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LTTR
LTTR Values: ACFoam® CrossVent®
t;nmina1 Th
'With 1.0" Air Space
RS1"
'With 1.0" Mr Space
RSI"
'With 2.0" Air Space
RSI'
Pieces Per Package
Square lest
in 2.5 3.0 3.5 4,0 4.5 5.0 5.5 6.0 6.5
mm 64 76 89 102 114 127 140 152 165
5.6 8.5 14.4 17.4 20.5 23.6
0.99 1.50 2.01 2.54 3.07 3.62 4.17
5.6 8.5 11.4 14.4 17.4 20.5 23.6
D.99 1.50 2.01 2.54 3.07 3.62 4.17
5.6 8.5 11.4 14.4 17.4 20.5 23.6
0.99 1.50 2.01 2.54 3.07 3.62 4.17
18 15 13 11 10 9 8 7 7
576 480 416 352 320 288 256 224 224
`Long-term thermal resistance values (LTTR) of the pofyiso foam were determined in accordance with CANAILC-
6770 and ASTM C 1289, Annex A 1. Alf test samples were third -party selected and tested b y an accredited
materials testing laboratory. The thermal resistance of airspaces does not apply when the airspace in unsealed
and subject to air exchange into and out of the air space, as occurs by design in cross ventilating nail base
insulation with a high percentage of open air space. Therefore, only the LTTR of the ACFoam®-1l is reported. See
ASHRAE Handbook Fundamentals, 23.7 'Factors Affecting Heat Transfer Across Air Spaces."R means resistance
to heal flow. The higher the R -Value, the greater Me insulating power. Compare insulation values before you buy.
To get the marked R -Value, itis essential that this insulation be installed property. The radiant barrier is not a
substitute for code required levels of insulation.
**RSI is the metric expression of LT7R (m2 • IGWj
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