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Can Galvanised Steel Roofing Be Installed Over Asphalt?

If you have an old asphalt shingle roof, you may be wondering if you can put a steel one over it.

In general, it is possible as long as your original roof has only one layer, for reasons of weight. If your roof already has two layers or more, you will need to remove it completely, before having a steel roof fitted.

metal sheets for your roof

Choosing a Suitable Steel Roof

Your best choice of steel roofing sheets for installation over existing asphalt is steel shingles, which are small panels installed in a similar way to ordinary shingles in horizontal rows.

Steel shingle systems can be installed over an existing framework of 2x2s, presenting some big advantages. The frame is screwed to the rafters of the house roof with the interlocked metal shingles screwed to the frame. This means that the old shingles are protected and the roof should withstand winds of up to 120 mph without sustaining damage. The frame also creates a straight and flat surface, regardless of whether the old shingles are curled or the roof ridge is bowed. The frame also creates a gap for ventilation, preventing ice dams during the winter and keeping the roof space and house cooler during hot weather.

Pros and Cons of Putting Steel Roofing Over Asphalt

Placing steel shingle roofing over existing asphalt saves you the expense and hassle of having to remove the existing roof. You can also choose from a wide selection of different coloured shingles to blend with your exterior décor scheme. Metal roofs can be noisy, but placing a new roof over the old one means that noise shouldn’t be a problem as the old shingles will provide an element of soundproofing.

Steel roofing can be expensive, but it should last for the life of your home, unlike asphalt shingles that will require replacement after about 20 years.

sheets of metal in a pile

Upgrade Your Home’s Roofing Today

If your home has an old asphalt tiled roof that needs replacing, you may be able to install attractive, long-lasting steel shingles on top, as long as your existing roof only has one layer. For more advice and information on your steel roofing options, contact us at Bushbury Cladding.