Specifications - Lord and Son Construction, Inc.

2. Control Joints:
a. Install control joints at locations indicated, or if not indicated, at spacings
and locations required by “GA-216, Application and Finishing of Gypsum
Panel Products”, and as specified herein. Locations shall be approved by
Contracting Officer prior to installation for visual effect.
3.4 LEVELS OF GYPSUM BOARD FINISH
(1) Install control joints at junction of gypsum board partitions with walls
or partitions of other finish material.
(2) A control joint shall be installed where a partition, wall, or ceiling
traverses a construction joint (expansion, seismic, or building control
element) in the base building structure.
(3) Control joints shall be installed where a wall or partition runs in an
uninterrupted straight plane exceeding 30 linear feet.
(4) Control joints in interior ceilings shall be installed so that linear
dimensions between control joints do not exceed 30 linear feet.
(5) Where gypsum board is vertically continuous, as at stairwells,
provide horizontal control joints at each floor level.
(6) A control joint or intermediate blocking shall be installed where
ceiling framing members change direction.
(7) Where a control joint occurs in an acoustical system, blocking shall
be provided behind the control joint by using a backing material of 5/8
in. type X Mold and Mildew resistant gypsum board as specified
herein, mineral fiber, or other tested equivalent.
A. Levels of Finish: Provide in accordance with Gypsum Association “GA 214,
Recommended Levels of Gypsum Board Finish”.
1. Level 1: Ceiling plenum areas, exterior, and concealed areas, except provide
higher level of finish as required to comply with acoustical ratings.
a. All joints and interior angles shall have tape set in joint compound.
Surface shall be free of excess joint compound. Tool marks and ridges
are acceptable.
2. Level 2: all Tile Backer gypsum surfaces to receive tile.
a. All joints and interior angles shall have tape embedded in joint compound
and wiped with a joint knife leaving a thin coating of joint compound over
all joints and interior angles. Fastener heads and accessories shall be
covered with a coat of joint compound. Surface shall be free of excess
joint compound. Tool marks and ridges are acceptable. Joint compound
applied over the body of the tape at the time of tape embedment shall be
considered a separate coat of joint compound and shall satisfy the
MAHG121038 09 29 00 - 7 GYPSUM BOARD