1. Platform Construction Construction Mr. O

2. Platform Construction For use in construction jobs where a house is built over a basement or crawl space. For use in construction jobs where a house is built over a basement or crawl space.

3. Floor Sills Sills lie on top of foundation Sills lie on top of foundation Bolted in place Bolted in place Insulation between sill and foundation Insulation between sill and foundation

4. Floor Joists 2x10 or 12s’ set on edges (vertical) 2x10 or 12s’ set on edges (vertical) Rest on floor sills Rest on floor sills Outside joists called stringers Outside joists called stringers Perpendicular joists Perpendicular joists called Headers Nailed in place Nailed in place MFG’d called I-Joists MFG’d called I-Joists

5. Floor Joists (Cont’d) Long lengths require doubling up Long lengths require doubling up Support at meeting points and stress points from girders Support at meeting points and stress points from girders Girders held by Girders held bycolumns/posts

6. Joist Spacing 12” or 16” O.C. 12” or 16” O.C. Why not 24”? Why not 24”? Compensate Compensate for staircases for staircases

7. Platform Construction Provides nailing base for subfloor and walls Provides nailing base for subfloor and walls Repeat for each story built Repeat for each story built Walls become load bearing rather than foundation Walls become load bearing rather than foundation