Step 7: Attach Trim and Decking

Tom Silva building an on-grade deck
Photo: David Carmack
«»
Nail paint-grade trim boards as wide as the rim joists to their outside faces with two 8d hot-dipped galvanized or stainless finish nails spaced every 12 to 16 inches. Scarf any joints in the run; miter joints at the corners.

Measure the distance from the wall to the outside of the trim board and add 1 inch for overhang. Cut the deck boards to this length.

Squeeze a bead of polyurethane marine sealant on the top edge of a side rim joist. (This adhesive actually fastens the decking in place.) Lay a straight deck board in the adhesive so its long edge overhangs the trim board by 1 inch. Secure each end of the deck board with an 8d finish nail.

Tack 8d finish nails into the joists alongside the first board to maintain consistent spacing. Squeeze dabs of adhesive onto the top edge of each joist. Lay and nail the next deck board as before. Continue gluing and nailing until the deck is complete. (Add more nails only if a board does not lie straight or flat.)

Replace the house‚Äôs siding to within ½ to 1 inch of the decking.

TIP: Decking laid at right angles to the house makes for a stronger front edge.
Ask TOH users about Decks

Contribute to This Story Below

    Tools List

    • hammer drill
      Hammer-drill with masonry bit
    • drill
      1/2-inch drill with 3/8-inch bit
    • socket wrench
      Socket wrench
    • plumb bob
      Plumb bob and string
    • circular saw
      Circular saw
    • two-foot level
      Level
    • chalk line
      Chalk line
    • concrete mixer
      Concrete mixer,
      or mixing trough and hoe
    • hammer
      Hammer
    • impact wrench
      Impact wrench
    • flat blade shovel
      Shovel
    • 16-foot tape measure
      Tape measure
    • utility knife
      Utility knife

    Shopping List

    1. 5X4-INCH DECKING LUMBER

    2. 2X8 PRESSURE-TREATED LUMBER for the joists

    3. 2X10 PRESSURE-TREATED LUMBER for the ledger, beams and rim joists

    4. FIBERBOARD PIER FORM

    5. PLASTIC FOOTING FORM

    6. CONCRETE

    7. LEDGER FASTENERS lag screws and/or carriage bolts

    8. POLYURETHANE MARINE SEALANT

    9. FACE-MOUNTED JOIST HANGERS

    10. POST BASES

    11. MASONRY EXPANSION BOLTSto fasten post bases to concrete piers

    12. SILICONIZED ACRYLIC CAULK

    13. METAL FLASHING

    14. 6D, 12D, AND 16D GALVANIZED OR STAINLESS STEEL COMMON NAILS

    15. 8D GALVANIZED OR STAINLESS STEEL FINISH NAILS

    16. 5/8-INCH ROOFING NAILS

    17. SELF-ADHERING WATERPROOF MEMBRANE

    18. CONCEALED-FLANGE AND FACE-MOUNTED DOUBLE JOIST HANGERS AND HANGER NAILS

    19. CONSTRUCTION ADHESIVE