ADDENDUM NO. 3

Project: Quarry Hill Nature Center – Interior Modifications for Exhibits

Armon Architecture Project No. 2016‐068

Owner: City of Rochester

Issue for Bids: February 6, 2017

Bid due date: March 1, 2017 at 11:00 am

Bids Received By: City Clerk 201 4th Street SE, Room 135 Rochester, MN 55904

Addenda / Date Issued: Addendum No. 1 – 02/22/2017 Addendum No. 2 – 02/24/2017 Addendum No. 3 – 02/27/2017

Acknowledge receipt of this Addendum by inserting its number on the Bid Form. This Addendum forms a part of the Contract Documents.

The Specifications, Contract Documents, and Contract Drawings prepared for this project are hereby modified, amended, or clarified by the following: ITEMS No. Reference Description 1 06 10 00 “Rough FSC Certified wood is not required in this project. Carpentry”

Attachments: 06 10 00 Rough Carpentry

END OF ADDENDUM NO. 3

Page 1 of 1

SECTION 06 10 00

ROUGH CARPENTRY

PART 1 GENERAL

1.01 SUMMARY

A. Provide: 1. Dimension lumber. 2. Boards. 3. Miscellaneous lumber. 4. Engineered wood products: a. Composite wood headers. b. Prefabricated wood I-Joists. 5. Plywood: a. Plywood backing panels. b. Roof sheathing. c. Wall sheathing. d. Subfloor. e. Underlayment. 6. Particle board underlayment. 7. Oriented strand board: a. Subfloor. b. Sheathing. 8. Gypsum sheathing. 9. Fiber board: a. Sheathing. 10. Wood treatment: a. Pressure preservative. b. Fire-retardant. 11. Rough carpentry accessories including, but not limited to: a. Framing anchors and fasteners. b. Sill sealer. c. Air infiltration barrier. d. Building paper.

B. Perform the following: 1. Modify existing carpentry construction for new work.

C. Related Sections: 1. Section 06 17 33- Wood I-Joists 2. Section 06 20 00 - Finish Carpentry 3. Section 06 40 23 - Interior Architectural Woodwork 4. Section 07 21 00 - Thermal Insulation 5. Section 09 22 00 - Non-Structural Metal Framing 6. Section 09 29 00 - Gypsum Board

1.02 REFERENCES

A. ANSI: 1. A194 - Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature 2. A208.1 - Mat-formed Wood Particle Board

B. ASTM: 1. A153 - Zinc Coating, Hot Dip, on Iron and Steel Hardware 2. C585 - Inner and Outer Diameters of Rigid Thermal Insulation for Pipe and Tubing

Rough Carpentry ARMON 140034 06 10 00 - 1 3. C1177 - Glass Mat Gypsum Substrate Sheathing 4. C1396 - Gypsum Board 5. D226 - Asphalt Saturated Organic Felt Used in Roofing and Waterproofing 6. E84 - Surface Burning Characteristics 7. E96 - Test for Water Vapor Transmission 8. E1677 - Air Retarder Material or System for Low Rise Framed Building Walls

C. AWPA U1 - Preservative Treatment by Pressure Process

D. Engineered Wood Association (APA): 1. E30 - Design/Construction Guide - Residential and Commercial 2. E445 - Performance Standard and Policies for Structural-use Panels

E. Military Specification MIL-L-19140E - Lumber and Plywood, Fire Retardant Treated

F. NFPA: 1. Recommended Nailing Schedule 2. Manual for Wood Frame Construction 3. National Design Specifications for Wood Construction 4. Surface Burning Characteristics of Building Materials

G. UL 723 - Surface Burning Characteristics of Building Materials

H. U.S. Department of Commerce (DOC) National Institute of Standards and Technology: 1. PS 1 - U.S. Product Standard for Construction and Industrial Plywood 2. PS 20 - American Softwood Lumber Standard

