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ROXUL REPORT:
Fastener Guidelines
TECHNICAL COMMUNICATION
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Fastener
Guidelines
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TECHNICAL COMMUNICATION
DESIGN BASIS
1. MECHANICAL ATTACHMENT
For permanent attachment, ROXUL stone
wool (mineral wool) insulation should be
mechanically attached or pressure held by
supporting members.
2. ADHESIVES
Adhesives and adhesive applied stick-pins
should NOT be used for permanent
attachment of ROXUL stone wool insulation.
Adhesives, and adhesive based systems
can used for temporary attachment, but
mechanical attachment (or supporting
members) must be used for permanent
attachment.
3. EXPOSED INSULATION
ROXUL stone wool insulation is not
intended to be left exposed to the elements.
Cladding should be installed after insulation
attachment. If the insulation is to be left
exposed, or installation takes place in bad
weather, the insulation should be
permanently mechanically attached and
covered with a breathable protective layer
(such as tarp). Designers can increase
number of fasteners to meet specific
conditions and design requirements
(including wind-driven rain-loads).
4. DESIGN LOADS
Fastening connections should be designed
to withstand all the combined applied loads,
including (but not limited to) Dead-Load and
Wind-Loads. Where applicable,
consideration should also be given to
Seismic- Load, Live-Load and Wind-Driven
Rain-Load (Not covered in this guide).
5. DEAD LOAD
Fastening connections should be designed
to withstand all the combined applied dead
loads, including (but not limited to) the
insulation, fasteners and any other
supported members or cladding.
6. WIND LOAD (LIVE LOAD)
Fastening connections should be designed
to withstand horizontal loads imposed by
wind pressures. Wind loads often govern
lateral load scenarios
7. FASTENER SELECTION
Fasteners should be: a) appropriate type for
the substrate; b) capable of withstanding
applied pull-out and shear-loads ; c)
numerous enough and of large enough
cross-section to prevent tear-through of the
insulation under expected conditions; d)
suitable for use outside if being used in
exterior applications.
8. ENGINEERED DESIGN
The design of fastened connections is a task
normally completed, or reviewed, by a
structural engineer. The primary purpose of
this fastener guide is to provide suggestions
for attachment design of ROXUL stone wool
insulation attachment to various structures
and buildings.
9. LIMITATION
ROXUL stone wool insulation boards are
suitable for mechanical attachment using a
number of fasteners and fastening systems.
Mechanically attached fastening systems
are subject to various loads including dead
load, wind load and seismic load; all of
which vary with location and over time.
WARNING: Failure to include safety factors
or adequately design for applied loads can
result in failure of mechanical attachment.
The determination of the specific design
requirements and safety factors regarding a
fastener system is the sole responsibility of
the installer and/or end user. ROXUL Inc
assumes no responsibility whatsoever for
any failure of insulation attachment or
related fastening systems.
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Plain Insulation
1. APPLICATIONS
Exposed Exterior Insulation
Basements (Inside / Outside)
Parking Garages
Acoustic Panels
2. EXPOSED INSULATION
ROXUL stone wool insulation is not
intended to be left exposed to the elements.
Cladding should ideally be installed
immediately after insulation attachment. If
the insulation is to be left exposed, or
installation takes place in bad weather,
ROXUL recommends a minimum of 5
mechanically attached insulation fasteners
per board.
3. TYPE OF FASTENERS
Screw & Washer
Insulation Fastener
Plastic Cap Nails
Impaling Pins
4. NUMBER OF FASTENERS
ROXUL recommends a minimum of 5
mechanically attached insulation fasteners
per board. Designers can increase number
of fasteners to meet specific conditions and
design requirements (including wind-driven
rain-loads).
5. EMBEDDED DEPTH OF FASTENER
Embedded depth required to resist fastener
pull-out will vary with both substrate
material and the fastener type. ROXUL
recommends a minimum 1” embedded
depth, designers may vary this amount.
6. PROPRIETARY FASTENERS
Some proprietary Insulation Fasteners can
provide adequate support with fewer than 5
fasteners per board and less than 1”
embedded depth. Individual fastener
manufacturers should be consulted for
details.
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TECHNICAL COMMUNICATION
5. THERMAL CONTROL LAYER
ROXUL® COMFORTBOARD ™ IS
continuous insulation is the primary thermal
control layer.
