DOCK SPECIFICATIONS

Dock Specifications

MJS Dock Service is a Full Service Dock Company.
We have been in business serving Lake Arrowhead for 20 years.

New Dock Features:

Trex Decking Surface

  • Docks are decked with high grade 2x6 Trex Wood-Polymer Composite Low Maintenance Decking (actual measurements are 1 1/4 x 5 1/2 ).
  • Decking is fastened with # 10 2.5" galvanized deck screws or better.

Beam Frame

  • 4"x10" Microlam Beam framed heavy duty structure.
  • Pressure treated or sealed interior frame
  • Solid rounded Microlam 7" x10" finger ends
  • Docks are bound together with heavy-duty, through bolted, hot dipped galvanized or rustolium coated steel brackets supporting all major joints.
  • **COMPARISON BETWEEN 3X10 GLUE LAMINATED BEAMS AND MJS RECOMMENDED 4"x10" MICRO LAMINATED BEAMS
    MJS Dock Service Dock Specifications
    MJS Dock Service Specifications

    Frame

    OPTION 1: 3"x10" Glue-Laminated Beam framed structure (actual beam measurement: 3 1/8" x 10 1/2").

    OPTION 2: Micro-Laminated Parallel Strand Beam Frame (actual beam measurement: 3 1/2" x 9 1/2").

    NOTE: MJS strongly recommends using a 4" x 10" Micro-Laminated Beam Frame (Micro - Laminated) instead of the Glue-Laminated Beam Frame (Horizontally Laminated), for the following reasons:

    1.  The 4" x 10" Micro-Laminated Beam has higher engineering values. It has both a higher bending strength and a higher shear strength as can be seen by the following values: 

    OPTION 1: 3"x10" Glue-Laminated Beam allowable design stresses:
         A) bending strength = 2400 psi
         B) shear strength = 165 psi

    OPTION 2: 4" x 10" Micro-Laminated Parallel Strand Beam allowable design stresses:
         A) bending strength = 2900 psi (BETTER)
         B) shear strength = 290 psi (BETTER)
    Note: Higher values are better.

    These figures show that the 4" x 10" Micro-Laminated Parallel Strand Beam is a stronger and more rigid beam than the 3" x 10" Glue-Laminated Beam. This means you will have a much sturdier dock and less finger movement.


    2. The 4" X 10" Micro-Laminated Parallel Strand Beam is actually thicker than the 3" x 10" Glue- Laminated Beam . The actual sizes are:

    OPTION 1: 3" X 10" Glue-Laminated Beam = 3 1/8" x 10 1/2"

    OPTION 2: 4" X 10" Micro-Laminated Parallel Strand Beam = 3 1/2" X 9 1/2" (BETTER)


    3. The 4" x 10" Micro-Laminated Beam will not twist, shrink, or split like the 3" x 10" Glue-Laminated Beam . As can be seen by comparing the North Shore Marina's "Snack Bar Dock" and "Rental Docks" (framed with standard Glue-Lam Beams) with any of the "Village Docks" (framed with Micro-Lam Beams.) Dock fingers are to long for a standard glue lam they will twist. An under water jack support system was later required to be installed onto the Marina "Snack Bar Dock" when the fingers began to twist.


    4. The 4" x 10" Micro-Laminated Beam is vertically Laminated with hundreds of 101 inch long plies and the 3" x 10" Glue-Laminated Beam is Horizontally Laminated with ~ 7 lams. (MORE LAMINATES ARE BETTER). The hundreds of micro lams are what gives the 4" x 10" Strand-Laminated Beam more strength. Also, the horizontally laminated beam is not engineered to safeguard against the possibility of delamination, where the micro - laminated beam is backed up by though bolts and brackets spaced approximately every four feet after dock construction.


    5. The 4" x 10" Micro-Laminated Beam Frame Dock is a lower profile dock. This helps assure that lower profile boats will not rub underneath the padding, thus adding protection for those boats. We switched to the lower profile frame shortly after we switched to16 inch thick floats from the older 12 inch thick floats. Our docks sit 3 inches higher from the water than the older docks while the top of the dock is at the same level as the older docks. A 10.5 inch frame combined with a 16 inch float results in a higher deck and padding level, thus a padding boat level problem.


    6. Standard Glue-Lam Beams have a higher shrinkage rate than a Micro-Lam Beam . This can result in loosening joints and sheared and broken screws. Using the Micro-Lam Beams lower the risk of these problems.

    Sealers

    1. Dock trims and beam interiors are sealed with semitransparent "Lifetime 30 year" brand silicon rubber based water repellent stain, "Cabet" sealer or "Super Deck" U.V. sealer.

    Frame Fasteners

    • Galvanized or rustolium coated steel brackets support all major joints
    • 4" x 8" x 1/4" galvanized or rustolium coated steel brackets support all beam to beam connections
    • 2" x 8" x 1/4" galvanized or rustolium coated steel brackets support all beam to 2" x 10" connections
    • All bolts to be zinc plated - minimum 3/8" diameter on all beam to 2" x 10" connections
    • All bolts to be zinc plated - minimum 1/2" diameter on all beam to beam connections
    • All bolts to be secured with washers and lock washers or lock nuts
    • Framed with 16d hot dipped galvanized box nails

    Flotation

    1. 16 inch thick EPS foam filled ACE Rotational Molded Float Drums**

    **ACE ROTATIONAL MOLDED FLOAT DRUMS :
    These floats have a minimum .150 wall thickness and are rotational molded from virgin food grade materials with UV inhibitors assuring long life. The polyethylene shell with molded mounting slots, is unaffected by saltwater, oil, gasoline, and most chemicals. The floats are completely foam filled using a 1 to 1.5 density EPS. These floats meet Corps. of Engineers Regulation #36 CFR Part 327.

    Fenders and Padding

    • Real 4 inch wide fire hose padding around all slips blind stapled on top
    • Padding will be fastened with 1" x 1" galvanized roofing staples
    • Staples spaced every ~1.8" on deck top and nailed every ~5.5" on dock sides
    • One firehose bow sling per slip

    Hinges and Pins

    • All pins shall be 1" in diameter
    • All points are to be welded to conform to American Welding Society standards
    • Hinge sleeves to be minimum schedule 40

    Cleats

    • 5 - cleats per slip
    • All cleats to be lagged to dock frame with 3/8" x 5" zinc plated lags
    *NOTE: These specifications may vary slightly from dock to dock.
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