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Zedman53 01-24-2012 12:28 AM

Metal roof questions
 
This is not a project I will be attempting on my own but Iíd like to educate myself on the subject as much as possibleÖÖ

I have a small 1.5 story 1920ís bungalow with your run of the mil gable roof and a small front overhang over an enclosed porch. The old 3 tab shingles are shedding grains at an alarming rate and are starting to curl up. Ventilation is an issue with this house so Iím sure the shingles have suffered for that but Iím slowly renovating the already finished attic and addressing this. I havenít detected any leaks but I think Iím on borrowed time.

I really like the look of those metal roofs with the raised ďribsĒ (standing seam?). You see a fair amount of them around here, presumably because this is snow country I guessÖÖ.

-Do these roofs actually have an advantage in snowy areas such as dealing with ice dams and excessive snow buildup? Or is better insulation/ventilation still the answer to that regardless of roof type?

-Does a metal roof help keep the living space cooler? I would think shiny smooth metal would be more reflective of the sunís energy than shingles made of asphalt but Iím no expert.

-Does a metal roof use a ridge vent? Sorta hard to tell from the street. House currently has 4 square ridge vents and thatís it.

-Can rigid foam board be installed under the metal roof to increase R value?

-As installed, which roofing system weighs more? Standing seam metal or architectural shingles? I only have 2x4 rafters so I figure the less of a load on them, the better.

Sorry if my questions sound stupid, lol. Thanks for any info.

rossfingal 01-24-2012 07:01 AM

Post some pictures.
How steep is the roof?

rossfingal

Windows on Wash 01-24-2012 07:14 AM

Quote:

Originally Posted by Zedman53 (Post 832954)
This is not a project I will be attempting on my own but Iíd like to educate myself on the subject as much as possibleÖÖ

I have a small 1.5 story 1920ís bungalow with your run of the mil gable roof and a small front overhang over an enclosed porch. The old 3 tab shingles are shedding grains at an alarming rate and are starting to curl up. Ventilation is an issue with this house so Iím sure the shingles have suffered for that but Iím slowly renovating the already finished attic and addressing this. I havenít detected any leaks but I think Iím on borrowed time.

I really like the look of those metal roofs with the raised ďribsĒ (standing seam?). You see a fair amount of them around here, presumably because this is snow country I guessÖÖ.

-Do these roofs actually have an advantage in snowy areas such as dealing with ice dams and excessive snow buildup? Or is better insulation/ventilation still the answer to that regardless of roof type?

They do not ice damn when installed properly. That being said, you should correct the heat loss/insulation issue in conjunction with any new roof.

-Does a metal roof help keep the living space cooler? I would think shiny smooth metal would be more reflective of the sunís energy than shingles made of asphalt but Iím no expert.

Metal releases all of its heat much more quickly so comparing and asphalt and metal roof of the same color, pitch, orientation, etc, the home with the metal roof will be cooler over the long run.

-Does a metal roof use a ridge vent? Sorta hard to tell from the street. House currently has 4 square ridge vents and thatís it.

They can if the attic is a ventilated design. All depends on the application.

-Can rigid foam board be installed under the metal roof to increase R value?

Yes, however, again the placement, necessity, or application depends entirely on the attic and construction.

-As installed, which roofing system weighs more? Standing seam metal or architectural shingles? I only have 2x4 rafters so I figure the less of a load on them, the better.

Asphalt, by a large margin.

Sorry if my questions sound stupid, lol. Thanks for any info.

No stupid questions, just un-asked ones.

See above.

Where in upstate NY?

dmc@RCR 01-24-2012 09:07 AM

[QUOTE-Do these roofs actually have an advantage in snowy areas such as dealing with ice dams and excessive snow buildup? Or is better insulation/ventilation still the answer to that regardless of roof type?

They do not ice damn when installed properly. That being said, you should correct the heat loss/insulation issue in conjunction with any new roof.
][/QUOTE]


A metal roof can reduce the leaking that occurs due to ice damming but it will not prevent ice dams from forming. In some cases it may add to the ice dam formation. Metal Roofs and Ice Dams
As WOW said, correct the heat loss/insulation issue first.

Windows on Wash 01-24-2012 09:24 AM

Quote:

Originally Posted by dmc@RCR (Post 833154)
[QUOTE-Do these roofs actually have an advantage in snowy areas such as dealing with ice dams and excessive snow buildup? Or is better insulation/ventilation still the answer to that regardless of roof type?

They do not ice damn when installed properly. That being said, you should correct the heat loss/insulation issue in conjunction with any new roof.
]

Quote:

Originally Posted by dmc@RCR (Post 833154)
A metal roof can reduce the leaking that occurs due to ice damming but it will not prevent ice dams from forming. In some cases it may add to the ice dam formation. Metal Roofs and Ice Dams
As WOW said, correct the heat loss/insulation issue first.

