USG Securock Glass-Mat Sheathing User Manual

Page 2

General

1.1 USG S

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™

glass-mat sheathing meets or exceeds all requirements of ASTM C-1177 Standard

Specification for Glass-Mat Substrate for Use as Sheathing. Panels are available in

" and

thicknesses, 48" wide, and standard lengths of 8', 9' and 10', with square edges. Other sizes are

available on special order.

1.2 This product may be used under exterior claddings where conventional gypsum sheathing products have

traditionally been used, such as brick veneer, clapboard, wood shingles or shakes, plywood, vinyl, metal

and conventional stucco. This product may also be used as a substrate for mechanically and adhesively

attached EIFS.

1.3 Details and requirements pertaining to framing and application limitations shall be controlled by the

cladding, structural or fire-resistant-rated system, and must be approved by the architect, engineer or

design professional of record.

1.4 This product shall be installed in accordance with GA-253 Application of Gypsum Sheathing, ASTM C-1280

Standard Specification for Application of Gypsum Sheathing and the requirements of USG product

literature.

1.5 This product is not approved for use as a nail base.

1.6 Details and requirements pertaining to framing and application limitations shall be controlled by the

cladding, structural or fire-resistant-rated system, and must be approved by the design professional

of record.

1.7 Details for construction for a specific assembly to achieve a required fire resistance shall be installed in

accordance with actual fire resistive testing. Consult the actual UL design for more details.

1.8 Where sound control is required, details of construction shall be in accordance with an acoustical test

report of an assembly that has met the required acoustical value(s).

1.9 Where resistance to racking shear and/or transverse wind load is required, system design capacities

shall be obtained from USG-published literature, engineering evaluations and test reports of a specific

assembly where mandated by local code requirements.

1.10 Always wear appropriate personal protective equipment, such as gloves, safety glasses, hearing protection

and a NIOSH-approved dust mask, when handling and installing glass-mat sheathing panels.

Delivery and Job-Site Storage

2.1 All materials shall be delivered in their original, unopened packages and stored in an enclosed shelter

providing protection from damage and exposure to the elements. WARNING: Store all S

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glass-mat

sheathing panels flat, unless the site manager directs vertical stacking to avoid point overloading of the floor

structure or a tripping hazard. Panels are heavy and can fall over, causing serious injury or death. Do not

move unless authorized.

2.2 Prevent face, back and edges of the panels from exposure to cascading water.

Framing

3.1 S

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glass-mat sheathing shall be installed on either wood or steel framing. The framing system

shall be sized and designed to meet the requirements of the intended application.

3.2 The maximum spacing for framing members is 24" o.c.

3.3 Framing shall be straight and true, attached securely following accepted engineering practices and as

required for the intended design.

3.4 The surfaces to which abutting edges or ends of the sheathing are to be attached shall not be less than

" for steel framing and 1-

" for wood framing.

3.5 Bearing surfaces shall not be less than

" for internal corners or angles.

3.6 Framing members shall be installed so that the surface will be on an even plane, unless otherwise specified,

after the sheathing has been applied. The fastening surface shall not vary more than

" from the plane

of the faces of adjacent framing members.