As you are aware, asphalt-saturated and asphalt-impregnated
felt underlayments are the most common steep-slope roof
underlayments. These types of underlayments are appealing because
of their ease of installation, ability to perform intended
functions and relatively low cost.
Also widely available are synthetic and composite products often
touted by manufacturers as being stronger, lighter or better
weathering alternatives. The following will examine current
standards and building code requirements for underlayments used
Log in or register for FREE access to this article and other Professional Roofing online content.