Vapor Permeable Roof Underlayment

Promotes long term drying of roofing assembly through vapor diffusion.

Vapor permeable roof underlayment.

The second period is after the new shingles have been applied. Is managed across these two different underlayment systems. Used on steep slope roofs of 2 12 9 46 degrees or greater pitch. Roof underlayment test compliance.

Or just stick with asphalt felt underlayment if you want a vapor permeable product. Slopeshield plus self adhered sa a vapor permeable roofing underlayment is designed for use on steep slope roofs of 2 12 or greater pitch. Synthetics are manufactured with a vapor permeance that can be as high or higher than asphalt felt underlayment. They are also generally more expensive.

Underlayment works in two waves. The underlayment continues to act as another layer of protection. Any material with a perm rating of 10 or greater is highly permeable. Typically 15 felt for asphalt shingles and 30 for wood roofing were the common practice.

The use of asphalt felts semi permeable products has long been the underlayment of choice. 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. According to the manufacturer the roofing underlayment features the patent pending vapor permeable polymer composite technology vppct developed by vaproshield. Todays homes are larger and more detailed than in the past making it unlikely the job will be started and completed the same day.