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Old 09-18-2012, 07:44 AM   #16
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Metal roof for residential homes?


There are high temperature underlayments for metal roofs.

It is better to tear off existing due to weight of existing shingles, possibility of bad decking, levelness, etc...

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Old 09-18-2012, 08:10 AM   #17
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Metal roof for residential homes?


+1

There are high temp underlayments like shazapple said. They may not be necessary depending on the color range and pitch of the roof.

I would always strip the original roof and put the new roof directly down on the roof deck. I am not a favor of going overtop of the roof at all.

There is no issues with noise if the roof is a solid deck. That idea of a noisy metal roof was for the older roof systems that were not on a full width roof deck and were instead on purlins.
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Old 09-18-2012, 04:24 PM   #18
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Metal roof for residential homes?


Thought I'd post this for reference and thought. Got this response from one roofer when asked if they do metal roofs and how much it might cost compared to shingle roof:

"We used to do a lot of metal roofs. They are great products, but started to slip in terms of the percentage of installation and are down to about 1% of the market for the last five years or so. This made the good installers leave to other areas that were building new metal roofs for new construction.

We cut it for quality control reasons. But it will be about two times the cost to do it right."

So it seems at least in northern California (Bay Area), it's not a popular option.
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Old 09-18-2012, 05:14 PM   #19
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Metal roof for residential homes?


I'm in NorCal, I don't see that style of roof on many residentials, thought i see it with some frequency on commercial buildings. If you are intent on one you might want to ping a commercial building architect and see what they suggest.

Keep in mind that these are not "fire and forget" roofs, you do have to do maintenance. I've seen more than one of these things develop a rust problem, and it's really noticeable since the rust runs down the channel and stains the whole thing.

Last edited by weekendwarrior9; 09-18-2012 at 05:57 PM.
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Old 09-18-2012, 05:32 PM   #20
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Metal roof for residential homes?


Quote:
Originally Posted by daluu View Post
Thought I'd post this for reference and thought. Got this response from one roofer when asked if they do metal roofs and how much it might cost compared to shingle roof:

"We used to do a lot of metal roofs. They are great products, but started to slip in terms of the percentage of installation and are down to about 1% of the market for the last five years or so. This made the good installers leave to other areas that were building new metal roofs for new construction.

We cut it for quality control reasons. But it will be about two times the cost to do it right."

So it seems at least in northern California (Bay Area), it's not a popular option.
The reason the market has somewhat gone away is the same reason that many quality products have gone away....the economy.

At this point, if most people need a roof, they are shopping on price and not quality.

If you are looking for a near permanent solution...metal is time tested and proven.

Sure it will initially be more expensive but it is invariably cheaper in the long run if you own the home for 15 years and have to deal with the potential replacement or depreciated value of your existing asphalt roof. Forget what that asphalt roof is going to cost in 15 years.

Just got another price increase last week. Go figure.

Quote:
Originally Posted by weekendwarrior9 View Post
I'm in NorCal, I don't see that style of roof on many residentials, thought i see it with some frequency on commercial buildings. If you are intent on one you might want to ping a commercial building architect and see what they suggest.

Keep in mind that these are not "fire and forget" roofs, you do have to do maintenance. I've seen more than one of these things develop a rust problem, and it's really noticeable since the rust runs down the channel and stains the whole thing.

Also, unless you are building a new structure, it will be likely that you will have to reinforce your roof trusses to take the weight of these things.
While it is theoretically possible that you would need to re-coat the roof, most newer roofs have a minimum fade warranty that is 20+ years on the standing seam styles (as pictured previously)

If the poster is looking at a stone coated steel, many of them have 50 year non-prorated warranties.

If he is on the coast where there would be salt spray, he/she should use aluminum and there is no issue of rust at that point.

You are incorrect on the weight issue. Dimensional shingles will way anywhere from 1.5 - 2X what a comparable steel roof will way and if you look at some of the super premium laminated units (Landmark TL for example) they can be as much as 3X the weight and then some.

Metal, contrary to popular belief, is not heavier.

Metal is also going to have a much higher wind resistance.
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Old 09-18-2012, 05:45 PM   #21
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Metal roof for residential homes?


Huh, I stand corrected then. I had been told they were heavier. That's what I get for not researching something on my own!

I have seen a number of rusty roofs though, maybe the sealing technology when they were installed wasn't as good as modern ones.
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Old 09-18-2012, 06:08 PM   #22
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Metal roof for residential homes?


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Originally Posted by weekendwarrior9 View Post
Huh, I stand corrected then. I had been told they were heavier. That's what I get for not researching something on my own!

I have seen a number of rusty roofs though, maybe the sealing technology when they were installed wasn't as good as modern ones.
WW,

Common misconception and empirically what you would think just thinking of "metal".

