um, something like this:
View attachment 29336
or, this:
or, this (with the aforementioned guardrails):
..........................oh, man,
I almost forgot!!!! here's some drywall specs, to help you guys get through this tough off-season:
PART 2 PRODUCTS
2.1 MANUFACTURER:
A. Subject to compliance with requirements, provide products of one of the following:
1. Gypsum Boards and Related Products:
a. U.S. Gypsum Co.
b. National Gypsum Co.
c. Approved equal.
2.1 GYPSUM BOARD:
A. General:
1. Provide gypsum board of types indicated in maximum lengths available to minimize end-to-end joints.
2. Thickness: Provide gypsum board in 5/8" thickness to comply with ASTM C 840 for application system and support spacing indicated.
B. Gypsum Wallboard: ASTM C 36, and as follows:
1. Type: Regular unless otherwise indicated.
2. Edges: Tapered.
C. Gypsum Wallboard for Fire Rated Assemblies: ASTM C 36, and as follows:
1. Type: Type X.
2. Edges: Tapered.
D. Gypsum Board for Multi-Layer Applications: Gypsum wallboard, ASTM C 36, and as follows:
1. Type: Type X
2. Edges: Tapered
E. Moisture-Resistant or Water-Resistant Gypsum Backing Board: ASTM C 630, and as follows:
1. Type: Regular/Type X at Fire Rated Assemblies
2. Edges: Tapered
F. Exterior Gypsum Sheathing: ASTM C 1177 as follows:
1. Type: Regular ("Dens-Glas Gold")/Type X ("Dens-Glas Gold Firestop") for fire rated assemblies.
2. Edges: Manufacturers standard
3. Faces: Alkali-Resistant/Fiberglass Matts front and back.
4. Core: Silicone-Treated Core
2.2 TRIM ACCESSORIES:
A. General: Provide manufacturer's standard trim accessories of types indicated for drywall work, formed of galvanized steel unless otherwise indicated, with either knurled and perforated or expanded flanges for screwing, nailing or stapling, and beaded for concealment of flanges in joint compound. Provide corner beads, L-type edge trim-beads, U-type edge trim-beads, special L-kerf-type edge trim-beads, and one-piece control joint beads at all exposed terminations, corners and other similar conditions.
B. Cornerbead and Edge Trim for Interior Installation: Comply with ASTM C 840 and C1047.
C. Provide other moldings and trim in sizes and configurations as indicated on the drawings.
2.3 JOINT TREATMENT MATERIALS:
A. General: Provide materials complying with ASTM C 475, ASTM C 840, and recommendations of manufacturer of both gypsum board and joint treatment materials for the application indicated.
B. Joint Tape: Paper reinforcing tape.
C. Joint Compound: On interior work provide setting-type for bedding and filling, ready-mixed drying-type all purpose or topping compound for topping.
D. Water-Resistant Joint Compound: On exterior work and work with moisture-resistant and water-resistant gypsum wall board, provide special water-resistant type for treatment of joints, fastener heads and cut edges of moisture-resistant and water-resistant gypsum wallboard.
2.4 MISCELLANEOUS MATERIALS:
A. General: Provide auxiliary materials for gypsum drywall construction which comply with referenced standards and the recommendations of the manufacturer of the gypsum board.
B. Laminating Adhesive: Special adhesive or joint compound recommended for laminating gypsum boards.
C. Spot Grout: ASTM C 475, setting-type joint compound of type recommended for spot grouting hollow metal door frames.
D. Fastening Adhesive: Special adhesive recommended in compliance with ASTM C 557 for laminating gypsum boards to steel framing.
E. Gypsum Board Screws: ASTM C 1002.
F. Concealed Acoustical Sealant: Non-drying, non-hardening, nonskinning, nonstaining, nonbleeding, and gunnable sealant complying with the requirements specified in Section 07901 "Joint Sealants".
G. Primer: Of type recommended by manufacturer for finishing.
PART 3 EXECUTION
3.1 EXAMINATION:
A. Examine substrates to which drywall construction attaches or abuts including but not limited to, insulated or uninsulated metal or wood framing, preset hollow metal frames, cast-in-anchors, and structural framing, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting performance of drywall construction. Do not proceed with installation until unsatisfactory conditions have been corrected.
B. Notify Owner's Representative of unsatisfactory conditions. Do not begin work until deficient substrate areas have been corrected.
