In addition to the advantages presented above, it is important to take into consideration a number of points:
Metal roofs are more resistant than asphalt roofs, they offer more effective protection against the elements.
An insulating or properly insulated metal roof can save you between 10% and 40% of your energy bill.
In most cases, a metal roof can be installed over an existing asphalt shingle roof.
A metal roof is durable and able to withstand winds of up to 225 km/h.
Metal materials, like 316 stainless steel, are lighter than most other roofing materials, twice as light as an asphalt shingle roof.
Disadvantages
Like everything, a metal roof also has some disadvantages. Most can be treated or avoided if installed correctly by a qualified person:
The installation of a metal roof is a superior option compared to an asphalt shingle roof which is justified by a price that can be up to three times higher.
Depending on the type of fasteners used, a metal roof can be subjected to high stresses due to temperature differences.
A metal roof requires additional sound insulation.
In case of minor repairs, it is usually difficult to find an identical color panel due to the natural patina due to wear.
Improper installation can lead to water infiltration.
Although a metal roof cannot catch fire, it can present a difficult barrier to cross in the event that firefighters seek to penetrate the attic or need to go through the roof for any reason.
Misconceptions about metal roofs
Certain received ideas are commonly put forward when it comes to installing a metal roof. Here are a few :
“A metal roof is noisy.” – We all have in mind the image of driving rain on an old tin roof. A corrugated sheet is relatively flexible, which is why it behaves like a cymbal. Metal roofs are particularly rigid and are generally installed in parallel with a sound-absorbing covering. Some owners even believe that their home is soundproofed better since they installed a metal roof!
“It is impossible to move on a metal roof.” – We are afraid of deforming the metal roof simply by walking on it. However, be aware that any roofing material will warp if not laid on a properly designed frame. It is therefore quite possible to move on a metal roof if the latter has been installed according to the rules of the art.
“Metallic materials tend to rust.” – Yes, this is true if the roof has not been treated and does not have a galvanized coating or other form of protection. It is important to make sure that the roofer includes this type of treatment in his quote.
“Metallic materials accumulate heat.” – Like any material exposed to direct sunlight, be it metal, asphalt, slate or other roofing material. A metal roof can be coated with a colored coating whose color will be chosen so as to reflect the solar heat and will allow you to maintain a pleasant interior to live in. Note that a metal roof releases the heat stored during the day more quickly than an asphalt roof. This can translate into a 40% saving in energy allocated to air conditioning during the summer months.
“Metallic materials are likely to attract lightning.” – No, it is above all a question of height. A metal roof will not attract lightning any more than an asphalt shingle roof. The main difference is that shingles are susceptible to fire. When lightning strikes a flammable material, it logically catches fire. Asphalt is a petroleum derivative. A metal roof can completely withstand a lightning strike, it will even play a role in protecting your home!
“Metallic materials are very heavy.” – It turns out that a metal roof is actually 50% lighter than a slate roof and 75% lighter than a roof made of concrete tiles or fiber cement shingles.
Metal roof coverings: the different types.
Aluminum, copper, stainless steel, tin and zinc are the most common materials used for metal roofs.
Aluminum – In addition to being easily recyclable, aluminum is one of the most malleable metals. It can be easily shaped and molded to suit all styles and roof configurations. Aluminum has natural reflective properties which makes it one of the most energy efficient materials.
Copper – Copper is a very durable metal. The Statue of Liberty is coated in copper, it was installed in New York in 1886. The greenish patina that covers the copper protects it from corrosion.
Stainless Steel – Stainless steel is an alloy of chrome and steel. It is particularly resistant to corrosion and rust. Stainless steel has a very good reputation. It has been used in major works such as the Chrysler Building in New York.
Pewter – Pewter is a cheap material. It has corrosion resistance properties, in addition to being easily shaped.
Zinc – Zinc is a naturally occurring metal that has “self-healing” properties. A protective film forms on its surface and makes it possible to somewhat attenuate marks and scratches.
It is also interesting to look at the method of fixing the roof. Exposed fasteners are more economical. However, if the fastener is exposed to the elements, the risk of infiltration is higher. A competent roofer will first lay down the old roofing materials and use an underlayment to minimize this risk. Concealed fixings are a premium option but as they are protected from the elements the risk of infiltration is much lower. The final rendering is more elegant.
Thickness The thickness of the material is an important factor to consider that directly influences the cost of your project. The roof comes in the form of rolled metal sheets or corrugated or ribbed plates that take on the appearance of classic tiles. Depending on the type of metal, its thickness, the complexity of the site and the installation technique, prices can vary greatly. Do not hesitate to ask for several quotes from professionals for different materials in order to make an informed decision.
Coated
It is strongly recommended that you have a coating applied to your metal roof, both to provide protection against the elements and from an aesthetic point of view, for color. Most coatings will limit whitening of your roof, that is to say the appearance of a whitish veil due to natural oxidation. These coatings are generally resistant to discoloration at given temperatures.
For an irreproachable rendering carried out by a professional equipped with powerful and adapted tools, you can plan a budget between 2,000 euros and 3,000 euros to have your metal roof painted.
Style
First of all, you need to think about the type of roof you want to install. Not all metallic materials are created equal and cannot be used in the same way.
Standing seam panels – This is the most common type of metal roofing. This technique consists of folding the lateral sides of two adjacent panels so that they can be joined together, thus giving the roof that ribbed appearance. Panels over 6m are fitted with concealed and removable fixings which attach directly to the framework. This allows the panel to contract and expand depending on weather conditions without applying too much tension. This model designed for the harshest climates is particularly interesting. It is possible to obtain this type of model in steel, aluminum, copper and zinc. Count around 80 euros to 150 euros per square meter.