I should have amended my statement to point out that they still may ice damn, but they should not leak as a result of that ice damn. This is why you see the metal roof sections at the eaves of older roofs. Is it still possible, yes but exponentially more unlikely with the proper metal application.

The lack of penetrability on the metal keeps the water from backing up the metal and getting into the roof assembly and home.

Zedman53 01-24-2012 11:05 AM

Quote:

Originally Posted by rossfingal (Post 833058)
Post some pictures.

Quote:

Originally Posted by rossfingal (Post 833058)

How steep is the roof?

Looks like this:

http://i252.photobucket.com/albums/h...smallhouse.jpg



Quote:

Originally Posted by Windows on Wash (Post 833064)
Where in upstate NY?



Buffalo area.

In the end I still may go with asphalt shingles if the cost for a metal roof is way higher. Any idea how much more a metal roof usually costs installed than architectural shingles?

mae-ling 01-24-2012 11:42 AM

Cost totally depends on your area. For us metal is about double the cost when you include all the screws, flashings, strapping and what not.

mae-ling 01-24-2012 11:46 AM

Go and ask your Styrofoam insulation question in the Insulation Forum. Probably get more answers there.

dmc@RCR 01-24-2012 12:11 PM

Cost is usually double to triple. The problem is finding a competent installer. Most are just asphalt shingle installers jumping on the metal roof bandwagon without any sheet metal experience.
Another option is to cover the lower eave with metal and the rest of the roof with standard shingles.
Pictured here; http://www.roofingcontractorreview.c...hield1-46.html

Again, you need a competent sheet metal roofer to install.

Windows on Wash 01-24-2012 02:10 PM

Quote:

Originally Posted by Zedman53 (Post 833252)

Looks like this:

http://i252.photobucket.com/albums/h...smallhouse.jpg





Buffalo area.

In the end I still may go with asphalt shingles if the cost for a metal roof is way higher. Any idea how much more a metal roof usually costs installed than architectural shingles?

As mentioned, completely depends on the cost of materials, labor, and overhead. Every market is different and idiosyncratic.

When you do your roof, definitely look into insulation and changing the dynamics of your insulation schedule.

47_47 01-24-2012 02:54 PM

Where near Buffalo are you? I just had a metal roof installed and am pleased with the contractor. I know he does work as far north as Orchard Park. Let me know if your interested and I'll pm his contact info.

To the mods, please remove if my post is not allowed.

Todd Miller 01-24-2012 04:33 PM

-Do these roofs actually have an advantage in snowy areas such as dealing with ice dams and excessive snow buildup? Or is better insulation/ventilation still the answer to that regardless of roof type? They can shed snow more quickly and also be more resistant to leaks due to ice dams. But ice dams are indeed more about ventilation and insulation. Also, metal roofs can be damaged by ice dams, especially around valleys.

-Does a metal roof help keep the living space cooler? I would think shiny smooth metal would be more reflective of the sunís energy than shingles made of asphalt but Iím no expert. There are metal roofs with reflective pigment in the paints. Light colors will do the same thing. Some metal roofs have a small space between the metal and the roof deck and that can help as well. Additionally, they do shed gained heat quickly.

-Does a metal roof use a ridge vent? Sorta hard to tell from the street. House currently has 4 square ridge vents and thatís it. Most metal roofs can be installed with a ridge vent for exhaust. You then need soffit vents for intake. Good attic ventilation helps with a lot of things especially energy efficiency and avoiding ice dams as well as condensation issues.

-Can rigid foam board be installed under the metal roof to increase R value? Very rarely will I ever suggest doing this. There are risks associated with installing metal on foam and also insulation is usually best placed on the attic floor.

-As installed, which roofing system weighs more? Standing seam metal or architectural shingles? I only have 2x4 rafters so I figure the less of a load on them, the better. Standing seam will weigh from 70 to 140 pounds per square usually. The low end will be aluminum. Shingles weigh from 275 to 425.

I hope this helps.

Windows on Wash 01-24-2012 04:45 PM

Todd Miller is here...?

Welcome Todd. Good to see you.

:thumbsup:

Todd Miller 01-28-2012 10:26 AM

Haha, I think we both get around. :)

joecaption 01-28-2012 10:38 AM

Depending on the materals used you can get it colored, with a 75 year warrenty againt rusting.
I've seen many standing seam roofs that are 100 years old and if they were maintained are still fine.
Just do a key word search on metal fooring there's hundreds of sites to look over for more info.
I've noticed a lot of homes in VT, Up state NY and NH, going back to metal roofing.


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