roof

[jaybird3897]

I am in the planning stages of building a 32x48x12 pole building. I am going to do in floor heating in the future and need help with deciding on roof. I like the look of a shingled roof but in my neck of the woods metal is cheaper. With metal I can go 4'oc trusses instead of 2', sheathing is not expensive but good shingles are pretty expensive. I have heard a lot of people don't care for metal because of condensation and noise. I know I need to install a barrier but I am thinking of just going with shingles and 2'oc trusses. Any thoughts on this?

 

[jaybird3897]

Been talking to people in my area and many of them are saying go with good shingles since most of them have had some leaking problems with metal. Metal would be cheaper for the simple fact I have to buy twice as many trusses and osb for shingle roof but I would guess it would hold heat better when I get it heated, plus be easier to insulate. Still pondering this one.

 

[betterbillt]

Been talking to people in my area and many of them are saying go with good shingles since most of them have had some leaking problems with metal. Metal would be cheaper for the simple fact I have to buy twice as many trusses and osb for shingle roof but I would guess it would hold heat better when I get it heated, plus be easier to insulate. Still pondering this one.

I'd be wondering how old the roofs are if they are leaking. The screws have came along way from the time of nails and rubber gaskets.

 

[MustangRick]

My old garage had the corrugated metal roof, it was nailed in with decent sized nails with the rubber washers. It was supported by 2x6 24" oc rafters with 1x8 horizontal planking spaced out about a foor or so. You did not want to be in the attic when it was raining hard or hailing because it was loud. You also did not want to be under the gutters when there was snow up there and the sun was out. The metal would flex and a load of snow would come flying down.

The gutters were nailed to a board that was not big enough to make that area air tight so there was plenty of air flow. I never had any condensation issues. I did occasionally see a leak from one of the nails but they would come and go. Not enough water would come in to worry about. This building was 30'x57', and the attic had about 10' at the peak. I think that angle was about perfect for the metal, could go a little steeper I guess if you are worried about leaks. I had to climb up there once and it was about as steep as you would want to go on metal. I would hesitate to do that again as long as you are not looking for an air tight attic.

 

[stingry]

I am in the planning stages of building a 32x48x12 pole building. I am going to do in floor heating in the future and need help with deciding on roof. I like the look of a shingled roof but in my neck of the woods metal is cheaper. With metal I can go 4'oc trusses instead of 2', sheathing is not expensive but good shingles are pretty expensive. I have heard a lot of people don't care for metal because of condensation and noise. I know I need to install a barrier but I am thinking of just going with shingles and 2'oc trusses. Any thoughts on this?

Since you are going to heat the shop, you will be insulating and the 2' oc trusses will make putting in a ceiling and insulating much easier.

Cheers
Steve

 

[betterbillt]

Since you are going to heat the shop, you will be insulating and the 2' oc trusses will make putting in a ceiling and insulating much easier.

Cheers
Steve

They do make 4 foot wide insulation. For that matter, they make 8 foot wide insulation.

 

[mtwaterguy]

If you use osb under the metal roof, that normally takes care of any noise problem.

 

[COWBOY]

where are you located ?

 

[jaybird3897]

I'm located in central michigan. Our snow load is 40psf. I originally wanted to go 4'oc with metal as it is a decent amount cheaper but I have heard a few bad things about the metal roofs expanding and loosening fasteners and getting leaks. Not to concerned about noise, I'm not sure if my inspector will allow osb over purlins, may have to go with 2'oc trusses for osb. I have never had a metal roof but I do know shingles work well. It is appealing to have a metal roof which should last a longer time than shingles, I mainly wanted one to save $$$. I can use half the trusses and skip the osb. What are your experiences with metal roofs using the newer fasteners, any issues with expanding/contracting, leaks?? Do your local inspectors allow osb over purlins and 4'oc trusses? Thanks for all your input

 

[jaybird3897]

anyone?

 

[shannonw]

Florida so no snow but tons of rain and I can't really comment on the requirements just metal roof in general in residential.

I've got an r panel gavalume roof (painted or whathaveyou) i put on a 30 foot long dock roof, no clue what i was doing and did most of the fasteners wrong (angled, too tight, was in a hurry, and i didn't do some things like install the strips between panel edges), no biggie as it was a dock but 10 years later and many hurricanes still doesn't leak.

I had 5v crimp galvalume (unpainted) put on the house...with the energy credit it was only slightly more than 25 yr good shingles which have a pretty short lifespan here..., I figure based on my dock experience i should easy double the lifespan of those shingles. They expand and contract with the heat and cooling here big time....but the people i see with roofers out are tile and shingled (wind,etc).

No shortage of metal roofs here. I did notice the screws are different (or maybe there were others when i did my dock), but the house roof they have a metal dome over the entire gasket..whereas the dock was a screw with gasket. The new ones seem like a good idea to me in this environment.

Only complaint is i don't go up there, it's slippery as heck so i call people in to do some stuff, but compared to my 25 year tile roof this is worry free to me!

 

[bigscott25]

I have a metal roof in my barn. 48" o.c. 1/2" foam board under metal on top of truss. No issue of leaking yet. Noise is not that bad either. Barn is only been up for 3 years though.