Metal Roofs

A metal roof can be installed directly over existing shingles with or without strapping, but using wood strapping (furring strips) is generally recommended by most installers and manufacturers to protect the metal and manage moisture. Strapping (typically 1x4 wood boards) creates a vital gap between the rough shingle surface and the metal panels, allowing heat and moisture to escape.

Good Question, it depends on what profile of metal roof you are installing and the shape of the shingled roof it is going to be installed onto. There are many steel shingles profiles that can be installed directly on to the shingles, there are others (R-panel (ribbed exposed fasteners) that require the roof to be strapped to accept the new steel panels. If you are installing Standing Seam (hidden fastener) Metal roof the roof needs to be ripped off, substrate inspected, high temp ice and water and synthetic installed then panels are installed directly to the roof deck to achieve flat even look. Hope this helps. In a perfect world you would always remove materials and start fresh.

That depends on what’s going up there with the roof and shingles, layered and including what will it be like inside the house. Installing and properly venting the home makes it important to come with the right decision. What would it be like inside as well due to humidity, Moisture, and circulation around the house inside breaths as well. Most times I rip it all out start anew as most customers would rather get rid of it then regret leaving it on. Especially a metal roof. My recommendation build a new one. Saves headaches if rot happens to the roof underneath could invite critters as well.

Always use additional strapping when applying a steel roof over shingles and if stripping the roof there is a paint on membrane you can put on it before putting the roof on because metal roofs always sweat you want to have a good membrane

Even metal roof can be installed of existing shingles by creating a strapping surface to be attached, this can generate several technical and esthetical problems. Metal roof has a lot of size fluctuations due expansion and contraction of materials. Shingles are likely to affect the overall strapping structure adding to the metal movements, this can generate oil canning effect on the roof that will be noticeable during certain hours of the day. Additionally of compromising the plywood weather proof preparation. Important fact to consider. The load of weight on your roof, adding metal roof on top of shingles considering is only one layer will drastically increase the demand of performance of the plywood and overall framing of your house, also consider, during winter months the extra load of snow. If not properly forecasted this can create cracks on the interior of the house and even collapse a roof of the plywood is not in great condition. For better results, less maintenance cost, proper technical and performance of the elements, and esthetical aspects. We would recommend to remove the existing shingles, inspect the roof plywood, prepare the roof with a proper weather seal membrane such as Roofnado, create a strapping grid without obstacles so it is leveled and well fastened to the roof, and the install your metal roof. Metal roof is a big investment and what you're willing to have is a guarantee your roof last as long as the cost you invest on it.

Yes. It can go directly overtop and strapping definitely recommended!!! No matter the product!!