When a ledger is installed to strengthen a stair assembly, treated lumber must be used if the ledger is _____

a. less than 2? in thickness
b. fastened with lag screws
c. in an area of high humidity
d. fastened to a concrete floor


d

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Is the effective R-value of the following two walls the same or different? Explain.

(a) A 4-in.-thick metal stud wall with studs spaced 24 in. on center and 4-in-thick fiberglass insulation between studs. (b) A 4-in.-thick metal stud wall with studs spaced 12 in. on center and 4-in-thick fiberglass insulation between studs.

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Discuss three organic variables that must be considered prior to the application of

an herbicide.

What will be an ideal response?

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The spacing between the electrode tip and the nozzle tip is called the ____________________.

Fill in the blank(s) with the appropriate word(s).

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The acronym DEF stands for ________

A) Double efficiency fuel system B) Diesel engine fan C) Diesel exhaust fluid D) Di-ethylene fuel

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