The newer finishes are really good and especially when down on a thick, heavy gauge material. I have been back to look at 15 year old roofs with the newer finishes on them that look awesome.

If you can afford it, metal is the way to go!!!
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Old 09-22-2012, 11:06 AM   #23
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Metal roof for residential homes?


* for metal roofs for reroofing, better to tear up old roof and put new or install metal roof over existing roof? Install over existing only as last resort to save costs & manpower? Just asking as some online resources mention you can install over existing to save cost/work and need to trash old materials.

My preferance would be to strip it down and do it as a new roof.
Less chance of code changes affecting resale financing later.
Dead load.
Repairs as you're installing "new" roof, ie/ rot or infestation.
But that's just me
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Old 09-22-2012, 12:25 PM   #24
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Metal roof for residential homes?


Your preference is correct.

Best bet is to strip to the original deck and to therefore be able to make any modifications at that point.

Always best to start with a clean slate and that asphalt on the roof will somewhat eliminate the benefits of the metal roof.
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Old 09-22-2012, 07:17 PM   #25
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Metal roof for residential homes?


Quote:
Originally Posted by weekendwarrior9 View Post
I'm in NorCal, I don't see that style of roof on many residentials, thought i see it with some frequency on commercial buildings. If you are intent on one you might want to ping a commercial building architect and see what they suggest.

Keep in mind that these are not "fire and forget" roofs, you do have to do maintenance. I've seen more than one of these things develop a rust problem, and it's really noticeable since the rust runs down the channel and stains the whole thing.

Some of the original metal roofing in CA (and probably the US) was in your backyard in the very late 70's to early 80's. To say you dont see them just means they did there job right. Most of the metal in CA (residential) simulates tile or shake and unless your in the metal roofing business you would have a hard time telling that it is infact metal. The largest roofing company in CA back then installed only Decra tile and Decra shake, its there, you just dont recognize it as metal. Now look how many more profiles Decra has now not to mention 20 other established manufacturers. Five of the homes my folks bought in CA all had Decra roofing on them.
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Old 09-23-2012, 01:12 PM   #26
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Metal roof for residential homes?


A timely comment Andy...

I asked about metal roofing to roofer I was getting quote from. He updated quote to include metal roof options:

composition asphalt shingles: $10-12k depending on standard/premium versions of shingles

Gerard Metal Shingles: $15k

Firestone Standing Seam Metal Roof: $27.5k

So got some more questions now:

How does metal shingles compare to standing seam metal roof? Unless the roofer is cutting corners or not going to be doing things right, seems metal shingles not so costly to regular shingles. Do all metal roofs last long time and work well regardless or one type better than the other?

Also for metal shingles, would they be installed w/ same underlayment as composition shingles or would it be of different material and process?

Going with Andy's comment, I'll consider metal shingle/shake/tile roof when I reroof if the cost isn't too much (as such from this one roofer quote) and if I can find a good roofer. Have at least one roofer right now need to get more quotes.
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Old 09-23-2012, 01:54 PM   #27
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Metal roof for residential homes?


How does metal shingles compare to standing seam metal roof?

They are too many differnt types of metal roofing to fairly compare them to each other. As far as warranty, they are all about the same.

Also, "metal shingle" typically is a specific type of metal roofing that simulates composition roofing. For example Metro Shingle, it is a simulated composition roof but in a metal "shingle". Decra Shake is made to look like wood shakes and Gerard Barrel Vault is a Spanish tile type of metal roof.

Standing Seam is painted, copper, SS, Alum ect..

Metal shingles, shakes or tiles can be stone coated, painted, copper or Alum ect...

There is a metal roof for every application imaginable.



Also for metal shingles, would they be installed w/ same underlayment as composition shingles or would it be of different material and process?

Maybe. The underlayment will be determined by each manufacturers installation requirements. If the metal roofing is in contact with the underlayment then it would an HT type. If your battening ( 1x4 & 2x2 ) a home and the metal roofing is in contact with the wood battens, they tend to use 30lb or 40lb felt. It is up to the manufacturer and the type of installation your doing that can dictate the underlayment.


Make sure if you have a metal roof quote, it is from a company that can show you they do them regularly and can back it up with a installation list. You DO NOT want a company who does not do metal regularly to install your metal roof. You will need to go look at soem of thier installs also, do not assume it looks good because it is on a list.

Last edited by AndyWRS; 09-23-2012 at 02:26 PM.
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Old 09-23-2012, 02:58 PM   #28
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click this

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Old 09-23-2012, 03:06 PM   #29
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OMG it is clickable, i am such a noob.

Last edited by AndyWRS; 09-24-2012 at 07:46 PM.
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Old 09-23-2012, 05:10 PM   #30
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Metal roof for residential homes?


Great info in post #27 Andy.

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