You should always put a new underlayment over the old shingles. Whether boards are put down or you go direct over the old shingles is very much a function of the metal roofing product you choose. Most codes now allow no more than two layers of roofing before requiring a complete tear-off.
So, if your roof has two layers, it may require a complete tear-off , even though steel is lighter than asphalt. Codes vary, so call your local building department to know how to install metal roofing over shingles properly, code- wise.
In this video we go over how we put a metal roof over shingles on our mobile home. Our year old she that we leveled in our last video, was in need of a new roof. We decided to replace it.
Metal Roofing over shingles. Make sure roof is square. Step by step instructions and videos on how to install metal roofing over an existing shingle roof. My answer often surprises people.
However, it is based upon experience with tens of thousands of installations over many years.
The second way to install a metal roof over a shingle roof is with the use of purlins or battens. The purlins are screwed or nailed down to the roof deck, depending on how the metal roofing manufacture has testing for their roofing panels, and then the metal is installed to the purlins. Homeowners looking to replace an aging roof have two basic options: they can either strip off the old roof and replace it with a new asphalt roof, or they can install metal roofing over the existing asphalt shingles. Unless building codes require it, there is usually no need to tear off the old roof. Installing metal roofing over.
Steel roofing offers many benefits over slate tiles or asphalt shingles. Manufacturers provide 30-year warranties on metal roofing products. Use furring strips to build a slat board on the roof, then mount the . After completing construction on a new barn, the customers asked me about the possibility of putting a metal roof on their home to match the roof on the barn.
A little reluctantly, I agreed and thus began a 15-year journey of installing more than. Now, assuming the average cost of $10. The low-end cost for steel shingles installed over -top of the existing roof would be around . I would like to know what the pros and cons are in regards to putting on a metal roof over your excisting shingles verses removing the shingles , and also if the warrenty is any different if you leave the shingles on. Like all such questions, more details are required before a definitive opinion can be . Yes, you can install a new metal roof over the top of an existing asphalt shingle roof provided there are not too many layers.
Find a better roofing contractor.
The old roofing should be remove underlayment installed and furring strips screwed down for the metal to be fastened to. If the old roof needs to be replaced why leave it there and . In these cases, removing the old asphalt roofing shingles is usually recommende but this creates a large amount of landfill waste. In fact, asphalt roofing shingles make up over of all municipal solid waste, or 6. For an easy installation , consider purchasing your metal roofing materials from a registered dealer.
In addition, buy shingles or metals from reputable companies who can also advise you whether it is possible to install them over your old roof. Prevent leakage by securing the starter flashing to the roof with .