$slding

$($b$)$ Floor sheathing

$($c$)$ Roof sheathing

$12\mathrm{.}10$

You are the designer$-$builder for the house of a client who wants to avoid the use of all materals that emit VOCS. The plan of the house has a few large floor and roof spans for which solid lumber is inadequate. Which wood materials would you specify for:

$($a$)$ floor framing?

$($b$)$ floor sheathing?

$($c$)$ roof framing?

$($d$)$ roof sheathing?