Vapor Permeable Roof Underlayment

The underlayment continues to act as another layer of protection.

Vapor permeable roof underlayment.

The use of asphalt felts semi permeable products has long been the underlayment of choice. Or just stick with asphalt felt underlayment if you want a vapor permeable product. A highly vapor permeable roofing underlayment air barrier ab material. Roof underlayment test compliance.

Promotes long term drying of roofing assembly through vapor diffusion. Synthetics are manufactured with a vapor permeance that can be as high or higher than asphalt felt underlayment. When all of your old shingles are removed the underlayment is rolled on to protect the exposed roof from elements until the new shingles can be applied. Todays homes are larger and more detailed than in the past making it unlikely the job will be started and completed the same day.

They are also generally more expensive. According to the manufacturer the roofing underlayment features the patent pending vapor permeable polymer composite technology vppct developed by vaproshield. Underlayment works in two waves. Used on steep slope roofs of 2 12 9 46 degrees or greater pitch.

The second period is after the new shingles have been applied. Slopeshield plus self adhered sa a vapor permeable roofing underlayment is designed for use on steep slope roofs of 2 12 or greater pitch. Typically 15 felt for asphalt shingles and 30 for wood roofing were the common practice. Is managed across these two different underlayment systems.