1. Wood Construction
CTC-375

2. Wood
Lumber
Any wood cut into a size and shape used as a building material
Timber – lumber with smallest dimension >5”
Board - <2” thick, at least 2” wide
Dimension - >2” thick, <5” thick, 2+” wide
Beam & stringer - >5” thick, 8”+ wide
Post & Beam – lumber approximately square
5+” thick and wide

3. Available in sizes from 8 – 16 feet
Rough sawn lumber
Sawn on all four sides to a nominal thickness and width
Dressed lumber
Sanded on 1 -4 sides
Called by nominal size
Sanding takes ¼” off per side
Available in sizes from 8 – 16 feet
Studs also available at 92” – gives 8’ ceiling height

4. Types of wood construction
Post & Beam
Wooden frame provides structural support
No interior bearing walls
Posts must be attached to foundation
Balloon Framing F 13-4
Exterior walls are continuous from foundation to roof
Floors are attached to the walls
Revived in 1980’s as solar power gained popularity
Need to place fire breaks in the walls

5. Platform Framing F 13-3 Walls rest on floors
Floor is built to edge of foundation then sheathed
Wall is built on top of floor
Walls have single bottom plate and double top plate for strength
Fire blocks at every floor

6. Panels or module construction
Structural Insulated Panels (SIP)
Can be walls or roof systems
Conventional floor system but walls are constructed off site in 4x8 panels and hauled to site
Allows for windows, doors to be installed at same time as walls
Must have a flat surface

7. Construction Hurricane clips for roof
Anchor bolts and tie downs for foundation-frame connections
Blocking
Where do you place blocking?
Joist Bridging
Makes floor into a system

8. Floor Systems Conventional 2x construction Engineered Lumber
Box beam surrounds joists
Girders are built up from 2x stock
Joists are 2x stock 16” o.c.
¾” sheathing is glued and screwed onto joists
Can use 5/8” sheathing but total floor must = 1.25”
Engineered Lumber
I-joists – 2x3 top & bottoms with OSB web
Long and strong
Can span 40 – 60 feet – eliminates interior bearing walls

9. Floor Trusses Holes in Joists Usually used in commercial buildings
Provide long spans
Holes in Joists
Holes only in center of joist (neutral axis) and only within 1/3 of span of end
Diameter not more than 1/3 of height or be closer than 2” from an edge

10. Roof Trusses Components F 13-12 Truss types F 13-13 Erection F 13-14
Bracing F 13-15

11. Timber Construction F 13-24 Post and beam on a larger scale
Connections F 13-25