Roof Appears Wavy

If the material was damp if the day was humid or the paper bubbled a bit if could produce a wavy appearance on your new roof.

Roof appears wavy.

Having wet or poorly placed felt paper under your shingles can cause your roof to be wavy. The felt paper used on the decking was potentially wet or bubbly when laid down. If you have recently had a roof installed and it has started to look wavy there are the possibilities. Poor framing practice is one of the more common reasons for roof waviness.

When some of the crowns are up and some are down then the roof has a wavy look but it is still structurally sound. Despite the roof being sized and installed in accordance with the building code waviness between framing members may occur. When heated by the sun the strip will cause the shingles to lay down and bond together. A layer of felt paper acts as a base and goes down before the shingles for every installation.

When referring to asphalt shingles felt paper is what is typically used in this application. The carpenter may have failed to put all of the crowns up on site framed roofs. It is not uncommon for a new roof to look a bit wavy until this permanent seal is created. This type of roof wave is usually only seen after a new installation.

Underlayment is what we call the product placed between the decking and and the shingles. A roof with a wavy look to it can be caused by a number of reasons but the problem may be short lived. Frost outline on sheathing joints and over roof framing members. This will not affect the performance of the roof.

Shingles not sealing most asphalt shingles have an adhesive strip. Frost patterns on a roof can give the appearance of waviness without the condition existing e g.