1.03 DEFINITIONS

A. FRT: Fire-retardant treated wood

B. Mil Spec: Military Specification

C. NDS: National Design Specifications

D. PT: Pressure treated

1.04 INSPECTION AGENCIES

A. NLGA: National Lumber Grades Authority

B. SPIB: Southern Pine Inspection Bureau

C. WCLIB: West Coast Lumber Inspection Bureau

D. WWPA: Western Wood Products Association

1.05 SUBMITTALS

A. Product Data: 1. For construction adhesive, including printed statement of VOC content. 2. For each composite wood product used indicating that bonding agent used contains no urea formaldehyde. 3. Wood Treatment Data: Chemical treatment manufacturer’s instructions for handling, storing, installation, finishing.

Rough Carpentry 06 10 00 - 2 ARMON 140034 B. Certificates: 1. Preservative Treatment: Treatment plant certification stating type of preservative solution and pressure process used, net amount of preservative retained, conformance with applicable standards. 2. Waterborne Treatment: Statement that moisture content was reduced to levels indicated prior to shipment to Site. 3. Fire-Retardant Treatment: Treatment plant certification that treatment material complies with specified standards and other requirements. 4. For wood members treated with FRT chemicals, NDS for Wood Construction Section 2.3.4 requires submittal of design values, including connections, from the company providing the treatment and redrying service. 5. Submit organic chemical formulation, third party inspected, ICBO and NER report, EPA registered as a preservative, with a builder’s warranty.

C. Wood Treatment Data: Chemical treatment manufacturer’s instructions for handling, storing, installation, finishing.

1.06 QUALITY ASSURANCE

A. Corrosion of steel is an issue when in contact with preservative-treated wood at high moisture content levels. For FRT wood, the company providing the treatment should be contacted.

B. Research/Evaluation Reports: Show compliance of following with building code in effect for Project: 1. Preservative-treated wood. 2. Fire-retardant-treated wood. 3. Engineered wood products. 4. Foam-plastic sheathing. 5. Power-driven fasteners. 6. Powder-actuated fasteners. 7. Expansion anchors. 8. Metal framing anchors. 9. Air infiltration barrier building wrap.

1.07 DELIVERY, STORAGE, AND HANDLING

A. Storage: 1. Keep covered, dry. 2. Protect against exposure to weather, contact with damp or wet surfaces. 3. Stack lumber, plywood, and other panels; provide for air circulation within and around stacks, under temporary coverings including polyethylene and similar material. 4. For lumber and plywood pressure treated with waterborne chemicals, sticker between each course to provide air circulation.

1.08 PROJECT CONDITIONS

A. Drawings do not purport to show actual field dimensions, but are intended only to establish location and scope of Work. Field-verify dimensions and assume full responsibility for their accuracy.

PART 2 PRODUCTS

2.01 MANUFACTURERS

A. Gypsum Sheathing: Subject to compliance with specified requirements, acceptable manufacturers and products are: 1. Domtar Gypsum 2. Georgia-Pacific, Atlanta, GA 3. National Gypsum Company; Gold Bond Building Products Division 4. United States Gypsum, Chicago, IL

Rough Carpentry ARMON 140034 06 10 00 - 3 5. Manufacturer of comparable products submitted in compliance with Section 01 25 13.

B. Glass Fibered Surfaced Gypsum Sheathing: Subject to compliance with specified requirements, acceptable manufacturers and products are: 1. Georgia-Pacific, Atlanta, GA 2. United States Gypsum, Chicago, IL 3. Manufacturer of comparable products submitted in compliance with Section 01 25 13.

C. Fiberboard Underlayment: Subject to compliance with specified requirements, acceptable manufacturers and products are: 1. Flakeboard www.blakeboard.com 2. SoundStop by Celotex www.knightcelotex.com 3. Manufacturer of comparable products submitted in compliance with Section 01 25 13.

D. Recycled Fiber Particleboard: Subject to compliance with specified requirements, acceptable manufacturers and products are: 1. Encore by SierraPine www.sierrapine.com 2. Manufacturer of comparable products submitted in compliance with Section 01 25 13.

