Roofing underlayment or roofing paper comes in three common types: Asphalt-Saturated Felt (Felt Paper) Rubberized Asphalt Non-Bitumen Synthetics (Synthetic Felt Paper) Roofing underlayment is most commonly called Felt Paper or Ice and Water Shield even though they are different underlayment materials. The underlayment is an often-unseen yet crucial component of today’s residential roofing systems. It is the layer of waterproofing material that protects the roof deck or substrate from water… Continue Reading