6. What is meant by a span rating of 32/16? What types of wood products are rate

Question

6. What is meant by a span rating of 32/16? What types of wood products are rated this way?

7. What are the 3 most common nail sizes used in light frame construction?

8. What is a "Glulam" beam? What is a specific application where a glulam member would be advantageous and why?

9. Why does Heavy Timber construction receive relatively favorable treatment from building codes and insurance companies?

10. How is 'floor sag' due to wood shrinkage prevented in a building of Mill construction? Provide both a historically used solution and a modern solution.

Explanation / Answer

7)common wire nails,box nails and common wire spikes.

6)Span rating system is to permit the use of different woods. 32 is the allowable span in inches between centers of rafters when used roof sheathing. 16 is the allowable span when used as subflooring. Panel will be placed perpendicular to the length.

8)gulam is defined as a material that is made from suitably selected and prepared pieces of wood either in a straight or curved form,with the grain of all pieces essentially parallel to the longitudinal axis of the member

gulam has several distinct advantages in size capability,archetectural effects,seasoning,grades and effect on the environment.

9)Heavy timber framing receives relatively favorable fire ratings because large timbers catch fire and burn relatively slowly compared to wood light frame construction and do not lose strength as quickly as unprotected steel members during fire.After a fire that is not too severe,it is often possible to sand the char off a heavy timber beam or column,and allow it to continue in use

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