Underlayment is what we call the product placed between the decking and and the shingles.
My new roof is wavy.
This is normally not a problem unless you experience windy conditions that can catch the shingles.
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.
If you have recently had a roof installed and it has started to look wavy there are the possibilities.
When some of the crowns are up and some are down then the roof has a wavy look but it is still structurally sound.
The problem is you had a contractor do it and not a roofer.
A new roof that is of a heavier material if the original roof was wood shingles a light weight material and it was replaced with concrete tile a heavy material then the roof may sag or be wavy because it was not structurally designed to carry the heavier load weight.
The carpenter may have failed to put all of the crowns up on site framed roofs.
The problem is not the.
Applying a temporary adhesive will do the trick.
What happens here is that a contractor laid out your new shingles directly on top of your old ones creating an unnatural waviness that just isn t going to go away.
If you ve recently gotten a new roof and it got all wavy on you then here are the possibilities.
This type of roof wave is usually only seen after a new installation.
It is not uncommon for a new roof to look a bit wavy until this permanent seal is created.
The shingles were laid over an old layer of roofing.
It could be any number of reasons discussed above but it doesn t look overly wavy imo.
When someone walks on the roof the panels deform and have no internal strength to return to their old level which is why the roof looks wavy after the roofers finished.
This is a very unfortunate issue for everyone involved.
Cracked or damaged rafters or trusses.
The following are some of the more common causes for a wavy roof.
A new roof will be required after stripping both layers of shingles to achieve a quality flat look.
Inspect the plywood from the attic and look for cracks sagging or rotting.
Poor framing practice is one of the more common reasons for roof waviness.
If the felt paper was bubbly or wet when it was applied then it will cause the roof to look 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.
Multilayer roofs it is always better to tear off your old roof and install a new one.
Good call on the pipe river.
Having wet or poorly placed felt paper under your shingles can cause your roof to be wavy.
This is a bad move a roofing company should not lay new roofing shingles over shingles that are wavy.