E. Air Infiltration Barrier Building Wrap: Subject to compliance with specified requirements, acceptable manufacturers and products are: 1. DuPont Company; Fibers Department, Wilmington, DE 2. Raven Industries, Inc., Sioux Falls, SD 3. WrapShield by VaproShield, Gig Harbor, WA www.vaproshield.com 4. Manufacturer of comparable products submitted in compliance with Section 01 25 13.

F. FSC Certified Wood Products: Subject to compliance with specified requirements, acceptable manufacturers and products are: 1. Certified Wood Products, Minnetonka and Maple Lake, MN www.certifiedwoodproducts.net 2. Aitkin Hardwoods, Aitkin, MN www.aitkinhardwoods.com 3. Other Minnesota providers: Upper Mississippi Certified Group (UMCG) 4. Other states: www.fscus.org/certified_companies 5. Manufacturer of comparable products submitted in compliance with Section 01 25 13.

2.02 MATERIALS

A. Lumber, General: 1. Lumber Standards: Manufacture lumber to comply with DOC PS 20, applicable grading rules of referenced inspection agencies certified by ALSC Board of Review. 2. Grade Stamps: Factory-mark each piece with grade stamp of inspection agency evidencing compliance with grading rule requirements, grading agency, grade, species, moisture content at time of surfacing, and mill. 3. Nominal Sizes: a. As indicated, except as shown by detail dimensions. b. Actual sizes required by PS 20, moisture content specified for each use. c. Dressed lumber, S4S, unless otherwise indicated. d. Seasoned lumber with 19 percent maximum moisture content at time of dressing and shipment for sizes 2 inches or less nominal thickness, unless otherwise indicated.

B. Dimension Lumber: 1. Structural Framing: Spruce-Pine-Fir, No. 2 or as noted on Drawings; 2 inches to 4 inches thick, 2 inches or wider. 2. Stud Framing: “Stud” grade lumber, Spruce-Pine-Fir, 2 inches to 4 inches thick, 2 inches to 6 inches wide, 10 feet and shorter. 3. Other Light Framing: “Construction” grade lumber, 2 inches to 4 inches thick, 2 inches or wider, any suitable species.

Rough Carpentry 06 10 00 - 4 ARMON 140034 C. Boards: 1. Exposed: a. Where exposed in finished work: Moisture content 19 percent maximum, “S-DRY.” b. Where painted finish indicated: Southern Pine, No. 2 boards per SPIB, or Douglas Fir Construction boards per WCLIB or WWPA. 2. Sizes: As indicated or, if not indicated, 1-inch by 8-inch boards.

D. Miscellaneous Lumber: Wood for support or attachment of other work, of sizes indicated, worked into shapes shown, and as follows: 1. Moisture content: 19 percent maximum for lumber items not specified to receive wood preservative treatment. 2. Grade: a. Standard grade light framing size lumber, any species or board size lumber as required. b. No. 3 Common or Standard grade boards per WCLIB or WWPA rules or No. 3 boards per SPIB rules.

E. Plywood Panels: 1. Comply with PS 1. For products not manufactured under PS 1 provisions, comply with APA E445. 2. Trademark: Factory-mark each panel with APA trademark evidencing compliance with grade requirements. 3. Provide exterior grade plywood at all locations unless specified otherwise. 4. Concealed APA Performance-Rated Panels: Comply with requirements indicated for grade designation, span rating, exposure durability classification, edge detail where applicable, thickness. 5. Type of Use: a. Sheathing: 1) Grade: APA C-D, exterior glue. 2) Pressure preservative treated for roof parapet, curbs, etc. 3) Thickness as indicated but at least 5/8 inch. 4) Size: 4 feet by 8 feet. b. Underlayment: 1) Grade: APA UL, plugged with exterior glue. 2) Thickness as indicated but minimum 3/4 inch. 3) Size: 4 feet by 8 feet wherever possible. 4) Configuration: Tongue and groove. c. Plywood backing panels: 1) Mounting electrical or telephone equipment: Fire-retardant treated plywood panels with grade designation, APA C-D PLUGGED INT with exterior glue, thickness indicated, or, if not otherwise indicated, not less than 1/2 inch nominal. 2) Grab bar mounting: a) APA C-D exterior glue. b) Thickness as indicated, 5/8-inch minimum.

