LARE Exam 4 QUESTIONS & ANSWERS 100% VERIFIED!!

What are the 4 distortions commonly found in board lumber? - ANSWERCupping (along the width of the board), Bowing (along face), Crooks (along the edge) and twisting occur along the length. What does "bark side up" refer to when laying decking boards? - ANSWERLaying decking boards with growth rings facing down and with the convex side up, preventing the board from entrapping water. What is the optimum moisture content for lumber stability in a structure? - ANSWER12% What 5 pieces of information are listed by lumber-graded marks? - ANSWER1. grade designation (quality) 2. species identification 3. max. moisture content at the time of surfacing 4. the grading agency responsible for inspection 5. mill identification Lumber grades are divided into which 4 performance standards? - ANSWERlight framing, structural light framing, structural joists and planks What do S-GRN and S-DRY mean? - ANSWERS-GRN = surfaced green and indicates that the board was milled with a moisture content above 19% and it is cut slightly oversized so that when dried to a 19% moisture content it will have the same dimensions as S-DRY planed at 19% or less. How is solid lumber for engineered components graded? - ANSWERMechanically and designated as MSR (Machine Stress Rated). They are both visually and mechanically tested. Stamps indicate species and assign one of 4 grades and give two stress measurements. What are the two stress measurements for solid lumber used for engineered components? - ANSWER1. The fiber stress bending F(b) is a measure of tensile and compressive forces. 2. Modulus of elasticity (E) how much deflection will occur under certain loads. Measures stiffness of wood member. What are the 4 grades assigned to structural lumber? - ANSWERconstruction, standard, utility and stud