Understanding Door Framing
Proper door framing ensures smooth operation and structural integrity.
- Rough Opening Space for installation and adjustment.
- Header Support Load distribution above door.
- Jamb Requirements Frame stability and mounting.
- Clearances Operating space needs.
Design Considerations
Wall Type
Load bearing factors.
Door Style
Opening requirements.
Structural Load
Support requirements.
Clearance
Operation space.
Material Guide
- Headers Load support beams.
- King Studs Full-height support.
- Jack Studs Header support posts.
- Jamb Material Frame components.
Installation Best Practices
- Leveling Plumb and square frame.
- Shimming Proper adjustment methods.
- Fastening Secure mounting techniques.
- Sealing Weather protection.
Structural Engineering
- Load Analysis Dead load: 40-50 lbs/ft². Live load transfer: 20-30 lbs/ft². Wind load: 20 psf. Seismic drift: 0.7% height. Point load capacity: 300 lbs.
- Member Design King stud: 2×4/2×6 min. Jack stud: full height. Header span: L/360 deflection. Trimmer capacity: 1,100 lbs/ft. Sill plate: 2× width.
- Connection Details Nailing pattern: 16d @ 12" O.C. Bolt edge distance: 1.75". Anchor spacing: 6' max. Shear transfer: 850 lbs/ft. Uplift resistance: 450 lbs.
Material Properties
- Lumber Specifications Fb: 875-1,000 psi. E: 1.4-1.7×10⁶ psi. Fc⊥: 425 psi. Specific gravity: 0.42-0.46. Moisture content: 15-19%. Grade: #2 or better.
- Hardware Requirements Fastener yield: 90 ksi min. Coating: G185/HDG. Withdrawal: 150 lbs/in. Shear capacity: 350 lbs/fastener. Bearing enhancement: 1.8×.
- Thermal Properties R-value: 3.8/inch. Thermal bridging: 0.5 factor. Air infiltration: 0.3 cfm/ft². Vapor permeance: 1.0-3.0 perms. Condensation resistance: 50+.
Installation Standards
- Dimensional Tolerances Plumb: ±1/8" in 8'. Level: ±1/16" in 4'. Square: ±1/8" in diagonal. Reveal: 1/8" uniform. Joint gap: 1/16" max.
- Assembly Sequence Rough opening: +2" width/height. Shim spacing: 4" from corners. Support points: 12" max. Fastener depth: 1-1/4" min. Flash lap: 4" min.
- Quality Control Load test: 1.5× design load. Operation force: 5 lbs max. Air leakage: 0.3 cfm/ft². Water penetration: 15 min @ 2.86 psf. Cycle test: 25,000.
Performance Criteria
- Fire Rating Assembly rating: 20-90 min. Flame spread: Class C. Smoke development: <450. Temperature rise: <450°F. Through-penetration: F-rating equal to wall.
- Acoustic Design STC rating: 35-45. Impact isolation: IIC 50+. Flanking transmission: <5 dB. Resonance frequency: >100 Hz. Absorption coefficient: 0.15-0.25.
- Energy Performance U-factor: 0.35-0.55. Solar heat gain: 0.25-0.40. Air leakage: <0.3 cfm/ft². Condensation resistance: 50-65. Visible transmittance: 0.40-0.60.