F. Particleboard: Manufacture and factory-mark each particleboard panel to comply with ANSI A 208.1 for grade indicated.

G. Recycled Fiber Particleboard: 1. Meet ANSI A208, M3 rating. 2. Phenolic binder. 3. From FSC certified sustainable forestry operation. 4. Complying with CARB Phase II regulations. 5. Environmentally Preferable Product (EPP) certified.

H. Oriented Strand Board: 2-M-W (wafer board) in thickness, for application indicated; span rating required to suit spacing.

Rough Carpentry ARMON 140034 06 10 00 - 5 I. Gypsum Sheathing or Underlayment: 1. Gypsum Sheathing: a. Standards: Comply with FS SS-L-30 for type II (sheathing), Class 2 (water-resistant surfaces), form (plain back), grade (core), and style indicated below; and ASTM C1396. b. Grade W: Water-resistant treated core. c. Style: Square edges and ends. d. Thickness: As indicated or, if not indicated, 1/2-inch minimum. e. Size: 4 feet by 8 feet or 9 feet as required for coordination with framing. 2. Gypsum Board Floor Underlayment: a. ASTM C585, in maximum lengths available to minimize end-to-end joints. b. Type X for floor underlayment. c. Square all sides. d. 5/8-inch-thick.

J. Fiberboard Sheathing: 1. ANSI/AHA A194.1, Type IV cellulosic fiberboard sheathing, Class 1 (regular density) with square edges. 2. Size: a. 1/2 inch thick by 4 feet wide by 8 or 9 feet long.

K. Miscellaneous Materials: 1. Fasteners, Anchorages: a. Size, type, material, finish indicated and recommended by applicable standards, Federal Specifications, and manufacturer for each use, including recommended nails. b. Where rough carpentry work exposed to weather, in ground contact, or in area of high relative humidity, provide fasteners, anchorages with hot-dip zinc coating (ASTM A153). 2. Building Paper: a. ASTM D226, Type I. b. Asphalt-saturated felt, non-perforated, 15-pound type. 3. Air Infiltration Barrier Building Wrap: a. Comply with ASTM E1677, Type 1. b. Polyolefins: Either cross-laminated films, woven strands, or spunbonded fibers; coated or uncoated; with or without perforations to transmit water vapor but not liquid. c. Minimum thickness: 3 mils. d. Minimum water vapor transmission: 10 Perms when tested according to ASTM E96, Procedure A. e. Maximum flame spread: 25 per ASTM E84. f. Allowable exposure time: 3 months minimum. 4. Sill Sealer: Glass fiber wool blanket, 1/2-inch-thick by width of plates. 5. Plywood Sheathing Clips: Simpson PSC. 6. Adhesives for field gluing panels to framing: Formulation complying with APA AFG-01 or ASTM D3498 that is approved for use with type of construction panel indicated by both adhesive and panel manufacturers, with VOC content not more than 70 g/L.

L. Wood Treatment by Pressure Process: 1. Preservative treatment for wood indicated as PT or specified to be treated: a. Mark each treated item with AWPA Quality Mark requirements. b. Complete fabrication of treated items prior to treatment whenever possible. c. It cut after treatment, coat cut surfaces with heavy brush coat of same chemical used for treatment. d. Inspect each piece after drying, discard damaged or defective pieces. e. For above ground items, kiln-dry to maximum moisture content of 19 percent or that allowed by National Grading Rules for the species and size specified to be dried. f. Comply with the following AWPA U1 standards: 1) UC3A: Exterior, above ground, coated and rapid water runoff, such as coated millwork, siding, and trim. 2) UC3B: Exterior, above ground, uncoated or poor water runoff such as decking, railings, fence posts, uncoated millwork.