The amount of insulation recommended
varies by climate region (see Table 2)
6. VAPOR CONTROL LAYER
The assembly as illustrated is a “vapor
open” assembly, meaning that there is a
single line of vapor control and that drying
can occur towards the interior or towards
the exterior from this line. Selection of
vapor-open interior finishes should be
considered. If vapor impermeable finishes
are used, analysis should be conducted to
assess drying potential.
7. EXTERIOR CLADDING
A drained and back-ventilated wood or fiber
cement siding is illustrated.
Material options for the exterior cladding
include:
• Vinyl siding (see manufacturer’s notes
for installation on furring)
• Wood siding
• Fiber cement siding or panels
8. QUALITY CONTROL
CONSIDERATIONS
Inspect the lapping of drainage plane pieces
to ensure that pieces are installed in
“shingle” fashion.
Ensure a tight fit where the exterior
insulation boards are fit together. At
mechanical and structural penetrations, an
opening in the ROXUL COMFORTBOARD
IS layer may be cut slightly undersized to
ensure a tight fit.
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Strapping
1. GENERAL
Strapping, attached to the building structure,
will act like giant clamps to hold insulation in
place. ROXUL insulation boards will be
permanently mechanically supported by the
strapping attachment if the attachment is
designed to withstand live loads and total
applied dead loads. Insulation boards can
be temporarily held in place prior to
strapping unless the insulation is to be left
exposed without strapping or installation
takes place in bad weather; in which case
guidelines for Plain Insulation attachment in
the previous section should be followed
2. DESIGN
ROXUL recommends installing strapping
vertically to provide a drained cavity;
drained metal hat-channels can be
installed horizontally.
Strapping attachment should be
designed to withstand wind loads and
total applied dead loads (Insulation +
Fasteners + Strapping + Cladding)
ROXUL recommends a maximum
system dead load area weight of 12 psf
for wood frame construction and 5 psf for
metal frame construction.
TECHNICAL COMMUNICATION
3. FASTENERS
Fasteners should be: a) appropriate type
for the substrate; b) capable of
withstanding applied pull-out and shearloads.
Required length, number, spacing and
embedded depth of fasteners will depend
on the type of fastener, the applied loads,
the substrate and the thickness of the
insulation, strapping and any sheathing.
Anti-unwinding fasteners (or alternative
precautions) should be used for metal
frame construction.
Fasteners should be embedded 1.5” in
wood studs and concrete, and extend at
least 3 full threads past the inside face of
steel studs.
Designers can vary the type, number and
embedded depth of fasteners to meet
specific requirements.
4. STRAPPING TYPE
Metal or treated wood strapping can be
used. ROXUL recommends using 2x3 or
2x4 dimensional lumber (laid on the flat), or
metal hat-channels.
5. INSTALLATION TIPS
Use Experienced Installers or a lazer-
level with inexperienced installers
Use 2x3 or 2x4 lumber instead of thinner
strapping
Use double-thread screws for wood
strapping
Recommended for maximum insulation
thickness ≤ 3”
6. REFERENCES
NTA Engineering Evaluation Report
TRU110910-21 can be used to design
strapping attachment for wood-frame
and concrete with TRUFAST SIP and
TRUFAST Tru-Grip fasteners.
ROXUL Continuous Exterior Insulation –
Deflection Report
IMETCO IntelliScreen system is
recommended for cladding installation
using horizontally installed drained
metal hat channels
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Masonry Ties
1. GENERAL
Wedges / clips installed over masonry ties
can be used to attach ROXUL insulation
boards. Non-proprietary or proprietary
masonry ties can be used.
2. DESIGN
Spacing and design of the masonry tie
pattern should follow accepted practice and
be adequate to support wind and dead
loads.
Where permissible by codes and design, the
spacing of ties should be made to be 16” or
24” in at least one orientation (vertical or
horizontal) to allow easy installation of
ROXUL insulation boards with little or no
cutting of the insulation.
3. INSULATION ATTACHMENT
Wedges or clips over masonry ties can be
used to hold the insulation in place at board
edges. Additional fasteners can be used in
the middle of boards if needed.
The average number of masonry tie wedges
and / or fasteners holding a single piece of
insulation should be a minimum of 5.
Designers can increase the number of
fasteners or wedges to meet specific
conditions and design requirements.
