SFG Insulation Application Procedure

APPLICATION RECOMMENDATION

Sheet metal ducts must be clean, dry and tightly seated at all joints and seams prior to installation of duct wrap.
Duct wrap installation shall be cut to "Stretch-Out" dimensions as provided in instructions, and a 50 mm (2") piece of insulation removed from the facing at the end of the piece of insulation to form an overlapping tape flap, as shown below. Failure to provide this flap may result in an unsatisfactory moisture vapor seal at the joint.
Install with facing outside so that the tape flap overlaps insulation and faces at other end. Insulation shall be tightly butted. If ducts are rectangular or square, insulation should not be excessively compressed at duct corners. Seams shall be tacked tape approximately 150 mm (6") on center.
Where rectangular ducts are 610 mm (24") in width or greater, duct wrap shall be secured to the bottom of the sheet metal duct with mechanical fasteners spaced 450 mm (18") on center (maximum).
To ensure the integrity of the facing as a vapor barrier (to prevent condensation from vapor barrier failure), seal all seams, tears, punctures, and other penetrations of the insulation facing with approved tape to provide a vapor tight system.

Selection of insulation thickness and application of insulation are the responsibility of the engineer and the contractor.

STRETCH - OUT DIMENSION

Nominal Thickness	Average Installed Thickness	Round and Oval Ducts	Square Ducts	Rectangular Ducts
1" (25mm)	3/4" (19mm)	P+7" (178mm)	P+6"(152mm)	P+5"(127mm)
1 1/2" (38mm)	1 1/8" (28mm)	P+9 1/2"(241mm)	P+8.0(203mm)	P+7.0(178mm)
2" (50mm)	1 1/2" (38mm)	P+12"(305mm)	P+10"(254mm)	P+8"(203mm)
2.2 (56mm)	1.65 (42mm)	P+13"(330mm)	P+11"(279mm)	P+8 1/2"(279mm)
3" (76mm)	2 1/4" (57mm)	P+17"(432mm)	P+14 1/2"(368mm)	P+11 1/2"(292mm)

Acoustic Board	Steel Decking	Louvers & Lenses	Insulation	Downloadable
Ceiling System	Fastening Tool	Fiber Cements Boards	Gypsum Boards	Wall & Partitions


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