Module 27105-06 Floor Systems

Platform or western or box frame 1. What is the name of the type of construction where each floor of a structure is built as an individual unit (Page 5.2, Section 2.1.0)? Answer Platform or western or box frame

Because of lumber and labor costs (too expensive) 2. Why is balloon frame construction rarely used today (Page 5.4, Section 2.3.0)? Answer Because of lumber and labor costs (too expensive)

3. What architectural drawings have information relevant to building the floor assembly (Page 5.7-11, Section 3.1.1-3.2.0)? Answer Foundation plan, Floor plan, Section and Detail drawings, Structural drawings, and plumbing, mechanical, and electrical plans

4. What plan would most likely contain the information needed to correctly position the opening in the floor for a stairway (Page 5.7, Section 3.1.2)? Answer Floor Plan

5. Where, on a set of plans, would you look for the quality of materials and methods of construction for a floor assembly (Page 5.12, Section 3.4.0)? Answer Specifications

A single layer of 2 X 6 lumber 6. What type of lumber are floor sills are normally made from (Page 5.12, Section 4.1.0)? Answer A single layer of 2 X 6 lumber

7. What is the framing member that the letter H is pointing to (Page 5 7. What is the framing member that the letter H is pointing to (Page 5.13, Section 4.0.0 Figure 6)? H Answer Sheathing

8. What is the framing member that the letter C is pointing to (Page 5 8. What is the framing member that the letter C is pointing to (Page 5.13, Section 4.0.0 Figure 6)? C Answer Double Joist

Cross or Wood “X” bridging 9. What is the framing member that the letter G is pointing to (Page 5.13, Section 4.0.0 Figure 6)? Answer Cross or Wood “X” bridging G

10. What is the framing member that the letter N is pointing to (Page 5.13, Section 4.0.0 Figure 6)? Answer Anchor bolt

11. What is the framing member that the letter Q is pointing to (Page 5.13, Section 4.0.0 Figure 6)? Answer Solid Bridging

12. What is the framing member that the letter E is pointing to (Page 5.13, Section 4.0.0 Figure 6)? Answer Joist Hanger E

13. What is the framing member that the letter D is pointing to (Page 5.13, Section 4.0.0 Figure 6)? Answer Girder D

14. What is the framing member that the letter A is pointing to (Page 5.13, Section 4.0.0 Figure 6)? Answer Pier A

15. For a given size, what type of support has the most strength (Page 5.16, Section 4.2.4)? Answer Steel I-Beam?

16. What is the rule of thumb for constructing girder pockets (Page 5 16. What is the rule of thumb for constructing girder pockets (Page 5.18, Section 4.2.5)? Answer Be 1” wider than the beam and the beam must have 4” of bearing on the wall

17. Describe how wooden joists are normally placed in relation to their centers and their crown (Page 5.20, Section 4.3.0)? Answer Crown (curve) up and 16” from joist center to next joist center (16” O.C. - on center)

18. What does the term dead load refer to (Page 5.20, Section 4.3.0)? Answer The weight of permanent, stationary construction and equipment included in a building exerting a downward force on the building or framing member.

18. What type of floor joist has the most strength for a given length and size (Page 5.24, Section 4.3.3)? Answer Truss with a steel web

Intervals of no more than 8’. For spans from 8’to 16’ one row required 20. What is the interval distance that most building codes require that bridging be installed in rows between floor joists (Page 5.24, Section 4.4.0)? Answer Intervals of no more than 8’. For spans from 8’to 16’ one row required

21. What is underlayment (Page 5.25, Section 4.5.0)? Answer Material such as particleboard or plywood installed over the top of the subfloor to provide a smoother surface for finish floor materials.

22. What type of fastener should be selected to fasten wood cross-bridging and subfloor material (Page 5.30, Section 5.3.0)? Answer 8d nail

23. What type of fastener should be selected to fasten headers to joists (Page 5.30, Section 5.3.0)? Answer 16d nail

24. What measuring tool can be used to lay out the angles of wood “X” bridging (Page 5.37, Section 5.10.0)? Answer Framing Square

25. How far apart should the nails be spaced along the edges of sheathing (Page 5.37, Section 5.10.0)? Answer 6” apart

Refer to the illustration to answer the following questions. When you see a statement like this…

imagine this and… Sill Beam or Girder Pier Foundation

this and… Solid Bridging Joist

this! Sheathing

26. How many lineal feet of 2 X 6 sill material would be needed (Page 5.40, Section 7.1.0)? Answer Perimeter – total of the length of the 4 sides - (2 X 52’)+(2 X 32’) = 168’

27. How many lineal feet of 2 X 12s are needed for the beam (girder) (Page 5.40, Section 7.2.0)? Answer Length X 3 – (3 X 52’) = 156’

28. How many 2 X 8 joists are needed if the joists are spaced 16" OC (Page 5.40, Section 7.3.0)? Answer Use formula – (3/4L +1) where L equals building length. Because joists will only reach 16’ and the floor is 32’ wide the result must be multiplied by 2. So, 2(3/4L+1)…….. 2((3/4 X 52)+1) = 2(39 +1) = 2(40 ) = 80 joists

29. How many lineal feet of 2 X 8s are needed for the joist headers (Page 5.40, Section 7.3.0)? Answer Length of one side + length of other side (at the head or end of the joists) 2(L)… 2(52’) = 104’

30. How many lineal feet of 2 X 8s are needed for solid bridging (Page 5.41, Section 7.4.0)? Answer Joist span is 16’ or less so one row is needed for each set of joists from sill to girder. 2(L)… 2(52’) = 104’

31. How many 4' X 8' panels of subflooring are needed (Page 5 31. How many 4' X 8' panels of subflooring are needed (Page 5.41, Section 7.5.0)? Answer Surface area = L X W for a rectangle so 52’ X 32’ = 1664 sq. ft.. Divide that by the number of sq. ft. of surface in on one panel of sheathing (4’ X 8’ = 32 sq. ft.) 1664 sq. ft. / 32 sq. ft. = 52 panels needed

End of Presentation