- Picking the right panel is crucial for your project
and there are many things that go into that decision,
including location, building design, local codes
and requirements, look and more.
Today we are taking a deep dive
in the SMI inch and a half snaplock 550 panel
and learning about its application,
engineering, installation and when you should and shouldn't
choose it for you roof.
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What's up guys, welcome to The Metal Roofing Channel,
I'm Thad Barnette, subscribe and hit that notification bell,
if you're new, we release metal roofing
and metal construction content every Monday and Wednesday.
In this series, we look at a specific profile
and discuss when you should and shouldn't use it,
installation requirements, applicable engineering and more.
Our profile today is the SMI inch and a half snaplock
550 standing seam profile.
Let's start with the basics.
It's a standing seam snaplock system,
which means it's installed with hidden clips and fasteners
on the male leg and the female legs snaps on
to engage the panel.
It has a maximum 19 inch panel width
when it's formed with steel
and a maximum 15 inch panel width
when it's formed with aluminum.
And speaking of materials, you can use 22 gauge
to 24 gauge steel or .032 to .040 aluminum.
If use the same material in a heavier gauge
or a narrower width panel, the engineering is still valid.
This panel uses approximately five and one eighth inches
of material to be formed.
When it comes to slope, snaplock profiles are intended
for steep slope applications.
They're hydrokinetic systems, which means they must shed
water quickly to remain weather-tight.
Most snaplock profiles have a minimum slope requirement
of a 3/12, but the SMI inch and half 550 is different,
due to the ASTM E 1646 water penetration testing,
SMI allows it to be installed at slopes
as low as 2/12 based on certain conditions
like location and building design.
The reason it does so well in testing
is that it has a continuous locking mechanism
on the male leg down the length of the panel,
as opposed to other snaplock systems
that only lock onto the clips.
We talk about engineering all the time
because it uses actual data gathered
about the exact panel profile and ensures
that if you install your roof per those specifications
you're giving it the best possible chance to perform.
For the SMI inch and a half snaplock 550 panels.
There are a couple of UL 90 construction numbers available
but there are also a variety of engineering specifications
from test performed in a laboratory by Sheffield Metals.
The SMI inch and a half 550 panel has been tested
in steel over plywood and aluminum over plywood B-Deck
and B-Deck with ISO,
for UL 580 and 1897 Uplift Testing.
ASTM E 1680 air infiltration testing
and ASTM E 1646 water penetration testing.
The panel is also rated for class four impact resistance
through UL 2218 and can be used in a class A fire rated
assembly via UL 790 testing.
For projects located in Florida or Texas,
the panel holds both FBC and TDI approvals
when using steel over plywood.
This panel is eligible for use
and weather-tight warranty projects
through Sheffield Metals and qualifies
for the standard SMI 40-year PVDF paint warranty
and Galvalume warranties.
Some upcoming testing for Sheffield profiles
includes finishing HVHZ approvals for Florida,
upgrading some non engineered profiles to have testing
and doing even more testing on current engineered profiles.
Stay tuned for updates on those.
This panel is a good choice
for residential or commercial projects with slopes
at or above a 2/12, depending on the conditions.
It's a great option when you don't wanna use
the extra labor to seam panels.
The panel is installed faster and requires less labor
than mechanical seam profiles
which translates to a less expensive system.
It's also a good choice when
you want an engineered assembly,
if you're interested in a commercial weather-tight warranty
or when you want testing, but don't want the bigger rib
that the similar inch and three quarter snaplock panel has.
And because it simply snaps together
it's good for DIY projects
if you're planning on taking the installation on yourself.
Don't use this panel over open framing,
at slopes below a 2/12,
or if you think the boxy ribs might look
too industrial or bulky
Let's look at how this goes down on a roof.
Make sure to follow the engineering guidelines
as to what deck substrate you can install over,
proper clip spacing,
approved accessories and other additional requirements.
I've already fabricated these panels with a one inch bend
at the eave and a one inch box at the top.
But if you want to learn how to do it yourself
there's a couple links in the description.
On the deck, the panel hooks onto the eave,
is pinned on the box end with a couple fasteners
and uses approved fixed clips on the male leg.
This bead of sealant prevents siphoning
of water at the end of the panel.
The next panel hooks onto the eave and snaps in place.
It gets pinned as well.
And the process repeats across the roof.
The tab that I left on this Snaplock profile is optional
and for aesthetics only, you don't need it
but sometimes it's a nice touch.
Because the panel is only pinned at the top
and it snaps in place,
it can expand and contract as needed at the eave.
The Sheffield Metals installation details
has a great thermal movement chart
that shows how much of a gap you should leave
at the eave based on the panel metal, deck material
and panel length.
Details for this profile
are available at sheffieldmetals.com.
And those details are recommended
for both commercial and residential projects.
This profile is newer compared to panels
that have been in the industry for a long time.
So if you're interested in the SMI inch and a half 550
double-check to make sure it's available in your area.
If you want to know more about this panel
or other panels that Sheffield Metals offers,
I'll link their profile page in the description below.
Comment if you have any questions,
subscribe here to The Metal Roofing Channel.
As always I'm Thad Barnette and I'll catch you next time.
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