Glossary of Roofing and Waterproofing Terms

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Joist: any of the small timbers, metal or wood beams arranged parallel from wall to wall to support a floor, ceiling, or roof of a building.

k-Factor: thermal conductivity for a unit thickness of material. Expressed at Btu~ln/Hr.Ft2~F. R-value is equal to the thickness of the thermal material divided by the k-factor (R=x/k where x = thickness).

Kesternich Test: simulates acid rain conditions by subjecting test specimens to a sulfur dioxide atmosphere as well as condensing moisture for the purpose of evaluating rust/corrosion characteristics.

Knee Cap: a metal cover trim that fits over a panel rib after it has been cut and bent.


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