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DIY Academy > Framing
**ALL JOISTS MUST BE CUT TO LENGTH ON SITE**
A square deck will save you time and frustration throughout the remainder of the project. If you do not have proper 90-degree angles, you will struggle to align deck boards, borders, and fascia. Take the time to “square your deck”. Watch the video link above and read the descriptions below as Master Carpenter Pat takes you step by step through his process of framing a deck to be at proper 90-degree angles. This step can be done before you place concrete or Diamond Pier Footings – in fact it is easier to build the frame outline, then spot your footings with a plumb bob. However, if we are installing helical footings for you, this step is done AFTER helicals are installed with our tractor (height is needed for the machine).
Tools Needed: Tape measure, hammer, level, framing gun, mechanical connector gun, compressor, framing square, circular saw.
WARNING: In the videos and pictures, our carpenters use 2 different guns; a special MECHANICAL CONNECTOR (MC) gun for attaching hangars, and a FRAMING NAIL gun for nailing lumber to lumber. A FRAMING NAIL gun CANNOT be used to attach hangers. Any attempt to use a nail gun to attach metal hangars can lead to serious injury. Always wear eye and ear protection.
1 ½” / 3″ Hot-Dipped Galvanized Joist Hanger Nails: These nails must fill every hole on the hanger tabs and are attached straight into the ledger/beam.
NOTE: Each regular joist hanger uses two different nails.
Install concealed hangar at corner.
Cut a temporary 2×4 with diagonal ends to brace the rim. Attach under the Ledger first.
Measure between the 6 foot and 8 foot marks. Move the Rim Joist in or out until your tape measure reads 10 feet on the Rim Joist mark. Attach the diagonal 2×4 to the bottom of the Rim Joist.
Attach the outer ply of your Flush Beam to the Rim Joist. Use 4 nails or screws.
Level the Flush Beam and attach to a temporary 2×4.
Attach the other Rim Joist.
Cut columns to correct height and attach to helical/footing bracket with 3 ½” nails. Attach the upper brackets with 1 ½” nails. Posts should be plumb, but if they are slightly angled, the tolerance is 3/8” every 3 feet.
16D Galvanized Box 3½” Nails:
Your beam boards are limited to 20-foot boards or less. If your deck is wider than 20 feet, splice the beam boards (ply’s) on top of the support posts/columns. Stagger the ply’s of your beam as shown below. Do not place all of your splices over the same post/column.
In the example below (and in the video), the middle ply is spliced and centered over POST B. The inner and outer ply’s are spliced and centered over POST C. This example uses a combination of 18-foot boards and 9-foot boards to make a 27-foot beam.
Your width may vary, but as long as you stagger the ply’s and splice the beams over a post/column, you will pass inspection.
Concealed Hangers: Use on the rim joist at the ends of your ledger. Hang these before you hang the rim joist.
Regular Hangers: Use on your interior joists. Hang these AFTER you temporarily nail your interior joists to the beam and ledger (see next video)
WARNING: Bent hangers will not pass inspection. All circular holes must have a fastener.
**ALL JOISTS MUST BE CUT TO LENGTH ON SITE**
*** This method works best with a FRAMING NAIL gun.
Nail a cleat using a scrap 2×4 to the bottom of the beam. Create a lip for the joist to sit on.
Before lifting the joist in place, look down the edge of the board and identify the crown, or curve, of the board. Place the crown, or curve, UP. Use a pencil to mark the board with an arrow UP on the end of the joist.
Place one end on the cleat lip.
Lift the joist in place and temporarily toe-nail the joist by placing a nail into the side near the top at a 45-degree angle. Always wear eye and ear protection.
Add a second nail (at an angle) under the joist and into the ledger to keep the joist plumb.
Install your hangers. This can be done after you hang all of your joists with temporary toe-nailing. Remember to fill all circular holes with fasteners. If you cut a joist too short, you can still use it if the gap at each end is less than ¼”.
NOTE: Each regular joist hanger uses two different nails.
WARNING: In the videos and pictures, our carpenters use 2 different guns; a special MECHANICAL CONNECTOR (MC) gun for attaching hangars, and a FRAMING NAIL gun for nailing lumber to lumber. A FRAMING NAIL gun CANNOT be used to attach hangers. Any attempt to use a nail gun to attach metal hangars can lead to serious injury.
Always wear eye and ear protection.
Strong Ties are required. Place the 2 outer ties within 2 feet of the ends of the ledger board and equally space the remaining 2 ties in the center of the deck framing. Your kickout landing is considered a part of the main deck for this purpose.
Blocking is the secret step to flattening crowned or wavy joists. Blocking is required within 8 feet of a ledger, ideally centered between the house and the outer beam. But we recommend a distance no greater than every 6 feet to minimize the waves in your joists. After this step, your blocking will force the joists more level. If you have a 16’ deep deck, place 2 rows of blocking equidistant between the house and outer beam, at approximately 5.33’ apart.
In this video, master carpenter Pat blocks a deck with a DOUBLE PICTURE FRAME and a SEAM BOARD running down the center of the deck
In a SINGLE PICTURE FRAME layout, insert a 2×4 in between the joist blocking to catch the ends of the main deck boards.
Railing posts will be “surface mounted” and supported with lag screws into the frame. Now is the best time to add horizontal blocks at future railing post locations. We recommend applying joist tape over any large flat areas that will collect water. We recommend doubling up the blocks because your railing post screws are 4″ to 5″ long. One board at 1.5″ thick is a minimum, but 3″ is ideal. This blocking also catches the ends of the mitered picture frame boards and the end screws.
Attach angled stair brackets first, then attach stringers to brackets.
Use the stringer spacing requirement approved on your permit drawing.
Go to the spot where your stairs will land and measure the height to the top of the frame. Add 1” for future decking. This deck frame PLUS decking was 89”.
CALCULATE YOUR STAIR RISE:
EXAMPLE DECK HEIGHT: 89” (Deck frame was at 88” but we add 1” for decking thickness.)
Use 2×12 boards
RISE: Max = 7-¾” / Min = 4”
RUN = Min 10”
BULLNOSE = ¾” – 1 ¼”
STRINGER SPACING = Between 6-10” (refer to permit)
USE A 2×10 base plate for all stringers to land on.
Remember to cut one less step and use your deck as the final step.
To draw your lines on your 2×12 stringers, use brass stair gauges on a steel framing square.
We like attaching the gauges on the outside of the square and drawing our lines on the inside of the square.
In this example, we placed the gauges on the outside of the square so that the inside of the gauge intercepted the edge of the 2×12 at 10” (RUN) and 7-3/8” (RISE).
Slide the square to the next position and line up 11 ½” on the previous pencil mark. 11 ½” is on the outside edge, opposite your 10” mark (inside edge).
Cut 1 ½” off the bottom heel for the 2×10 base plate (required).
Cut the stringer with a circular saw. Be careful not to overcut the inside corners. Use a hand saw or multipurpose tool to trim out the extra material left inside the inside corners.
Cut the stringer with a circular saw. Be careful not to overcut the inside corners. Use a hand saw or multipurpose tool to trim out the extra material left inside the inside corners.
Mark the RISE on your deck where the stringer will attach. In this example: 7 3/8”.
Attach a horizontal backer board along the back of the deck frame using vertical supports. If you already have a double rim joist, double up the horizontal boards to make the extra beam flush.
