Home construction techniques designed to reduce the amount of lumber used and waste generated in the construction of a wood-framed house. Advanced framing techniques improve a home’s energy efficiency and create a structurally sound home with lower material and labor costs than a conventional frame house. Additional construction cost savings result from reduced waste disposal, which also helps the environment. Advanced framing actually replaces lumber with insulation material to maximize the wall area that’s insulated, which improves the whole-wall thermal resistance or R-value. (Yudelson)
This is an example of stacked 24" on center framing. The studs stack on floor joists, ceiling joists stack on studs, and roof rafters stack on studs.
2 Stud Corner
A 2 stud corner along with ladder blocking (not shown) made from drop lumber can be used and save a full length stud.
Ladder Blocking At Interior Wall
When interior walls T into another wall, ladder blocking can be used from drop material to save on full length studs. The ladder blocking allows for sheetrock to be fastened without the need for extra studs or clips.
2 Stud Corner with Ladder Blocking
With 2 stud corners, ladder blocking can be used from drop lumber to save using full studs. Studs at corners are spaced 12" O.C. to resist negative pressure.
2x4 Blocking For Nailer
When nailers end up running parallel to floor framing, blocking is needed so that when the SIP sole plate is bolted, there is no upturning.
Ripped 2x2 Sill for Porch Joists
By using a ripped 2x2 treated sill piece nailed to the ledger, porch joists can be attached and nailed without using costly joist hangers.
Advanced Framing can:
- Reduce the quantity of required lumber by up to 30% without compromising structural integrity
- Reduce material and labor costs
- Reduce Thermal Bridge Thermal Bridging is when heat is transferred due to materials that act as poor insulators. For example, wooden or steel studs in a wall cavity create a thermal bridge to both the inside and outside because of their poor insulating properties compared to the insulation in a wall cavity.by providing fewer members that allow Heat Transmission Occurs when heat energy is transferred through an object. A good example of this is a metal spoon in a boiling pot of water. Because metal is a great conductor of heat energy, the spoon gets hot quickly. through the ThermalThe Thermal Envelope (also Building Envelope) is the “skin” of a home. A major factor in the energy efficiency of the home, the building envelope is responsible of proper ventilation, protection from the outside elements and moisture control. It consists of the structural materials and finishes that separate the inside of the home from the outside, including windows, walls, doors roofs and floor surfaces. (Yudelson) EnvelopeThe Thermal Envelope (also Building Envelope) is the “skin” of a home. A major factor in the energy efficiency of the home, the building envelope is responsible of proper ventilation, protection from the outside elements and moisture control. It consists of the structural materials and finishes that separate the inside of the home from the outside, including windows, walls, doors roofs and floor surfaces. (Yudelson)
Common concerns about advanced framing include:
- Many framers do not know these techniques and must be trained, slowing construction time and adding cost.
- Construction drawings need to be more detailed.
- Extensive planning and engineering is needed before construction begins.
- Advanced framing requires increased site supervision, which can lead to higher construction costs.
Some characteristics of Advanced Framing include:
- Structural Members are laid out 24” on center instead of the typical random placement at 16” on center.
- Top Plates Horizontal 2x material at the top of a wall system that is fastened to the foundation. It holds the vertical studs in alignment and creates space for drop ceiling members or second floor joists to rest. are single instead of the typical Double PlatesTop or sole plates installed at either the top or bottom of the stud wall that are doubled up.
- Top plates are joined together by Scabbed Material Scrap lumber used to splice two members together to add additional strength. or Steel Splice PlatesMetal plates used to join two wooden members together where they butt into each other.
- All structural members are stacked from structural floor foundation to studs then to rafters, creating a “direct” load path.
- Typical 3 Stud Corners become 2 Stud Corners with Ladder Blocking to support interior gypsum board
- Jack StudsShortened studs that sit under a header and transfer load down to the sole or bottom plate directly or through the sill or saddle on a window. and Headers2x material installed over the top of the door to transfer the load of the wall above the door to the studs framing the door. at doors and windows are revised to span to studs aligned with floor structure
Make It Right began building our homes using wood studs and conventional framing techniques on Exterior Walls, Interior Walls, and all other site-framed structural assemblies. We later embraced Advanced Framing as a way to substantially reduce materials and cost.
After an initial investment in training, administration, engineering and construction documentation, we’ve seen cost-savings and increased efficiency using Advanced Framing. Because Make It Right replicates designs, Advanced Framing has paid off for our projects. Today we use Advanced Framing in the site-framed assemblies like floor, interior wall and ceiling frames. Our Exterior Wall and Roof structural components are now OSBOriented Strand Board is an engineered wood product formed by layering strands (flakes) of wood in specific orientations. Has a rough and variegated surface with the individual strips (2.5 x 15 cm / 1 x 6 inch) lying unevenly across each other. SIPStructural Insulated Panels..
New Orleans' builders are mostly familiar with conventional building methods; training in Advanced Framing was essential for the construction crews Make It Right hires. Make It Right has trained close to 100 local workers in advanced framing and these workers now have cost and material-saving skills that can be passed on to other homebuilders in the region.
When using Advanced Framing, framing carpenters must pay close attention to the framing layout. All structural members stack; on doors and windows, sometimes Headers2x material installed over the top of the door to transfer the load of the wall above the door to the studs framing the door. appear where they should not.