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DURO-GUARD SECUROCK GYPSUM-FIBER 3/8-INCH ROOF BOARD

Installation: o Duro-Grip CR-20.
 In steel deck applications, Securock Gypsum-  Subsequent layers of insulation and approved
Fiber Roof Board can only be used as a cover cover boards may be attached with insulation
board over insulation or as recover board over adhesive.
an existing roof. It may be placed directly on
flute filler in a metal roof retrofit application Hot Bitumen Attachment
assuming the flutes are completely filled.  When using hot bitumen on concrete decks,
priming is necessary.
 Panels must be kept dry before, during and
after installation. Install only as much insulation  Temperature of the bitumen shall be
as can be covered the same day with approximately 50° F below the inter-ply hand
completed roofing. mopping EVT.
 The use of multiple layers of insulation with  The deck shall be dry and care must be taken
joints staggered a minimum of 6 inches to apply the bitumen in sufficient quantity to
between layers is recommended to eliminate totally cover the available deck surface.
thermal bridging.
 To ensure embedment, the board shall also be
 Abut panel edges loosely (minimum of 1/16- “stepped in” at several points while the bitumen
inch gap on all sides) and stagger joints of is still hot enough to allow positive attachment.
adjacent panels. Gaps may need to be larger
depending on factors like the roof deck's size,  Any roof membrane contaminated with bitumen
membrane color, deck surface temperature and must be replaced.
time of year the roof assembly is installed.
Storage:
 Gaps must be no greater than 1/4 inch around
all penetrations.  Must be protected from open flame and kept
dry at all times.
 Refer to the appropriate Duro-Last roof system
specification and detail drawings for deck  Factory applied packaging is intended only for
preparation and attachment requirements. protection during transit. Slit or remove the
packaging to prevent accumulation of
 Precautions must be taken to ensure that new condensation.
concrete decks have fully hydrated and do not
continue to release moisture.  Store elevated (at least 3 inches) and
completely covered with a weatherproof
Panel Attachment: covering such as a tarpaulin.
 Panels may be attached to the roof deck using  Do not use panels which are wet or damaged.
mechanical fasteners, insulation adhesive or  Refer to PIMA Technical Bulletin No. 109:
hot bitumen. It is acceptable to use these Storage and Handling Recommendations for
products in combination. Polyiso Roof Insulation for additional guidelines

Mechanical Attachment (www.pima.org).
 When installing multiple layers (which may Limitations:
include insulation, cover boards and thermal  Duro-Last, Inc. will not be responsible or liable
barriers) it is acceptable to mechanically secure for any defects or problems related to building
through all layers. or roof design by others, to deficiencies in
 Use fasteners and plates supplied by or construction, to dangerous conditions on the
approved by Duro-Last, Inc. job site, or to improper storage, handling or
installation by others.
Adhesive Attachment
 Insulation adhesive must be supplied by Duro-
Last, Inc. Refer to the adhesive’s Product Data
Sheet for application guidelines. Acceptable
products:
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o Duro-Grip Insta-Stik™.
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o Duro-Grip Olybond500 .
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o Duro-Grip Millenium Weather-Tite .
www.duro-last.com 2 of 2 800-248-0280
Duro-Last, Duro-Guard, Duro-Grip, Duro-Bond and “World’s Best Roof” are registered marks owned by Duro-Last, Inc. Weather-Tite is a registered mark owned by Millenium Adhesive Company.
Securock is a registered mark owned by USG Corporation. RoofNav is a registered mark owned by FM Global. Olybond500 is a registered mark owned by OMG, Inc.
Created: 01/12/2015 Revised: 05/07/2015