Rough Carpentry 06 10 00 - 6 ARMON 140034 3) UC4A: Ground contact or fresh water such as fence, deck, guardrail and utility posts (low decay areas). 4) UC4B: Ground contact or fresh water, difficult replacement (high decay areas). 5) UC4C: Ground contact or fresh water, critical structural components such as foundation piling (severe decay areas). 2. Fire-Retardant Treatment: a. Where FRT (FRTW) is indicated, pressure impregnate with fire-retardant chemicals to comply with AWPA Replace with UCFA (interior, not in contact with ground) and UCFB (exterior, not in contact with ground or foundations). 1) Chemical shall provide protection against termites and fungal decay. 2) Chemical shall be free of halogens, sulfates, and ammonium phosphate. b. Identify with appropriate classification marking of Underwriters Laboratories, Inc., U.S. Testing, Timber Products Inspection or other testing and inspecting agency acceptable to authorities having jurisdiction. c. Interior Type B: Use wherever wood is indicated for interior applications. d. Inspect each piece of plywood after drying; discard damaged or defective pieces. e. All FRT wood to be in contact with steel shall be non-corrosive. 1) Contact company providing FRT treatment. 2) FRT in contact with carbon steel, galvanized steel, aluminum, copper and red brass shall exhibit corrosion rates less than 1 mil per year when tested in accordance with Fed. Spec. MIL-L-19140. f. Product: Dricon Fire Retardant Treated Wood, Smyrna, GA, or approved equal. 3. Use chemicals acceptable to authorities having jurisdiction and containing no chromium or arsenic.

PART 3 EXECUTION

3.01 EXAMINATION

A. Work of Other Trades: Prior to commencing work, carefully inspect and verify that work is complete to point where this installation may properly commence.

B. Verification of Conditions: Verify that rough carpentry may be installed in accordance with original design, pertinent codes and regulations, and pertinent portions of referenced standards.

C. Discrepancies: 1. Immediately notify Engineer. 2. Do not proceed with installation in areas of discrepancy until fully resolved. 3. Commencement of installation signifies acceptance of surface conditions.

3.02 INSTALLATION, GENERAL

A. Coordinate and fit carpentry work to other Work. 1. Scribe, cope as required for accurate fit. 2. Correlate location of furring, nailers, blocking, grounds, and similar supports to allow attachment of other Work.

B. Set carpentry work to required levels and lines, with members plumb and true to line, cut, and fitted.

C. Defective Units: Discard if defects might impair quality of work, or if units are too small to use in fabricating work with minimum joints or optimum joint arrangement.

D. Fastening: 1. Securely attach carpentry work to substrate by anchoring and fastening as shown and as required by recognized standards. 2. Countersink nail heads on exposed carpentry work, fill holes. 3. Make tight connections between members. 4. Install fasteners without splitting of wood, pre-drill as required.

Rough Carpentry ARMON 140034 06 10 00 - 7

3.03 WOOD GROUNDS, NAILERS, BLOCKING, SLEEPERS

A. Provide where shown and where required for screeding or attachment of other work.

B. Form to shapes shown and cut as required for true line and level of work to be attached.

C. Coordinate location with other work involved.

D. Attach to Substrates: 1. As required to support applied loading. 2. Countersink bolts, nuts flush with surfaces, unless otherwise indicated. 3. Build into masonry during installation of masonry work. 4. Where possible, anchor to formwork before concrete placement.

E. Grounds: 1. Permanent, of dressed, preservative treated, key-beveled lumber. 2. Not less than 1-1/2 inches wide. 3. Thickness required to bring face of ground to exact thickness of finish material involved. 4. Remove temporary grounds when no longer required.

