How to Install Metal Roofing on Shingles
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How to Install Metal Roofing on Shingles

A DIY project to install metal roofing on shingles requires specific steps to insure there is minimal damage to the metal panels and the installation is successful. Several experts and metal roofing manufacturers specifications are offered for advice and a guide to the homeowner do-it-yourself handyman or homeowner wishing to contract out this type of home improvement renovation project.

A DIY project to install metal roofing on shingles requires specific steps to insure there is minimal damage to the metal panels and the installation is successful. Several experts and metal roofing manufacturers specifications are offered for advice and a guide to the homeowner do-it-yourself handyman or homeowner wishing to contract out this type of home improvement renovation project. Good planning in advance of this type DIY & home improvement project is a must.

Underlayment over the old shingles

You should always put a new underlayment over the old shingles. Whether spaced boards are put down or you put a sheet type underlayment direct over the old shingles is very much a recommendation of the metal roofing product chosen. Most recommend a 30 pound felt or have their own sheeting material they recommend be used.  You need to confirm with the roofing manufacturer specifications on how their product has been tested and their recommendations on how it is to be installed. A spaced board or sheeting underlayment can prevent warping of metal panels and leaking of the new roof.

What metal gauge should be used?

Metal gage is dictated by product design and anticipated loading on the.roof.  Check into what testing your metal roofing has passed for a particular region's weather conditions and code requirements as to wind and snow conditions prevalent  in the building site region. Contact your local jurisdictional building department authority to obtain the specific requirements to use before researching metal roofing manufacturer specifications. In many instances a 26 gauge metal roof can be used.  Again, check the building department jurisdictional authority. They will tell you.

Can metal roofing be installed over asphalt shingles?

This is determined by the aged and worn or deteriorated condition of the shingles and the type of metal roofing being installed. The manufacturer specifications or experts of the roofing you choose will be able to help with this question. Usually, the more heavily formed metal roofing profiles (depth of bends and stronger gauge) are better suited for this. If the asphalt shingles are in seriously aged. worn, extremely damaged or deteriorated condition,  solid sheeting underlayment must be used for a warrantable metal roof installation.

How can you prevent uneveness when installing metal roofing over old shingles?

Some of the minimally  textured metal roofs might show unevenness if installed over old shingles. You need to take  note and ensure that secure fastening through the old shingles is done during installation.  Again, follow the metal roofing manufacturer recommendations and specifications for application directly to asphalt shingle roofing.

Will asphalt singles melt from heat build up under new metal roofing?

Experts have not seen anything like this in their many years of roofing experience.  However, almost all maintain the need for new underlayment beneath every new metal roof and good attic ventilation through the use of clear soffit vents, ridge vents, or turbines installed in or on the existing roof.  Good attic insulation should be used also.

Always choose an experienced and qualified installer with good references.

Make sure the installer is recommended by your local roofing material supplier, like the home stores, or the actual shingle manufacturer.  Most have on-line sites where they provide local contacts to inquire as to qualified installers.

Always obtain a minimum of three qualified bids for an install metal roofing on shingles project.

Always obtain a minimum of three, preferably five, price quotes for your metal roofing project.  Ask for actual names and telephone numbers of homeowners who have used the particular roofing contractor. Make sure they have been in business a minimum of three to five years.  Ask for written references, preferably using AIA document A301, a standard for the industry.  Call your local AIA (American Institute of Architects) office and discuss what you are doing to get a better understanding of this contractor experience reference document.

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Do you know a good roofing installation contractor in Raleigh NC?

 

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