Roxul ComfortBoard CIS - Manual (Page 4)

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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.
3. FASTENERS
 Fasteners should be: a) appropriate type
for the substrate; b) capable of
withstanding applied pull-out and shear-
loads.
 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
Strapping
ISSUED: 04-15-14 SUPERSEDES 04-11-14