Residential metal roofs

[SCBO1]

I was asked if we allow residential metal roofs, and could not find anything prohibiting them. Any issues or code requirements I should be aware of? We have a 90mph wind load here and we are in a moderate hail zone.

What do you require on a re-roof issue going from asphalt to a metal roof system?

Any comments would be appreciated!

 

[fatboy]

R905.10 and manufacturers specs.

 

[Yankee]

Yes, manufacturere specs but also, keep an eye out for existiing items on teh eve ends of the roof -- oil fills/vents, dryer or furnace vents, service entrances, , , , they may get easily covered by the snow sliding off the roof.

 

[Alias]

I was asked if we allow residential metal roofs, and could not find anything prohibiting them. Any issues or code requirements I should be aware of? We have a 90mph wind load here and we are in a moderate hail zone.What do you require on a re-roof issue going from asphalt to a metal roof system?

Any comments would be appreciated!

CBC requires a complete tear-off. Check the length of the fasteners that they are using. We have been having wicked winds (40 - 50 MPH gusts)since the beginning of the year and I have seen some panels on the new metal rooves twisted and damaged.

Sue, gee, it must be 4 pm, the winds are picking up.........:mrgreen:

 

[brudgers]

I was asked if we allow residential metal roofs, and could not find anything prohibiting them. Any issues or code requirements I should be aware of? We have a 90mph wind load here and we are in a moderate hail zone.What do you require on a re-roof issue going from asphalt to a metal roof system?

Any comments would be appreciated!

Just make sure there's a code report for the required windloads (the same holds true for shingles and any other roof covering). Though 90mph shouldn't really be an issue.

Of course it's an open ended question, 5-vee crimp panels from Home Depot, probably haven't been tested.

 

[peach]

They are beautiful and fairly maintenance free.. they are also loud in heavy rain and hail.

 

[Yankee]

I have one and I love it. Just wish it could keep the roof warm, like snow does.

 

[peach]

that's what insulation is for Yank.

 

[Yankee]

snow is the original insulation . . . . tried, true, free, , , ,

 

[peach]

true, Yankee.. snow, however, doesn't particularly come into play this time of year. Uplift can be an issue with them (which most manufacturer's take into account)... installing the metal roofing directly to the roof structure presents insulation and uplift issues. Don't install it like a barn roof.

 

[Yankee]

I don't disagree. I am just on an anti-"green" rant.

 

[peach]

rant away.. I hope I'm still around in 30 years when some of this "new, green" technology has a chance to mature.. see if anything is really saved.