What Makes Our Metal Roofs Better?
Any steel roofing warranty, when looked at closely, cannot 100% guarantee against rust. Low quality coatings, cut edges and screw holes needed for installation will expose the steel and eventually trigger rust formation. If the idea of rust staining on your roof is unacceptable then a Classic Aluminum Roof is the answer. With unmatched durability, energy efficiency, environmental sustainability, and the most comprehensive lifetime warranty in the business, there is no better roofing product in Canada.
Concealed Fasteners and Why They’re Important
While old school metal roofs had exposed fasteners, design technology has brought roofs with concealed fasteners. The concealed fasteners don’t need the neoprene washers that wear out, because they are never exposed to the weather. Additionally, concealed fasteners, through clip design and sometimes panel design, allow for the thermal movement of the metal. The roof is held secure, but there are ways for it to float incrementally and move with temperature changes without anything breaking down or coming less weathertight with age.
- never exposed to weather – won’t wear out
- allow for natural thermal movement
- permanently weathertight
Direct to Deck Metal Roofing Installation – A Batten-Free System
Some metal roof panels are installed on battens while others are installed directly to the roof decking on an elementary level. Battens are rows of 1×2″s nailed to the roof first to provide a racking system for the roof panels to fasten into. This was another installation method derived from old school metal roofs installed over barns; so all panels installed over battens also have exposed fasteners. Putting down battens raises the level of the roof which means gutters have to be raised and the roof level can sometimes get too high on homes with dormer windows – the roof can begin to run into the bottom of the windows.
Metal roofers using wood strapping or battens will often say they use this old technique to control condensation by creating an air chamber to dry the inevitable drip or sweat from the metal shingle. This has proven to be an unreliable practice as the airflow is not adequate to dry the drip or sweat fast enough to prevent dampening and accumulation around the wood strapping. One need not be a construction expert to understand that wet wood rots. Ice in winter from condensation adds the element of expansion and contraction fatigue on the wood strapping resulting in premature rotting of the wood. If exposed fasteners are used on wood strapping this is also an intrusion waiting to happen once the neoprene rubber washers are compromised. With direct to deck install and hidden fasteners metal shingle condensation is a non-issue.