Roxul ComfortBoard IS - Manual (Page 36)

ROXUL
® The Better Insulation™ 34
04. AIR CONTROL LAYER
a. The drainage plane may be detailed as the primary air control layer if made continuous.
b. Other air barrier system components include the concrete structure, sealant at the rim joist and other framing
connections, and the sill gasket.
c. If an air permeable cavity insulation is selected an airtight drywall approach should be used. An airtight drywall
approach requires all penetrations of the gypsum board to be carefully sealed.
d. Multiple planes of airtightness are recommended where practical to control convection within the enclosure cavity.
05. THERMAL CONTROL LAYER
a. ROXUL COMFORTBOARD IS insulation is the primary thermal control layer.
b. The amount of insulation recommended varies by climate region (see Table 2 )
06. VAPOR CONTROL LAYER
a. 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.
07. EXTERIOR CLADDING
a. A drained and back-ventilated wood or fiber cement siding is illustrated.
b. Material options for the exterior cladding include:
i. Vinyl siding (see manufacturer’s notes for installation on furring)
ii. Wood siding
iii. Fiber cement siding or panels
08. QUALITY CONTROL CONSIDERATIONS
a. Inspect the lapping of drainage plane pieces to ensure that pieces are installed in “shingle” fashion.
b. Ensure a tight fit where the exterior insulation transitions from below- to above-grade wall.
c. Ensure that the finished grade is sloped away from the building.