HomeMy WebLinkAboutEvaluation of Interior Condensation Engineer Report 05.03.18o Cd ENGINEERING 'l'129 -24- Road
Grand Junction, CO 815O5Cronk Construction lnc.
Grand Junction (970) 245-0577 . Glenwood Springs/Aspen (970) 640-5029'Montrose/Delta (970) 640-5029
Email: ccigj@msn.com
May 3,2018
TPI Industrial
2471River Road, Unit A
Grand Junction, CO 81505
97 0-243 - 4642 (wk), 97 0 -242-533 0 (fax)
Concerning: evaluation of interior condensation with metal building insulation package for
Raker nroiect located at7677 CR 301. Parachute. CO 81635
The metal building insulation package for the above referenced project has been evaluated with
respect to potential damage from condensation of moisture on the underside of metal roof
sheeting. The "simple Saver" insulation package provided for the project by CMI Metal
Building Insulation has been evaluated with respect to moisture transmission from the interior
conditioned space to the underside of the roof sheeting where it may condense in cold weather
conditions. The insulation package employs an impermeable vapor barrier at the underside of
the roof purlins which will prevent the transmission of humid air into the roof purlin cavity. The
manufacturer states,
"The high strength EnergyCraft fabric liner isolates the cold conductive purlin and girt surfaces
from the inside conditioned air, reducing the exposed conductive purlin and girt surfaces from
about 50% of the roof and wall areas to a fraction of l%o. Water vapor transmission rate is < 0.02
grains per hour/sq. ft. for the standard fabric liner. Factory-made triple extrusion welded seams
are pressure resistant to assure very low vapor penneance and vapor retarder integrity as opposed
to thousands of staple holes or hidden, unsealed lap joints typical with older methods of
insulation."
The evaluation of available literature and performance data concerning the insulation package
indicates condensation issues resulting in damp or moldy conditions on the interior surfaces of
the roof/wall sheeting will not occur. Please call if you have additional questions concerning this
issue. Thank you.
Seal Thomas A. Cronk
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