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FIBER ARTS STUDIO RE-BID 06 13 23 TESC PROJECT NO. R14-020 HEAVY TIMBER CONSTRUCTION Page 1 of 6
PART 1 - GENERAL
1.1 SUMMARY
A. Section includes framing using timbers faceted wood poles. B. Related Requirements:
- Section 061000 "Rough Carpentry" for dimension lumber items associated with heavy timber framing.
- Section 061516 "Wood Roof Decking."
- Section 061800 "Glued-Laminated Construction."
- Section 099300 “Staining & Transparent Finishing”
1.2 DEFINITIONS
A. Timbers: Lumber of 5 inches nominal (114 mm actual) or greater in least dimension. B. Log Poles: Faceted members, called either "poles" or "posts" in the referenced standards. C. Inspection agencies, and the abbreviations used to reference them, include the following: D. Coordinate list below with product lists and delete those not referenced. Insert others to suit Project.
- NeLMA: Northeastern Lumber Manufacturers' Association.
- NHLA: National Hardwood Lumber Association.
- NLGA: National Lumber Grades Authority.
- SPIB: Southern Pine Inspection Bureau (The).
- WCLIB: West Coast Lumber Inspection Bureau.
- WWPA: Western Wood Products Association.
- ILBA International Log Builders Association
1.3 ACTION SUBMITTALS
A. Product Data: For preservative-treated wood products and timber connectors.
- For preservative-treated wood products. Include chemical treatment manufacturer's written instructions for handling, storing, installing, and finishing treated material.
- For timber and log pole connectors. Include installation instructions. B. Shop Drawings: For heavy timber framing. Show layout, dimensions of each member, and details of connections. C. Samples: Not less than 12” long, showing the range of variation to be expected in appearance, including surface texture, of wood products. Apply a coat of penetrating sealer to Samples.
1.4 INFORMATIONAL SUBMITTALS
A. Material Certificates:
FIBER ARTS STUDIO RE-BID 06 13 23 TESC PROJECT NO. R14-020 HEAVY TIMBER CONSTRUCTION Page 2 of 6
- For timbers specified to comply with minimum allowable unit stresses. Indicate species and grade selected for each use and design values approved by ALSC's Board of Review.
- For preservative-treated wood products. Indicate type of preservative used and net amount of preservative retained. For products receiving a waterborne treatment, include statement that moisture content of treated materials was reduced to levels specified before shipment to Project site. B. Certificates of Inspection: Issued by lumber-grading agency for exposed timber not marked with grade stamp.
1.5 QUALITY ASSURANCE
A. Manufacturer Qualifications: A qualified with 5 years’ experience in similar projects.
1.6 DELIVERY, STORAGE, AND HANDLING
A. Schedule delivery of materials to avoid extended on-site storage and to avoid delaying the Work. B. Store materials under cover and protected from weather and contact with damp or wet surfaces. Provide for air circulation within and around stacks and under temporary coverings.
PART 2 - PRODUCTS
2.1 WOOD MATERIALS, GENERAL
2.2 TIMBER
A. Comply with DOC PS 20 and with grading rules of lumber-grading agencies certified by ALSC's Board of Review as applicable.
- Factory mark each item of timber with grade stamp of grading agency.
- For exposed timber indicated to receive a stained or natural finish, apply grade stamps to surfaces that are not exposed to view, or omit grade stamps and provide certificates of grade compliance issued by grading agency. B. Timber Species and Grade: Douglas Fir; Select Structural No.1 or No.2, WCLIB as noted on drawings C. Structural Properties: Provide any species and grade that, for moisture content provided, complies with required structural properties.
- Allowable Stress Ratings for 12-Inch Nominal (286-mm Actual) Depth: As indicated on Drawings. D. Moisture Content: Provide timber with 19 percent maximum moisture content at time of dressing.
