If you have a metal roof over shingles, you may wonder how to install it. The installation process is actually very easy, but it’s important to know where to start and what to do along the way. Here are some tips for installing a metal roof over siding:

Hire a Roof Inspector First

A roof inspector is a professional who will walk you through the process of installing your metal roof. It’s important to hire a roof inspector because it will help ensure that you are installing the right type of material on your house and that there are no problems with the installation.

A good local Roofing service in San Mateo should be able to point out any potential issues and explain how they were addressed or avoided in their past work.

Repair Leaks and Rot

You should also be aware of the signs of leaks and rot. If you see any of these, it’s important to fix the problem before your roof becomes damaged.

● Rainwater is leaking between shingles or under them.
● Shingles are separating from their frame because they’re warped or old and brittle.
● Metal flashing is peeling away from your metal roofing material due to corrosion; this can cause serious problems with moisture entry into walls if not addressed immediately by a professional contractor.

Protect Against Condensation

Use a vapor barrier. The most effective way to protect against condensation is by using a foam-backed flashing that’s attached directly to the roof decking, or by installing it in advance of your shingles and caulking around the edges of the metal roof. Both options are designed to keep water out while allowing air flow through them.

Install an ice dam on top of your metal roofing material before installing shingles over it (or at least install one when you’re ready). This will help prevent condensation from collecting on top of your metal sheeting during winter months and then dripping down into your attic space where it can cause damage if not remedied soon enough—especially if there’s already been some deterioration due to weather conditions like snowfall earlier this year!

Underlayment vs Purlins Installation

If you’re installing a metal roof over shingles, you’ll need to install underlayment. This is a layer of insulation that goes on the roof before the shingles are installed. Underlayment helps insulate your home by preventing heat loss through gaps in your walls and floors, which can make it harder to keep warm in colder months.

Measure Your Roof

Before you can begin installing a metal roof, you must measure the roof length, width and pitch. The most important thing to measure is the attic space. This will be where your shingles will sit and where they’ll go when they are installed.

Installing Edging, Panels, and Flashing

Edging, panels and flashing are all used in shingle roofing. The edging is the metal that goes around the perimeter of your roof. Panels are made up of two or more sheets of metal attached together by rivets or nails to form shapes like squares, triangles and rectangles. These pieces can be installed separately or together as part of a panel system (also known as batten). Flashing is used to protect against water leaking into your house if there’s any gap between valleys (the gap between shingles), valleys don’t always fit perfectly so they need some protection from getting water inside them when it rains heavily during storms.


So, now that you know how to install a metal roof over shingles, it’s time to get started. There are a lot of variables involved in this project, so it’s important to hire a roofing contractor with experience and expertise in this field as well as access to quality materials.