C. Proceeding with the work described in this Section implies installer's acceptance of the substrate conditions. Any problems related to the substrate shall be repaired to the satisfaction of the Owner's Representative without any additional cost to the Owner.
3.2 PREPARATION:
A. Furnish necessary materials, clips, anchors and devices to other trades for installation well in advance of time needed for coordination with other construction.
3.3 APPLICATION OF GYPSUM BOARD, GENERAL:
A. Gypsum Board Application and Finishing Standard: Install and finish gypsum board to comply with ASTM C 840 and G.A. 216.
B. Locate exposed end-butt joints as far from center of walls and ceilings as possible, and stagger not less than 24 inches in alternate courses of board.
C. Install ceiling boards across framing in the manner which minimizes the number of end-butt joints, and which avoids end joints in the central area of each ceiling. Stagger end joints at least 24 inches.
D. Install wall/partition boards in manner which minimizes the number of end-butt joints or avoids them entirely where possible. At stairwells and similar high walls, install boards horizontally with end joints staggered over studs.
E. Install exposed gypsum board with face side out. Do not install imperfect, damaged or damp boards. Butt boards together for a light contact at edges and ends with not more than 1/16 inch open space between boards. Do not force into place.
F. Locate either edge or end joints over supports, except in horizontal applications where intermediate supports or gypsum board back-blocking is provided behind end joints. Position boards so that like edges abut, tapered edges against tapered edges and mill-cut or field-cut ends against mill-cut or field-cut ends. Do not place tapered edges against cut edges or ends. Stagger vertical joints over different studs on opposite sides of partitions.
G. Attach gypsum board to supplementary framing and blocking provided for additional support at openings and cutouts.
H. Spot grout hollow steel door frames. Apply spot grout at each jamb anchor clip just before inserting board into frame.
I. Form control joints and expansion joints at location indicated, with space between edges of boards, prepared to receive trim accessories.
J. Isolate perimeter of non-load-bearing drywall partitions at structural abutments. Provide 1/4 inch to ½ inch space and trim edge and seal joints with acoustical sealant, where exposed. Seal with fire sealant at fire rated walls.
K. Space fasteners in gypsum boards in accordance with referenced gypsum board application and finishing standard and manufacturer's recommendations.
3.4 METHODS OF GYPSUM BOARD APPLICATION:
A. Single-Layer Application: Install gypsum wallboard as follows:
1. On ceilings apply gypsum board prior to wall/partition board application to the greatest extent possible.
2. On partitions/walls apply gypsum board vertically (parallel to framing), unless otherwise indicated, and provide sheet lengths which will minimize end joints.
B. Double-Layer Application: Install base and face layer of gypsum wallboard.
1. On ceilings apply gypsum board prior to wall/partition board application to the greatest extent possible.
2. On partitions/walls, apply base layer and face layers vertically (parallel to framing) with joints of base layer over supports and face layer joints offset at least 10 inches with base layer joints.
C. Single-Layer Fastening Methods: Apply gypsum boards to supports as follows:
1. Ceilings and suspended gypsum board locations: Fasten with screws.
2. Walls/Partitions of metal framing construction: Fasten with screws.
D. Double-Layer Fastening Methods: Apply base layer of gypsum board and face layer to base layer as follows:
1. Fasten base layers with screws.
2. Fasten face layer with adhesive and screws.
E. Exterior Gypsum Sheathing: Apply board perpendicular to supports, with end joints staggered over supports. Fasten with screws recommended by the sheathing manufacturer. Install with "gold" side out.
F. Wall Tile Base: Where drywall is base for thin-set ceramic tile and similar rigid applied wall finishes, install Water-Resistant Gypsum Board to comply with the requirements of ASTM C 840 and the manufacturer's recommendations.
G. Special Conditions: At all toilet rooms, at walls behind janitor's sinks, and at other "wet" and "moist" locations, install Water-Resistant Gypsum Board to comply with the requirements of ASTM C 840 and the manufacturer's recommendations.
3.5 INSTALLATION OF DRYWALL TRIM ACCESSORIES:
A. General: Where feasible, use the same fasteners to anchor trim accessory flanges as required to fasten gypsum board to the supports. Otherwise, fasten flanges to comply with manufacturer's recommendations.
