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DURO-GUARD REWALL HALFBACK ROOF BOARD
Installation:
Hot Bitumen Attachment
 In steel deck applications, refer to Table 1 for
flute spanability.  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
approximately 50° F below the inter-ply hand
as can be covered the same day with
completed roofing. mopping EVT.
 The deck shall be dry and care must be taken
 The use of multiple layers of insulation with to apply the bitumen in sufficient quantity to
joints staggered a minimum of 6 inches
between layers is recommended to eliminate totally cover the available deck surface.
thermal bridging.  To ensure embedment, the board shall also be
“stepped in” at several points while the bitumen
 Abut panel edges loosely (minimum of 1/16-
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  Any roof membrane contaminated with bitumen
depending on factors like roof deck size, must be replaced.
membrane color, deck surface temperature and
time of year the roof assembly is installed. Storage:
 Gaps must be no greater than 1/4 inch around  Must be protected from open flame and kept
all penetrations. dry at all times.

 Refer to the appropriate Duro-Last roof system  Factory-applied packaging is intended only for
specification and detail drawings for deck protection during transit. Slit or remove the
preparation and attachment requirements. packaging to prevent accumulation of
condensation.
 Precautions must be taken to ensure that new
concrete decks have fully hydrated and do not  Store elevated (at least 3 inches) and
continue to release moisture. completely covered with a weatherproof
covering such as a tarpaulin.
Panel Attachment:
 Do not use panels which are wet or
 Panels may be attached to the roof deck using damaged.
mechanical fasteners, insulation adhesive or
hot bitumen. It is acceptable to use these  Refer to PIMA Technical Bulletin No. 109:
products in combination. Storage and Handling Recommendations for
Polyiso Roof Insulation for additional guidelines
Mechanical Attachment (www.pima.org).

 When installing multiple layers (which may
include insulation, cover boards and thermal Limitations:
barriers) it is acceptable to mechanically secure  Duro-Last, Inc. will not be responsible or liable
through all layers. for any defects or problems related to building
 Use fasteners and plates supplied by, or or roof design by others, to deficiencies in
approved by Duro-Last, Inc. construction, to dangerous conditions on the
job site, or to improper storage, handling or
Adhesive Attachment installation by others.
 Insulation adhesive must be supplied by Duro-
Last, Inc. Refer to the adhesive’s Product Data
Sheet for application guidelines. Acceptable
products:
®
o Duro-Grip insulation adhesives
 Subsequent layers of insulation and approved
cover boards may be attached with insulation
adhesive.

www.duro-last.com 2 of 2 800-248-0280

Duro-Last, Duro-Guard and “World’s Best Roof” are registered trademarks owned by Duro-Last, Inc.
ReWall is a registered trademark owned by The ReWall Company, LLC.
Created: 03/18/2017