Lesson 4 of 6 · Chapter 4
Wall Layout and Assembly
Layout turns the plans into marks on two boards. Get the marks right and the wall builds itself flat on the deck, stands up on its line, and takes sheathing edges exactly on stud centers. This lesson is the framer's routine from chalk line to braced wall.
Step one
Read the material
Six ideas: the chalk line, pulling stud layout, marking the openings, corners, building the wall flat, and raising, bracing and fastening it.
Idea one
Plans first, then one line
Before a mark goes down, study the plans and specifications: every wall, door and window and its dimensions.
Snap a chalk line on the subfloor where the bottom of each wall will sit. That line is the reference for everything that follows.
Double-check the measurement to the line from other walls and edges before you move on. A mistake here moves the whole wall.
The sole plate is cut to length and laid on its line; the top plate matches it.
Idea two
Centers on 16, lines at 15-1/4
Studs go 16 or 24 inches on center. 16 inches is preferred in most homes: more support and less deflection, especially behind tile in bathrooms and kitchens.
"On center" means the center of each stud lands on 16, 32, 48 and so on. A 2x4 is 1-1/2 inches thick, so its center is 3/4 inch in from its edge.
So a framer hooks the tape on the end of the plate and draws the first line at 15-1/4 inches (16 minus 3/4), marks an X past the line, and sets the stud on the X. Every stud after that is 16 inches along. The centers land on 16, 32, 48, 64, 80, 96, and the edge of every 4x8 sheet lands on the middle of a stud.
Draw the line at 16 instead and set the stud past it, and every center is 3/4 inch long: sheet edges miss the studs. Lay the two plates side by side and mark them together, so the studs meet the same marks top and bottom.
Idea three
Mark every member, not just the gap
Doors and windows interrupt the layout. Mark them from the rough opening sizes worked out earlier.
At each opening mark the king studs, the jack studs and the cripples on both plates, with a letter on each (K, J, C), so nobody puts a full stud where a jack belongs.
Mark where the header sits on both plates as well. Cripples above the header stay on the regular 16-inch layout so the sheathing still lands on them.
Check the layout against local code and the plans before a single stud is nailed.
Idea four
Solid for nailing, open for insulation
Corners are where walls meet and hold each other against lateral forces, and they must still leave something to nail the drywall to on the inside.
The traditional corner uses three studs. It is simple and strong, but it closes off a void that insulation cannot reach, a cold spot in the wall.
The California corner uses the end stud of one wall and a stud on the adjoining wall placed to leave the corner open to the inside, so insulation fills it. It saves lumber and reduces thermal bridging.
Whichever you use, mark it on the plates during layout, and check the finished corner for square by measuring the diagonals.
Idea five
Assemble on the deck
Walls are built flat on the subfloor. Cut both plates to length with clean, square cuts.
Set each stud on its mark between the plates, every crown facing the same way, and nail through the plates into the ends of the studs with a framing nailer, or screw them.
Before it goes up, check the frame for square by its diagonals, and look it over for any stud off its mark or any member missing.
Openings are built into the wall at this stage, while everything is flat and easy to reach.
Idea six
Up, plumb, braced, then nailed off
Have help. Raise the exterior walls first. Hold the bottom plate on the chalk line and tip the wall up from the top, working together and talking so it cannot run away.
Brace it at once with temporary diagonal 2x4 braces from high on the wall down to a block or stake fastened to the floor. Plumb the wall with a level, then fix the brace. Cross-bracing helps several walls in wind.
Raise the adjoining walls, check that corners and top plates meet, then the interior walls, bracing each and checking plumb.
Finally fasten the sole plate through the subfloor into the floor framing below, typically about every 16 inches, and tie the top plates together, following the nailing schedule. Every connection is part of the load path.
The whole of chapter 4 is free to read or hear on the Residential Framing reader page.
Step two
Work it with your hands on it
The Layout Bench. Set a wall length and spacing, then choose where you draw the first line: at 16 inches, or at 15-1/4. The bench places the studs and lays 4x8 sheathing over them, and shows whether each sheet edge lands on the middle of a stud.
Wall length:
Spacing
First line
Hands on it, off the screen. Take two scrap boards, lay them side by side and pull layout on both at once: hook the tape, line at 15-1/4, X past it, then every 16. Check that your 3rd mark sits at 47-1/4 and the stud center lands on 48.
In an unfinished garage, find a corner and look: three studs with a closed pocket, or an open corner?
Step three
Prove you understood it
One question per idea, a new situation every time. Miss one and you are sent back to the idea it was testing.
All six solid.
You can snap the line, pull layout so sheets land on studs, mark openings and corners, build a wall flat, and raise, brace and fasten it. Next: the roof.
Residential Framing
Lesson four of six, from chapter four. Written by our founder, Dr. Gene A Constant, and donated to the Foundation. Published by Global Sovereign University Press.
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