B. Install corner beads at external corners.
C. Install metal edge trim whenever edge of gypsum board would otherwise be exposed or semi-exposed, and except where plastic trim is indicated. Provide type with face flange to receive joint compound except where "U" bead (semi-finishing type) is indicated.
1. Install "LC" bead where drywall construction is tightly abutted to other construction and back flange can be attached to framing or supporting substrate.
2. Install "LK" bead where substrate is kerfed to receive long flange of trim.
3. Install "L" bead where edge trim can only be installed after gypsum board is installed.
3.6 FINISHING OF DRYWALL:
A. General:
1. Apply joint treatment at gypsum board joints (both directions); flanges of corner bead, edge trim, and control joints; penetrations; fastener heads, surface defects and elsewhere as required to prepare work for decoration.
2. Prefill open joints and rounded or beveled edges, if any, using setting-type joint compound.
3. Apply joint tape at joints between gypsum boards, except where trim accessories are indicated.
B. Levels of Finishing:
1. Finish interior gypsum wallboard by applying the following joint compounds in prefill and coats indicated for each level of finish. Sand between coats and after last coat:
a) Embedding and First Coat: Setting-Type Joint Compound.
b) Fill (Second) Coat: Setting-type joint compound.
c) Third and Skim (Finish) Coat: Ready-mix drying-type all-purpose or topping compound.
2. Level 1: All joints and interior angles shall have tape embedded in joint compound. Surface shall be free of excess joint compound. Tool marks and ridges are acceptable.
3. Level 2: All joints and interior angles shall have tape embedded in joint compound and one separate coat of joint compound applied over all joints, angles, fastener heads, and accessories. Surface shall be free of excess joint compound. Tool marks and ridges are acceptable.
4. Level 3: All joints and interior angles shall have tape embedded in joint compound and two separate coats of joint compound applied over all joints, angles, fastener heads and accessories. All joint compound shall be smooth and free of tool marks and ridges.
5. Level 4: All joints and interior angles shall have tape embedded in joint compound and three separate coats of joint compound applied over all joints, angles, fastener heads, and accessories. All joint compound shall be smooth and free of tool marks and ridges.
6. Level 5: All joints and interior angles shall have tape embedded in joint compound and three separate coats of joint compound applied over all joints, angles, fastener heads, and accessories. A thin skim coat of joint compound, or a material manufactured especially for this purpose, shall be applied to the entire surface. The surface shall be smooth and free of tool marks and ridges.
C. Finish:
1. Smooth Finish: Provide smooth finish at all interior painted gypsum board where indicated and/or noted. Level 5
2. Textured Finish: Provide light spray textured or knock down finish at all painted gypsum board unless indicated or noted otherwise. Level 4; Submit samples for selection and approval by Owner and Design/Builder prior to installation of gypsum board.
D. Water-Resistant Backing Board Base for Ceramic Tile: Finish joints between water-resistant backing board with tape and setting-type joint compound to comply with gypsum board manufacturer's recommendations and installation standards referenced in Section 09310 "Tile."
E. Partial Finishing: As noted on the drawings, certain areas may receive only partial finish. Areas which are required to achieve or maintain a fire rating must receive the finish required to achieve the assembly rating.
3.7 FIELD QUALITY CONTROL
A. General: Inspect in-place materials and products for compliance with requirements. Repair or remove and replace unacceptable materials and products as directed by Owner's Representative, at no additional cost to the Owner.
B. Acceptance Tolerances:
1. In-place materials will not be acceptable if exceeding the following allowable variations from requirements: Finished framing shall be true planes, level within 1/8-inch in ten feet non-accumulative, when tested with a straightedge in any direction and such surfaces shall be without concave or convex irregularities within the noted 10 feet. Greater deviations will not be acceptable and shall be removed and replaced at no additional cost to the Owner.
2. See Section 09310 "Tile" and Section 09100 “Metal Support Systems” for more restrictive tolerance.
3. Refer to other trades for which in-place materials are substrates. Provide in-place materials to the tolerances required for other trades substrates as specified in other trades sections of these specifications or on the drawings.
C. Substrate: Where in-place materials are substrate for other trade, and in their examination of the substrate and surface, they find unacceptable items or conditions, these items or conditions shall be repaired or replaced at no additional cost to the Owner.
3.8 PROTECTION OF WORK:
A. Provide final protection and maintain conditions, in a manner suitable to Installer, which ensures gypsum drywall work being without damage or deterioration at time of substantial completion.
END OF SECTION