F. Blocking: 1. Provide 2 by 8 wood blocking behind wall-mounted fixtures. 2. Window treatment blocking shall extend 8 inches minimum beyond window opening. 3. Where wood-preservative-treated lumber is installed adjacent to metal decking, install continuous flexible flashing separator between wood and metal decking.

G. Fire-Treated Wood: Provide for interior blocking, nailers, furring, etc.

3.04 WOOD FURRING

A. Installation: 1. Plumb, level with closure strips at edges and openings. 2. Shim with wood as required for tolerance of finished work. 3. Provide fire treated wood for all furring. 4. Firestop furred spaces on walls at each floor level and at ceiling line of top story, with wood blocking or noncombustible materials, accurately fitted to close furred spaces.

3.05 WOOD FRAMING, GENERAL

A. Framing Members: 1. Sizes, on spacings shown, frame openings as shown, or if not shown, comply with recommendations of NFPA “Manual for Wood Frame Construction.” 2. Do not splice structural members between supports. 3. Provide fire-treated wood for wood framing.

B. Anchor and nail as shown, and to comply with “Recommended Nailing Schedule” of “Manual for Wood Frame Construction” and “National Design Specifications for Wood Construction” published by NFPA.

C. Firestop concealed spaces of wood framed walls and partitions at each floor level and at the ceiling line of the top story. Where firestops are not automatically provided by the framing system used, use closely fitted wood blocks of nominal 2-inch-thick lumber of the same width as framing members.

D. Install sill sealer under sills and where exterior wood framing abuts masonry or concrete.

3.06 STUD FRAMING

A. Unless otherwise shown, use 2 by 4 or 2 by 6 wood studs spaced 16 inches on center with wide face perpendicular to direction of wall or partition.

Rough Carpentry 06 10 00 - 8 ARMON 140034

B. Provide single bottom plate and double-top plates 2 inches thick by width of studs. Nail or anchor plates to supporting construction.

C. Studs shall be doubled (1 stud and 1 trimmer at all door and window openings) to provide 1-1/2 inch lintel bearing at each end for full width of lintel, unless noted otherwise.

D. Construct corners and intersections with not less than 3 studs. 1. Provide miscellaneous blocking and framing as shown and as required for support of facing materials, fixtures, specialty items and trim. 2. Brace all corners with 20-gage metal strap bracing.

3.07 FLOOR JOISTS FRAMING

A. Provide framing of sizes and spacings shown. 1. Install with crown edge up and support ends of each member with not less than 1-1/2 inch of bearing on wood or metal, or 3 inches on masonry. 2. Attach to wood bearing members by toe nailing or metal connectors; frame to wood supporting members with wood ledgers as shown, or if not shown, with metal connectors. 3. Frame openings with headers and trimmers supported by metal joist hangers; double headers and trimmers where span of header exceeds 4 feet.

B. Lap member framing from opposite sides of beams, girders or partitions not less than 4 inches or securely tie opposing members together. Provide solid blocking (2 inches thick by depth of joist) over supports.

C. Under jamb studs at openings, provide solid blocking between joists.

3.08 INSTALLATION OF CONSTRUCTION PANELS

A. Plywood Installation: 1. Comply with applicable recommendations contained in Form No. E30, “APA Plywood Design/ Construction Guide,” Residential and Commercial,” for types of plywood products and applications indicated. Comply with “CodePlus” provisions of above referenced guide. 2. Fastening Methods: a. Subfloor/underlayment combination: 1) Nail to framing. 2) Space panels 1/8 inch at edges and ends. 3) Fill and sand edge joints of underlayment receiving resilient flooring just before installing flooring. b. Subfloor: 1) Nail to framing. 2) Space panels 1/8 inch at edges and ends. c. Sheathing: Nail to framing. d. Underlayment: 1) Nail to subflooring. 2) Space panels 1/32 inch at edges and ends. 3) Fill and sand edge joints of underlayment receiving resilient flooring just before installing flooring. e. Plywood backing panels: Nail or screw to supports.

