Metal Roof

[Ron Gries]

Inspected a metal roof today and found a couple of concerns. One is the absence of a foam seal at the peak below the cap. Also, it appears that the overhang is excessive (16"). Is there a limit for overhang? What of the seal?
Thanks much for your comments.

[Gunnar Alquist]

Ron,

Don't know about the foam, however the overhang does appear to be excessive. The manufacturer's installation instructions should address that.

[Jerry Peck]

Typically, they all require a seal at the ridge, and they make a seal to match their configuration.

They also do not want that rake overhang like that, they want a supporting rake board and a wrap-over rake metal trim piece which helps keep that down when the wind picks up.

The overhang it way to long. Which makes the overhang not secured down where it is supposed to be, and it too requires a seal preformed to match the configuration of the metal roofing panels.

Plus, all metal roof manufacturers' installation instructions I have seen require the roofing to be installed starting that the end opposite the prevailing wind. It is that important. If you do not know the direction of your prevailing wind, call your local airport and ask them which runway they use most, that is is the direction of the prevailing wind.

Here is an example: In South Florida, I was flying out of North Perry Airport, the predominate runways were 9L and 9R (we had parallel runways 9/27 (E/W) and 18/36 (S/N) ), the prevailing wind was off the ocean, from the east, runways 9 meant you were landing/taking off heading E, into the wind ... 9 stood for 90 on the compass, 90 is east, 27 stood for 270, 270 is west, 18 stood for 180, 180 is south, as 36 was 360, which is north

Roswell, NM has a runway marked 3/21 (30/210 on the compass), by looking at the comparative skid marks from all the landings, most of the landings take place on Runway 21, meaning the prevailing wind in Roswell is basically from the SW (225 is SW).

That simply means the roofers *should have* started from the end of the roof on the NE end of the house, or the end closest to NE (as versus closest to the SW).

[Ron Gries]

Thank you for your quick reply. I am just finishing the report and my comments are inline with yours. That's good.

[Gunnar Alquist]

Roswell, NM has a runway marked 3/21 (30/210 on the compass), by looking at the comparative skid marks from all the landings, most of the landings take place on Runway 21, meaning the prevailing wind in Roswell is basically from the SW (225 is SW).

JP,

Roswell? Is that from the airport or the alien landing port? ;)

Whyever did you choose Roswell?

[Billy Stephens]

JP,

Roswell? Is that from the airport or the alien landing port? ;)

Whyever did you choose Roswell?
.
And Your Point Is. :D (we all know JP ain't from Around Here! )
.

[Gunnar Alquist]

.
And Your Point Is. :D (we all know JP ain't from Around Here! ).

Billy,

Now that you mention it, I do see the resemblance. :cool:

[Corn Walker]

Whyever did you choose Roswell?

I presume from Ron's location information. How boring.

[Edward Loughran]

This site should answer your questions.
How to Install Metal Roofing | Best Buy Metals (http://www.bestbuymetals.com/how-to-install-metal-roofing.html)

[David J. Smith]

The over hang would be a problem in colder climats with "snow". The weight of the snow especialy went it slides off the roof would probaly bend the over hang.

[William Brady]

Snow in this part of the country is not the issue however get a little north say Albuquerque and above and it is. Thank you Jerry for the info on prevaling winds. I see matal too and did not know that. In this area during the early spring the winds blow day in and day out. If we were near the ocean the RED flag would be up all the time. Thank you.

[Jerry Peck]

Roswell, NM has a runway marked 3/21 (30/210 on the compass), by looking at the comparative skid marks from all the landings, most of the landings take place on Runway 21, meaning the prevailing wind in Roswell is basically from the SW (225 is SW).


Whyever did you choose Roswell?


I presume from Ron's location information. How boring.

Correct, because that was Ron's location.

When I said " by looking at the comparative skid marks from all the landings", I fully expected to be asked 'You can see that from Ormond Beach?' ... or something to that effect. :)

[Gunnar Alquist]

When I said " by looking at the comparative skid marks from all the landings", I fully expected to be asked 'You can see that from Ormond Beach?' ... or something to that effect. :)

I missed that part, otherwise, I would have.

[Frank Suchodolski]

That roof will look really good when the wind peels it off. No wonder the hurricane /tornado damage is allways so devastating if thats how they roof.:eek: