Roofing Over Wet Underlayment

Roofing in the rain.

Roofing over wet underlayment.

If the surface underneath is wet mold and mildew may form leading to the disintegration of the subsurface and the roofing felt. Roof replacement is expensive. It s installed directly on the roof deck and provides a secondary layer of protection from the elements including rain snow and wind. Can roofing underlayment get wet.

A wet installation can also cause a new roof to fail. This provides added protection against ice dams. There are three main types of roofing underlayment. As we mentioned above underlayment is an added layer of protection for your roof.

The purpose of underlayment. If the sheathing or wood is wet during the time of installation it can trap moisture inside of your roof leading to mold rot or other severe problems. Roofing felt applied over a wet roof deck or shingles applied over wet roofing felt traps a layer of moisture within the roof. Roofing underlayment or felt provides an extra weather barrier in case of blowoffs or water penetration through the roofing or flashings.

It is applied under all other roofing materials as an added layer of protection from severe weather. If we only performed roof installations during dry weather we d have nothing to do for six months. This moisture can lead to mold and mildew forming underneath the shingles. Shingles and roofing materials may not adhere properly to slick surfaces with high humidity.

The nrca national roofing contractors and manufacturers association roofing manuals construction specifications institute standard federal construction standards from various agencies and internationresidential building code used by most states all prohibit placing either the water barrier membrane or shingles over wet substrate. Roofing underlayment or felt protects the roofing from any resins that bleed out of the sheathing. Roofing underlayment is a water resistant or waterproof barrier material that is installed directly onto your roof deck. Roofing underlayment or felt helps prevent unevenness in the roof sheathing from telegraphing through the shingles.

This shortens the effective life of the shingles and can adversely affect the roof sheathing. Roofing underlayment is what lies between the shingles and the roof sheathing or roof deck which is typically either plywood or osb. However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life.