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Transcript of Fenestration Condensation
Product Selection Considerations
Glass Position: flush outside, center, interior. May not have separate testing.
Pour & debridge vs thermal struts.
Fiberglass pressure plates for curtain wall.
Edge spacer options for insulating glass units.
Extended mullion caps may act as heat sinks and are probably not tested to see how they affect thermal performance criteria.
Orientation with regard to sunlight.
Position of fenestration: flush with wall or recessed?
Anchorage to uninsulated elements.
Alignment of thermal barrier with fenestration thermal breaks, which may be different for curtain wall, storefront, and windows.
Exposure to drainage cavity in wall.
Sills or panning that act as thermal bridges.
Air infiltration. Neither AAMA nor NFRC take air infiltration into account for condensation resistance.
Uninsulated shim spaces.
Uninsulated corner trim.
Location of exterior sealant bead.
Interior design humidity.
The best laid plans ...
Closed drapes or shades.
Temperatures lower than design criteria.
Exterior wind velocity.
Sealant discontinuity or failure that lets cold air into shim space.
Average values for entire assembly
U-Value, SHGC, Air leakage
Component & detail specific
Short circuits have great impact
COG - Center of Glass
EOG - Edge of Glass
size & configuration matter!
36 x 48
24 x 36
24 x 48
Limit air leakage
Reduce air exchanges
Improve fenestration performance
Optimal interior 30% RH
requires high performance
Available Test Standards
Voluntary Test Method for Thermal Transmittance and Condensation Resistance of Windows, Doors and Glazed Wall Sections
Procedure for Determining Fenestration Product Condensation Resistance Values
Physical test with thermocouple surface temperature measurements
Condensation Resistance Factor - dimensionless Scale 30 - 80
Weighted value for entire assembly
Condensation Resistance - dimensionless Scale 1 - 100
Lowest of Frame, COG, and EOG values
Computer simulation at 30, 50, & 70 % RH with physical test verification
Test Conditions - both tests use the same
Outdoor: 0 deg F, 15 mph wind
Indoor: 70 deg F
AAMA Condensation Resistance Factor Tool
dew point temperature
outdoor design temp
indoor design temp
Energy Star requires NFRC U-value & SHGC
NFRC labeling requires
Visible light transimittance
NFRC Optional Reporting
What makes the difference?
Framing thermal breaks and glass position
Control air leakage
Heel bead sealants?
Gap and crack foam sealant?
Optimize glass performance
Edge spacer material
stronger - thinner wall
Butyl rubber; Swiggle Seal by Tru-Seal Technologies
Tin plated or stainless steel: Intercept by GED Integrated Solutions
Stainless steel dual seal: XL Edge by Cardinal Glass Industries
Composite Laminate: DuraSeal by Quanex Building Products
Silicone foam: Super Spacer by Quanex Building Products sealed with butyl
Polymer and stainless steel: TGI-Spacer by Technoform Glass Insulation