Time to get rid of your old roof? Installing a metal roof is a bigger process than other roof installations, such as asphalt shingle, with a lot of moving parts and steps. Keeping track of it all can seem overwhelming.
Here at Western States Metal Roofing, we want to make the process easier by compiling all of our expertise and resources from being metal roofing manufacturers for over two decades.
This article discusses the tools, materials, and steps you need to know in order to have a successful metal roofing installation. We have also included installation videos to watch which demonstrate each step.
We will go over the installation of:
Underlayment
Fasteners
Trim/ Flashing
Corrugated Panels
Before we get started, it’s important to note that you should always read the manufacturer’s recommended procedures prior to installation of your new metal roof. It’s also important to be in compliance with local building code requirements.
Prior to installing a metal roof, you need to install roofing underlayment.
Roofing Underlayment Installation
Underlayment is an overlooked but necessary part of a metal roofing system. This roof covering serves as an extra layer of protection from water.
Installing underlayment correctly is the difference between your roof being weathertight or leaking. For this section, we will discuss a synthetic underlayment installation.
Tools For Installing Synthetic Roofing Underlayment
Roofing hammer
Roofing gloves
Utility knife
1.25" electro galvanized roofing nails
Step- By-Step Instructions Synthetic Roofing Underlayment Installation
Begin synthetic underlayment installation with the lowest section of the roof.
Install the synthetic underlayment over any part of the fascia that will be covered by metal eave or gable flashing.
How to fasten the top section of the roofing underlayment.
Fastening synthetic roofing underlayment along the fascia.
Fold the underlayment at the fascia corner and fasten with an EG nail.
Fastening the center of the synthetic roofing underlayment.
Overlapping synthetic roofing underlayment.
Overlap should run with the flow of water.
Fastening the overlap of the underlayment.
Roll underlayment horizontal to the fascia.
Corrugated Metal Roofing Installation - Fasteners
Successful fastener installation on metal roofing requires using the correct type of fastener for your roofing material and the correct screw patterns and placement.
The placement of the screws will vary depending on the panel profile and roof sheathing being used.
How Many Fasteners Are Needed To Install A Metal Roof?
A successful roof installation not only needs the right material, but the right amount of materials as well. Here are two easy formulas for determining the amount of metal roofing screws:
Take your square footage and multiply it by 80%
80 screws for each roofing square. A roofing square is 100 square feet.
Example: 3,000 square feet X 80% = 2,400 screws
Example: 30 roofing squares X 80 screws = 2,400 screws
How Many Fasteners Are Needed For Metal Roofing Trim And Panel Sidelap?
You will need one lap screw for each lineal feet of trim or flashing
Screw count for panel sidelap is determined by dividing the square footage by three and then dividing again by 1.5.
Example: 3,000 square feet divided by three (width of panel) = 1,000 then divide that by 1.5 (spacing O.C. of sidelap screws) = 667 screws
You don’t need metal to metal screws for the sidelap if using ⅞” Corrugated. You will only need sidelap screws for R Panel/PBR Panel and Western Rib/7.2 Panel.
What Tool Is Used To Install Fasteners On A Metal Roof?
A screw gun, not a drill, is needed to install metal roofing. When you let go of the trigger on a drill, it will not disengage. If you do not release the trigger at the right time, the screws will be overdriven which can damage the washers or even the panels. Using a real screw gun such as the Dewalt DW266, DW267, DW268 or the Milwaukee 6780-20 and 6790-20 lessens this possibility.
Use an actual screw gun with an adjustable clutch and a depth sensing control feature. Screw guns are designed for the torque to be adjusted which eliminates over tightening of the screws. Overtightened fasteners is one of the biggest errors made during metal roofing installation. When a variable speed screw gun is used, you are able to change the speed to eliminate this problem.
What Is The Right Screw Gun Speed Setting When Installing A Metal Roof?
In order to avoid installation errors, have your screw gun set to the correct drill speed settings. The correct speed for the drill depends on the substrate and screw type.
Use a 2,500 RPM screw gun for wood and steel substrates that are less than 1/4-inch thick.
Use a 2,000 RPM screw gun for steel substrates that are 1/4-inch thick and heavier.
Use a1,000 RPM to 2,000 RPM screw gun for 304 stainless steel screws.
Once you have your tools and know your fastener type, quantity, and panel you’ll be working with, you can prepare for the installation of the fasteners.
Metal Roof Flashing
Trim and flashing is the finishing touch that brings metal panels together to create both a polished appearance and makes your metal roof weathertight. Most roofs have many trim and flashing conditions, however, there are 3 types that nearly all roofs will require.
Common Metal Roofing Trims
Eave trim/ drip edge
Gable trim
Ridge cap
Eave Trim
Eave trim is the first piece of trim that’s installed on a metal roof. It’s used when gutters are not required and finishes off the low sides of your home. It also directs water away from the side of your home.
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