How to Screw Down Metal Roofing
Knowing how to screw down metal roofing will make the job go much smoother. Most people use this method to cover a non-living area, but some contractors will install it over an old roof. Before installing your new roof, you must consider the cost, expansion capability, and maintenance. Because metal expands and contracts when heated and cools, you need to know how to properly handle these changes. You can choose from a variety of materials depending on your budget and the type of roof you’re looking for.
First, you’ll need to determine the panel type. There are many types of metal roofs, including Western ribs and 7.2 Panel. Each panel has its own screws, with four or five located in the lows. There’s also one lap screw per panel, which should be connected at 12 to 18 inches on center. Finally, you’ll need to seal the edges of each panel with butyl tape to prevent leaks.
Once you have a general idea of the panel’s profile, you can pre-drill holes in it. This will ensure that the screw will be positioned in the right place. It’s best to pre-drill when using metal purlins. In addition, it’s a good idea to use chalk to mark the screws so that you don’t mistake them for nails. You can also use a clamp to keep the panels square.
Next, you need to decide what substrate to screw down the metal roofing to. While screw-down roofing is more affordable than standing seam metal, it’s still a risky choice. The metal roof will contract and expand, and the screws can back out if the screws aren’t protected by clips. In addition, without proper protection, water can penetrate and erode the panels. Ideally, you’ll have a square ridge.
While self-drilling screws are convenient, they are not always recommended. You can use a pre-drilled hole if you’re using a solid wood substrate. It’s better to use a solid metal roof instead of a screw-down one. The screws are often self-drilling and will not be visible once installed, so they won’t require any additional preparation. However, screwing down a metal roof is easier if the roof is in a standing seam.
In addition to screws, you’ll need to pay attention to the screws’ location. The screws should be placed at the bottom of the metal roofing panel. When installed at the bottom of the panel, screws should be placed low on the panel. In addition, they should be drilled only a few inches deep. The lower the screw, the better. The higher the screw, the more secure the connection between the two panels.