4. FASTENERS
ROXUL recommends wedges or clips
designed for the particular type of masonry
tie being used.
If additional fasteners are required in the
middle of boards these can be:
Plastic cap nails
Screws & washers
Insulation Fasteners
Impaling Pins
TECHNICAL COMMUNICATION
5. STPE – ADHESIVE WRB
Some STPE based WRB (Weather
Resistive Barrier) compounds have
adhesive properties prior to curing and can
be used to attach ROXUL stone wool
insulation to the wall when used in
combination with brick ties and wedges
around board edges.
Follow manufacturers direction when using
an STPE based WRB as an adhesive for
ROXUL insulation.
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Clips & Girts
1. GENERAL
Proprietary clips / brackets or nonproprietary stand-offs designed to support
vertically installed z-girts or L-channels can
be used. Insulation is not required to provide
any structural support with this type of
system.
2. THERMAL BRIDGING & Z-GIRTS
ROXUL does NOT recommend using z-girts
through the full thickness of insulation.
Clips, brackets or stand-offs should be used
to minimize thermal bridging.
3. DESIGN
Z-girts and fastening system should be
designed to support wind loads and total
applied dead loads independently of the
insulation.
If clips & girts do NOT provide structural
support to the insulation it should be
fastened per directions for Plain Insulation.
If clips & girts provide structural support to
the insulation then designers can reduce the
required number of fasteners appropriately.
4. CASCADIA CLIPS & OTHER
PROPRIETARY SYSTEMS
Follow manufacturers recommendations
TECHNICAL COMMUNICATION
5. FASTENERS
Fasteners should be appropriate type for
the substrate
Use the manufacturers recommended
fasteners when using proprietary clips &
brackets
Anti-unwinding fasteners (or alternative
precautions) should be used for metal
frame construction and metal-to-metal
fastening of clips & girts.
Fasteners for attaching insulation
Impaling Pins
Screws & Washers
Plastic Cap Nails
Insulation Fasteners
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Fastener -
Examples
TECHNICAL COMMUNICATION
Fastener &
Washer
Recommended for use
will all types of ROXUL
stone wool insulation
boards
Fastener should be
appropriate type for the
substrate
Plastic Cap
Nails
Recommended for
temporarily holding
insulation and fastening
insulation to wood and
wood based substrates
Metal Fasteners
Recommended for use
with metal frame
construction.
Anti-unwinding fasteners
(or other precautions)
should be used with
metal frame construction
Regular
Wood Screws
Concrete Screws
Concrete Nails
Must be right type for
the substrate and
suitable for outside use
if not being used inside.
Clip & Z-Girt
e.g. CASCADIA CLIPS
Recommended for thick
exterior insulation (over
3”)
Follow manufacturers
recommendations for
use
Insulation
Fasteners
e.g. RAMSET
INSULFAST
Recommended for
fastening insulation to
concrete, masonry block
and exterior gypsum
sheathing
Brick-Tie &
Wedge
Wedges or clips used
with masonry ties can be
used to attach ROXUL
CAVITYROCK DD and
MD insulation
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Dual-Thread
Fasteners
e.g. Heco-Topix
Recommended for use
with wood strapping to
reduce risk of
compression deflection
Impaling Pin
Mechanically attached
or bonded to structure.
Recommended for use
with all types of ROXUL
stone wool insulation
boards.
Adhesive “stick” pins
should be avoided
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TECHNICAL COMMUNICATION
DISCLAIMER AND LIMITATION OF
LIABILITY:
The statements and data contained in
this brochure are for general information
purposes ONLY. They are NOT specific
technical recommendations as to any
particular design or application and the
ultimate determination as to product
suitability is the sole responsibility of the
installer or end user. Although the
information contained herein, including
ROXUL product descriptions, is
believed to be correct at the time of
publication, accuracy cannot be
guaranteed and results may vary
depending on the particular design
and/or application.
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ROXUL fully reserves the right to make
product specification changes, without
notice or obligation, and to modify or
discontinue any of its products at any
time. In no event
shall ROXUL be liable for any direct,
indirect, or consequential damages of
any kind arising from information
contained in this bulletin, including, but
not limited to, claims for loss of profits,
business interruption, or damages to
business reputation. This limitation of
liability shall apply to all claims whether
those claims are based in contract, tort,
or any legal cause of action.
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