B08_Attach_7_02010_materials.pdf

SECTION 02010 HULL MATERIALS

SAMA-188C 02010-1

1.0 WOOD - DOUGLAS FIR

When the term fir appears in this specification and on the drawings it shall mean Douglas fir.

The primary structural wood used in the hull shall be Douglas fir.

Douglas fir shall be used for the stem, keel, stem post, transverse frames, bulkhead framing, 'tween deck beams, hull planking, bulwark framing and planking, and deck planking. Any minor parts such as cleats and blocking shall be Douglas fir.

All Douglas fir shall have a maximum grain slope of 1:18 and a moisture content less than 12%. Douglas fir shall be free of loose knots, pitch pockets, and sap wood. Douglas fir shall meet AITC visual grading standard L2 for laminated timbers. Douglas fir shall have a density of not greater than 32 lb/cu.ft.

Douglas fir used for deck planking shall be free of knots on the exposed surface. The top layer of deck planking shall be quarter sawn such that the exposed grain is close and vertical for least wear.

Douglas fir used for bulkhead stiffeners shall be clear, straight grain, select structural quality.

2.0 WOOD - OAK

White oak shall be used for certain exposed members in the 'tween deck area for traditional appearance. These members shall include deck beams, clamps, ceiling, spirketing plank, waterway, hatch coamings, hatch gratings, and simulated frames.

White oak shall be structural quality with straight grain, no large knots, no loose knots, at least 90% heartwood. Oak shall be air dried for at least six months with a density not greater than

48 lb/cu.ft.

3.0 WOOD - KNEES & BREASTHOOK

Lodging and hanging knees and breasthook shall be white oak, red oak, or live oak. Knees shall be one piece with naturally grown grain

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conforming to the shape of the knee. Knees shall be air dried for at least six months with a density not greater than

55 lb./cu.ft.

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4.0 PLYWOOD

Plywood shall be used in the hull structure for bulkhead planking, deck planking, and transom planking.

All plywood used as part of the hull structure shall be of fir construction with exterior glue and solid interior plies. Surface plies shall be Grade B or better. Plywood shall meet APA requirements for marine plywood.

5.0 RESORCINOL GLUE

All structural pieces that are laminated under controlled temperature and pressure shop conditions shall be bonded with resorcinol or epoxy glues.

Resorcinol glue shall be a phenol resorcinol resin meeting the requirements of ANSI/AITC A-190.1-1992.

Resorcinol glue shall be used in strict accordance with manufacturer's recommendations.

6.0 EPOXY GLUE

All structural pieces that are laminated under controlled temperature and pressure shop conditions shall be bonded with resorcinol or epoxy glues.

All hull planking, deck planking, transom planking, and all other field joints shall be bonded with epoxy.

Epoxy shall have the following properties:

Potlife (100 g @ 72 degrees Fahrenheit) 21.5 minutes

Specific gravity - cured 1.18

Hardness (Shore D) two weeks 83

Tensile strength 7320 psi

Tensile modulus 4.6 x 10

Flexural strength 11,810

Flexural modulus 4.5 x 10

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The epoxy shall be Gougeon Brothers, Inc., Bay City, MI, West 105/206 or approved equal.

Epoxy glue shall be used in strict accordance with the manufacturer's recommendations.

Any fillers used to increase viscosity or for gap filling shall be as recommended by the epoxy manufacturer.

7.0 BEDDING COMPOUND

Bedding compound, where specified herein and on the drawings, shall be a polyurethane adhesive/sealant designed for use above or below the waterline. It shall become tack free in 48 hours and shall cure in

5-7 days with no shrinkage.

Bedding compound shall have the following characteristics:

Shear strength (fir plywood specimen) 460 psi (7 day cure)

Tensile strength 275 psi

Elongation 350%

Bedding compound shall be 3M, 3M Center, St. Paul, MN, Marine 5200

Adhesive/Sealant or approved equal.

Bedding compound shall generally be black to simulate tar unless otherwise specified. Bedding compound shall be used in strict accordance with the manufacturer's recommendations.

In certain locations bedding has been specified where a part must be removeable and bond strength is not important. In those locations an alternative product shall be used. The alternative product shall be

Sika Corp., Kansas City, MO, Sikaflex 241 or equal.

8.0 SEAM COMPOUND

Deck plank seams on the main and 'tween decks shall be payed with black seam compound installed to simulate poured in tar. The seam compound shall be a two part, pourable, Thiokol LP polysulfide polymer based product designed to resist oil, saltwater, weather, and aging. The

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seam compound shall be BoatLIFE, Inc., Old Bethpage, NY, Life-Calk or approved equal.

Seam compound shall be installed in strict accordance with the manufacturer's recommendations.

9.0 FIBERGLASS SHEATHING

Below the main wale the exterior of the hull shall be sheathed with a fiberglass and epoxy laminate.

The fiberglass shall be layers of 10 oz. E-glass cloth using the widest width material available.

The fiberglass shall be saturated and bonded to the hull with epoxy resin. The epoxy resin shall be identical to the epoxy used for gluing wood as described earlier in this section.

The epoxy resin shall be mixed and installed in strict accordance with the manufacturer's instructions.

10.0 STAINLESS STEEL FASTENERS

Stainless steel bolts, lag bolts, nuts, washers, and screws used in the hull structure shall be of 18-8 alloy. Screws may be of standard wood screw type or may be self-tapping type. In either case proper holes shall be drilled for the pilot and for the shank.

11.0 STAPLES

Staples used to secure layers of planking while the glue sets may be either plastic or brass, of size and type to hold the layer temporarily in place.

12.0 NAILS

Nails used to secure layers of planking while the glue sets may be galvanized steel, stainless steel, bronze or monel.

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13.0 DRIFTS

Drifts shall be used to secure non-structural knees and the breasthook.

Drifts shall be 3/4" diameter mild steel, AISI M1010 or M1020. Rounded heads of 1-1/4" - 1-1/2" diameter shall be forged on the drifts. The drifts shall not be galvanized to show some traditional rust in an interior, non-structural application.

14.0 TRUNNELS

Trunnels, where used to fasten scarfed joints, shall be turned from locust. Trunnels shall be sized for a snug fit in drilled holes and set in epoxy glue.

Simulated trunnels shall be short pieces of locust sized for a snug fit in the holes for the bolts that are being concealed. Simulated trunnels shall be secured with epoxy glue.

15.0 STRUCTURAL STEEL

Structural steel hull components such as deck to frame brackets, 'tween deck beam brackets, and floors on each frame shall be fabricated from

ASTM-A-36 mild steel. Following fabrication (cutting, grinding, welding, drilling, etc.) each piece of steel shall be hot dip galvanized prior to installation.

16.0 DIMENSIONS

All dimensions stated in the specification and on the drawings are the actual dimensions to be installed. A 2"x8" plank is to be actually

2"x8" in size.

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