FIBER ARTS STUDIO RE-BID 06 13 23 TESC PROJECT NO. R14-020 HEAVY TIMBER CONSTRUCTION Page 4 of 6
C. Fabricate strap ties from steel, 3 inches wide by 0.239-inch thick or as shown on drawings. D. Fabricate tie rods from round steel bars with upset threads connected with forged-steel turnbuckles complying with ASTM A 668/A 668M. E. Provide bolts, 3/4 inch (19 mm) unless otherwise indicated, complying with ASTM A 307, Grade A (ASTM F 568M, Property Class 4.6); provide nuts complying with ASTM A 563 (ASTM A 563M); and, where indicated, provide flat washers. F. Provide stainless-steel bolts, 3/4 inch (19 mm) unless otherwise indicated, complying with ASTM F 593, Alloy Group 1 or 2 (ASTM F 738M, Grade A1 or A4); provide nuts complying with ASTM F 594, Alloy Group 1 or 2 (ASTM F 836M, Grade A1 or A4); and, where indicated, provide flat washers. G. Provide shear plates, as shown or 4 inches (102 mm) in diameter, complying with ASTM D 5933. H. Materials: Unless otherwise indicated, fabricate from the following materials:
- Structural-steel shapes, plates, and flat bars complying with ASTM A 36/A 36M.
- Round steel bars complying with ASTM A 575, Grade M 1020.
- Hot-rolled steel sheet complying with ASTM A 1011/A 1011M, Structural Steel, Type SS, Grade 33.
- Stainless-steel plate and flat bars complying with ASTM A 666, Type 304.
- Stainless-steel bars and shapes complying with ASTM A 276, Type 304.
- Stainless-steel sheet complying with ASTM A 666, Type 304. I. Finish steel assemblies and fasteners with rust-inhibitive primer, 2-mil (0.05-mm) dry film thickness. J. Hot-dip galvanize steel assemblies and fasteners after fabrication to comply with ASTM A 123/A 123M or ASTM A 153/A 153M.
2.6 MISCELLANEOUS MATERIALS
A. End Sealer: Manufacturer's standard, transparent, colorless wood sealer that is effective in retarding the transmission of moisture at cross-grain cuts and is compatible with indicated finish. B. Penetrating Sealer: Manufacturer's standard, transparent, penetrating wood sealer that is compatible with indicated finish.
C. Where preservative-treated members are indicated, fabricate (cut, drill, surface, and sand) before treatment to greatest extent possible. Where fabrication must be done after treatment, apply a field-treatment preservative to comply with AWPA M4.
- Use inorganic boron (SBX) treatment for members not in contact with the ground and continuously protected from liquid water.
- Use copper naphthenate treatment for members in contact with the ground or not continuously protected from liquid water. D. Coat crosscuts with end sealer.
FIBER ARTS STUDIO RE-BID 06 13 23 TESC PROJECT NO. R14-020 HEAVY TIMBER CONSTRUCTION Page 5 of 6
E. Seal Coat: After fabricating and surfacing each unit, apply a saturation coat of penetrating sealer on surfaces of each unit except for treated wood where the treatment included a water repellent.
PART 3 - EXECUTION
3.1 INSTALLATION
A. General: Erect heavy timber framing true and plumb. Provide temporary bracing to maintain lines and levels until permanent supporting members are in place.
- Install horizontal and sloping members with crown edge up, and provide not less than 4 inches (102 mm) of bearing on supports. Provide continuous members unless otherwise indicated; tie together over supports with metal strap ties if not continuous.
- Handle and temporarily support heavy timber framing to prevent surface damage, compression, and other effects that might interfere with indicated finish. B. Framing Built into Concrete: Provide 1/2-inch (13-mm) clearance at tops, sides, and ends of members built into masonry, and bevel cut ends 3 inches (76 mm); do not embed more than 4 inches (102 mm) unless otherwise indicated. C. Cutting: Avoid extra cutting after fabrication. Where field fitting is unavoidable, comply with requirements for shop fabrication. D. Fitting: Fit members by cutting and restoring exposed surfaces to match specified surfacing.
- Predrill for fasteners using timber connectors as templates.
- Finish exposed surfaces to remove planing or surfacing marks, and to provide a finish equivalent to that produced by machine sanding with No. 120 grit sandpaper.
- Coat crosscuts with end sealer.
- Where preservative-treated members must be cut during erection, apply a field-treatment preservative to comply with AWPA M4. E. Install timber connectors as indicated.
- Unless otherwise indicated, install bolts with same orientation within each connection and in similar connections.
- Install bolts with orientation as indicated or, if not indicated, as directed by Architect.
3.2 ADJUSTING
A. Repair damaged surfaces and finishes after completing erection. Replace damaged heavy timber framing if repairs are not approved by Architect.
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