B. Oriented Strand Board (OSB) Installation: 1. Allow 1/16 inch spacing at panel ends and 1/8 inch at panel edges, unless noted otherwise by manufacturer. 2. Nails: Cement coated box nails, unless otherwise noted. 3. Stapling of oriented Strand board not permitted. 4. Wall Sheathing: a. Place vertically with joints over studs, plates or 2-inch blocking. b. Protect panels against damage until roofing is installed.

Rough Carpentry ARMON 140034 06 10 00 - 9 c. Attach to CMU with Tap Con screws, or equal. d. Stagger end joints and allow 1/8-inch space. End joints shall occur on supports. Space panel edges 1/8 inch. e. Nail 6 inches on center along panel edges and 12 inches on center at intermediate supports. f. Use 8d coated box nails.

3.09 GYPSUM WALL SHEATHING

A. Screw-attach to exterior of each stud with 1 inch, Type S-12, cadmium-plated screws, spaced 3/8 inch from ends and edges, approximately 8 inches on center. Break at control joints.

B. Horizontally Installed Sheathing: 1. Center end joints over supports, stagger in each course. 2. Fasten to each support in accordance with manufacturer’s recommended spacing, but at least 4 fasteners per 2 feet width per stud if framing is diagonally braced, or at least 7 fasteners per 2 feet width per stud if not braced.

C. Vertically Installed Sheathing: 1. Center long edges over studs. 2. Provide solid blocking wherever end joints do not bear against framing sills or plates. 3. Fasten to each support in accordance with manufacturers recommended spacing, but not more than 4 inches on center around perimeter at edge and end supports and 8 inches on center at intermediate supports.

3.10 FIBERBOARD SHEATHING

A. Install fiberboard wall sheathing where shown on Drawings. 1. Fasten each unit to intermediate supports and then at edges and ends. 2. Drive fasteners flush with surface of sheathing and locate perimeter fasteners at least 3/8-inch from edges and ends. 3. Fasteners: a. For 1/2-inch sheathing, use 11 gage galvanized roofing nails with 7/16-inch or 3/8-inch heads and a minimum length of 1-1/2 inches, or 6d common nails. b. Comply with manufacturer’s recommended spacing and referenced nailing schedule. c. Minimally space fasteners not more than 3 inches on center around perimeter at edge and end supports and 6 inches on center at intermediate supports. 4. Install 4 foot by 8 foot or longer sheathing vertically with long edges parallel to, and centered over, studs. 5. Install solid wood blocking where end joints do not bear against framing sills or plates. 6. Allow 1/8-inch open space between edges and ends of adjacent units. 7. Stagger horizontal joints, if any.

3.11 AIR INFILTRATION BARRIER

A. Cover sheathing with air infiltration barrier as follows: 1. Apply as soon as practical after installation to prevent deterioration from wetting. 2. Apply plastic sheet to comply with manufacturer’s written directions. 3. Apply air infiltration barrier to cover upstanding flashing with 4-inch overlap.

3.12 ASPHALT FELT

A. Install over gypsum sheathing or other substrates horizontally with upper courses lapping over lower by 2-inch minimum.

B. Lap end joints minimum 6 inches, stagger minimum 4 feet from course-to-course.

C. Fasten securely with corrosion resistant staples.

D. Leave bottom of felt loose to allow lapping over wall flashings where it occurs.

Rough Carpentry 06 10 00 - 10 ARMON 140034

E. After flashing installed, securely anchor felt in place.

3.13 SCHEDULES

A. Nailing Schedule: Comply with “Nailing Schedule” in International Building Code 2304.9, unless more stringent requirements are specified.

B. Pressure Treated Wood Preservative: Where indicated on Drawings or if not indicated, including but not limited to: 1. Sill plates in contact with concrete or masonry. 2. Roof blocking and framing used for built-up roofing and single membrane roofing.

3.14 CLEANING

A. Do not allow accumulation of scraps and debris. Maintain premises in neat, orderly condition at all times.

END OF SECTION

Rough Carpentry ARMON 140034 06 10 00 - 11