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Metro Shingles and Shakes
Introduction
Stone-coated steel was developed in New Zealand over
50-years ago and even today this market as well as others in the Pacific Rim
use very little solid sheathing (Plywood or OSB sheathing) across the roof
deck. This, unique construction practice enabled stone-coated steel panels
to gain strong market share as they were easily mounted on “Battens”
(usually 2'X2' wood strips) that spanned the rafters and provided front and
back fastening points for each stone-coated steel panel. As these types of
products were introduced to North America the 'batten' application was
modified to accommodate applications over existing roofs such as Asphalt or
wood shingles and even wood shakes. In these installations a batten grid
consisting of '1X4 Counter-battens' (running vertically as a support batten)
and '2X2 battens horizontally across for the stone-coated steel panels to be
fastened to. Metro developed “Direct-to-Roof-Deck” installation methods
using its existing designs and after extensive testing concluded the
'batten-less' application over solid sheathed roof decks provided
exceptional wind uplift performance, just what the market needed to ensure
protection against Florida and other gulf state's hurricane prone areas.
Benefits
Whether a roof is installed on battens or
batten-less really depends on the climate & roof design. To
explain why climate has a bearing on the application method;
let's assume the home is in south Florida (West Palm Beach),
this market is considered by the building code as a severe wind
region Known as HVHZ (High Velocity Hurricane Zone) and in some
areas roofs need to withstand winds of up to 150-mph. In this
case Metro has proven in numerous scientific tests at
independent Laboratories (Underwriters Laboratories, UL) that
the highest performing wind uplift system is a Batten-Less
install method which uses two fasteners in an 'X' pattern.
On the other hand if your home is
located, say in Texas around the Dallas area not only is hail a
concern (All Metro products are Class-4 Impact rated) but also
usually the roofs are very steep and here is where a batten
system can provide a benefit to the Installation process as the
batten grid forms a ladder across the roof area to make the
install process a little easier.
Conclusion
Either method can be used to meet all
building code requirements across North America and both systems
(Batten or Batten-Less) can meet the new California Title-24 Energy
code exception of providing a minimum of 3/4" of air-space above the
roof deck sheathing which will provide an equivalent energy
efficiency of 15% providing a truly green roof for the 21st century.
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Shown here with Battens.
Metro Steel Roofs gives businesses
a unique look that sets you apart
in the marketplace.
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