Wood Framing F 09

Light Wood Frame Construction

Framing Methods

Floor Systems

Wall Systems

Roof Systems

Wood Terms

IBC - Type 5 Construction

Professor Richard Luxenburg, AIAAnne Arundel Community CollegeDepartment of Architecture and Interior Design

Fall 2009

Larger (5”x5” min) and fewer members (spaced further apart 2’,4’,6’, 8’o.c) IBC - Type 4 Construction (different code requirements) Diagonal bracing or rigid connections required for lateral stability Exposed construction (no cavities) Tends to be Very Expensive – guess why?

LWF (light wood framing) is Not Heavy Timber

Heavy Timber is:

Light Wood Frame Construction………………………….(like a light balloon!)http://www.canforcentre.com/system.html

Light Wood FrameFloor Systems

Wood Joist System Relatively small joist members

(2 x10 etc.) closely spread

(12”, 16”, 24” o.c) Short spans for subflooring,

underlayment and gypbd. clg. Joists supported by

beams or walls Flexible in form & shape

(unlike grid of post & beam)

Heavy Timber section of a light wood framed (LWF) house.

House-wrap (Dupont Tyvek) over panelled sheating. Explain why! Moisture/air infiltration.

http://www.tyvek.com/whatistyvek.htm

http://www2.dupont.com/Tyvek_Construction/en_US/products/residential/products/thermawrap.html

Project No. 1Here’s a project you’re going to have to do this semester!So pay attention!

That’s a student’s bass wood (not balsa wood) model!

Wall Systems

Wood Stud Walls• 2 x 4’s or 2 x 6’s• 16” or 24” o.c.• Insulation• vapor barriers• Interior finish (gypsum)

Framing Methods

Studs sit on a platform of plywood

(decking/sheathing) between floorsStuds continue from foundation to roof

PlatformBalloon Framing

Framing Methods - Balloon Frame

Framing Method - Platform Framing

Wood Terms

Joist: horizontal or sloped framing member

Rafter: sloping framing member for the roof

ceiling joist

floor joist

stud

rafter

Stud: vertical framing member

• Beams• Columns

“Stick built”– not using pre-fab trusses(like the next slide) but instead using individual 2x rafters

re - Engineered lumberGlulam (Glued Laminated Timber) I-joist LVL (Laminated Veneer Lumber) OSB (Oriented Strand Board) Plywood Rim Board Siding Specialty Wood Products              

•Glulam (Glued Laminated Timber) •I-joist •LVL (Laminated Veneer Lumber) •OSB (Oriented Strand Board) •Plywood •Rim Board •Siding •Specialty Wood Products              

Engineered Wood & Lumber – not found nature

Header Sill Cripple/Jacks

sill

header

cripple/jacks

sill cripple/jacks

stud

jack stud

bottom plate

top plate

Plates - Horizontal members at top & bottom of studs

@ Sill

@ Wall

@ Foundation

stud

bottom plate

top plate

Wood Terms• Blocking

Solid piece of isolated wood (stud) placed between framing members (walls, floors, roofs).

Usually for support or attachment of something else.

blocking

Bridging Material between framing members (continuous) to evenly distribute loads Keeps framing members from twisting

Solid blocking Diagonal bridging

• Wood• Metal

blocking

bridging

Sheathing - material covering the framing members (roof, floor & walls)

Plywood (typically 4’ x 8’ modular sheets) roll sliced lumber OSB (oriented strand board) reconstituted (recycled) wood Boards (cut lumber)

http://www.rd.com/content/openContent.do?contentId=17535&pageIndex=1

http://www.canply.org/english/products/manufacturing/manufacture.htm

http://www.afrc.uamont.edu/pattersond/Coursework/Undergrad/plywood.htm

http://www.apawood.org/level_b.cfm?content=prd_main

http://www.apawood.org

http://www.ainsworth.ca/pdf/products/ans_osb06.05.pdf

The true measurement of a 2x4 is actually about 1.5x3.5. When the board is first rough sawn from the log, it is a true 2x4, but the drying process and planing of the board reduce it to the finished 1.5x3.5 size. The lumber is then sold as a "2x4" because the cost of the drying and machining are figured in ... it is also much easier to refer to a board as a "2x4", rather than a "1.5x3.5".

Soundproofing Products Acoustiblok® is a unique 1.1 lb. psf U.L. Classified, high S.T.C. reinforced dense noise isolating

material for reducing sound transmission. is approved by U.L. for walls, ceilings and floors (see U.L. classification. It is usually stapled to wood studs

Each layer of 16 oz Acoustiblok® reduces sound transmission by as much as 30 db depending on the frequencies. 

A typical 2 x 4 gypsumboard stud wall is usually 33 to 35 STC. Acoustiblok® installed in the 2 x 4 wall is lab certified at an amazing "STC of 52", better than 12" of poured concrete (STC 51).

http://www.ainsworth.ca/pdf/products/ans_osb06.05.pdf

Floor Systems

Flo

or S

yste

ms

Floor SystemsSheathing

Floor Systems - Floor Projections

Floor Systems - Floor Openings

Floor Systems - Partition Connections

Partition parallel to

joists

Partition perpendicular to joists

Partition perpendicular to joists

Partition parallel to

joists

Floor Systems - Partition Connections

Partition perpendicular to joists

Partition parallel to

joists

Floor Systems - Partition Connections

Wall SystemsCorners & Partition Intersections

Wall SystemsDoor & Window Openings

Wall Systems - Wood Stud SheathingStuds @ 12” , 16” or 24” o.c.- Leaves Void spaces for insulation and space to run electrical and mechanical lines

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