There are two main reasons.
Standing seam roof installation.
Standing seam consists of sheet metal roofing panels joined side by side and attached to the roofing deck with concealed fasteners.
When installing a standing seam it is strongly recommended that all asphalt shingles are removed before the installation in order to prevent avoid the telegraphing effect where horizontally installed shingles punch through the vertical sheet metal roofing panels causing unsightly dents that cannot be fixed removed.
The total price goes from 5 to 26 per square foot.
Running solo 15ft panels on an open section of roof with no protrusions or obstacles.
The area where each panel joins the next is raised above the roof s flat surface.
Panels are mechanically attached with hidden fasteners to a continuous solid substrate with an underlayment.
Standing seam metal roofing is sometimes called raised or vertical seam.
Installation of a standing seam metal roof involves joining vertical interlocking panels from the top of the roof ridge to the roof s eave edge.
We carry both stock and custom trims and flashings and provide screws and other accessories specific to standing seam installation.
This includes 3 400 to 10 200 for labor.
Unlike steel and aluminum shingles standing seam panels should not be installed over the existing asphalt shingles.
The detailing and attachment methods described within this manual best reflect steep.
This technique provides the cleanest look and shows no exposed fasteners.
Standing seam roofing is available in either acrylic coated or galvalume or several different colors low gloss paint systems on the finish side with primer and washcoat on the reverse side.
The metal roof system as described within this manual is classified as a standing seam metal roof panel.
First of all if you install a standing seam metal roof over asphalt shingles there will be a so called telegraphing effect where shingles can punch horizontal lines in standing seam panels.