Metal roofing

[trailshredder]

Using 29 gauge residential metal directly bolted to clean new half-inch OSB with synthetic underlayment can work, but it's not the ideal setup. Without furring strips, you might encounter issues with unevenness and potential for water infiltration. I'd recommend consulting a good quality roofer for their professional opinion. They can advise on the best practices to ensure a durable and long-lasting roof installation.

 

[stevieb49829]

Trailshredder, the topic you are replying to is quite dated (September of '21). This sometimes happens when a new user does a search, or they jump down to similar threads, and don't realize the original post is out of date. If it's a post about a technical procedure, an addition to it might be helpful. If it's another opinion, on top of a bunch of old opinions, it may not even get read. steve

 

[db4600]

Yes roof.
Its my home.

I have shingles now but some of the OSB is damaged and other is soft.
People keep telling me just put 2x4 furring directly over shingles and leave soft OSB in place.
Just make sure you bolt the furring to the trusses.

Heck for $500 more than furring I can replace all the OSB with new.
Yes lots more work but this is my home.

Question is if I replace all the OSB do I need furring strips ??????

Replace the OSB, consider 5/8”. Synthetic paper. 29 ga is liner panel by old standards, but also what the industry has moved to for roofing. Use a green or brown color and the snow will let go and not stick like a lighter color.

 

[jhwis]

Without going into why

How will 29 gauge residential metal preform bolted directly to clean new half inch OSB and a synthetic underlayment.
IE: No furring strips.

My brother roofs. He uses firring strips. It's easy and better. Your roof can breathe. No worries on the soft OSB.

 

[DoubleO7]

Use a green or brown color and the snow will let go and not stick like a lighter color.

The poster asking the question is "john in la" as in Loo Wheese E Anna.

He would be better off to use very light colored or galvanized roofing.
Since unwanted heat gain is an issue but snow, not so much.

 

[TerryfromSWIowa]

responding to a 3 year old post, hope he has not waited to replace roof this long.

 

[Texasmark]

Without going into why

How will 29 gauge residential metal preform bolted directly to clean new half inch OSB and a synthetic underlayment.
IE: No furring strips.

You surely have a slope to the roof. Most steel of that type has ridges for strength and they can allow for condensation to run down to the eaves. The moisture barrier protects your wood. At 29 Ga. you might have some hail denting. I have 26 on part of my house and 26 on a 24x36 garage built in 1981. The house still looks new and the garage has the paint wearing off exposing the galvume (galvanized metal) that is still protecting the steel....no problems.

 

[used red MN]

Old-post-a-roo-itous strikes again.

 

[WNYBill]

TALK TO A PROFESSIONAL, LICENSED ROOFER AND HAVE THEM DO IT. Guaranteed you will end up with a triangle for the last piece. There are tricks to putting a metal rood on and the pros know them. DIY not so much.

 

[stevieb49829]

Old-post-a-roo-itous strikes again.

I tried to point that out yesterday, but I may have to use bold, or a different color text! steve

 

[DoubleO7]

The comments added to the thread yesterday to an "old" thread have valued opinions and commentary related to metal roofing that may be of value to someone contemplating a metal roof.

As such, if they were about to post another thread seeking the same opinions and comments about metal roofing, the "similar threads" function that pops up when you create the thread title, might just get them to read those "similar threads" before starting yet another "similar thread".

The comments about this being an "old" thread, not so much.

 

[WNYBill]

Oh my! Didn't realize it was old. I just remembered the mess we got into trying to DIY roof a 16x6 shed. Had a pro do a 40x14 and the last piece was just a square as the first.

 

[showcrop]

YT is a popular place to come to for information on many and varied subjects. Often people are not seeking the actual how to but rather information about how something has worked for someone else. Many of them know that someone who tends to be hands on with things mechanical, chances are is one who observes and ask questions about how many different things work and perform. One doesn't have to be a trained license professional to figure out if we like how something works, and we do have choices in most things that we buy. If there were no differences for different people and situations there would be no need for more than one of anything.

 

[chvet73]

We had installed a metal roof on our vacation home. The house was in a high snow area near Durango, CO. The very experienced roofer put it directly over the 2yr old shingle roof. Before the metal we could have 3’ of snow on the roof. The only issue we had was the metal caused the snow to slide off. Which it’s supposed to do. That in turn snapped all the vent pipes off. So I had to add snow dams at the vents. That made the snow slide by not thru the stacks. The roof was installed with screws that have built in insulating washers.

 

[jaoneill]

Without going into why

How will 29 gauge residential metal preform bolted directly to clean new half inch OSB and a synthetic underlayment.
IE: No furring strips.

Screwing the metal directly to 1/2" OSB will work OK until you get a wind storm. The screws will pull right out of 1/2" OSB, at minimum you should use 5/8" CDX. If you doubt me check with a major steel roofing manufacturer's installation guide. As some have indicated above you had best also delve a bit into the ventilation/condensation aspects of steel roofing, it's a major can of worms if not addressed properly.

 

[chvet73]

There were blizzard like conditions at my house. Don’t know how strong the wind was but no screws pulled out of the osb.

 

[jaoneill]

There were blizzard like conditions at my house. Don’t know how strong the wind was but no screws pulled out of the osb.

You may have been lucky or perhaps you happened to get a particularly good batch of OSB, but I spent 40 years writing construction specifications and was warned by two different steel roofing reps that typical 1/2" OSB doesn't have nearly enough holding capacity. The least expensive option is to use screws specifically designed for a low density substrate.

 

[jm.]

Yes roof.
Its my home.

I have shingles now but some of the OSB is damaged and other is soft.
People keep telling me just put 2x4 furring directly over shingles and leave soft OSB in place.
Just make sure you bolt the furring to the trusses.

Heck for $500 more than furring I can replace all the OSB with new.
Yes lots more work but this is my home.

Question is if I replace all the OSB do I need furring strips ??????

Do not do the 2x4 furring . Cool nights and hot days heats up sweats and water rots the 2x4 your plan is 20 years +

 

[used red MN]

The comments added to the thread yesterday to an "old" thread have valued opinions and commentary related to metal roofing that may be of value to someone contemplating a metal roof.

As such, if they were about to post another thread seeking the same opinions and comments about metal roofing, the "similar threads" function that pops up when you create the thread title, might just get them to read those "similar threads" before starting yet another "similar thread".

The comments about this being an "old" thread, not so much.

@DoubleO7 My purpose of making such comments is only to help out those who would like to get the most out of their “forum viewing pleasure” such as WNYBill who admittedly fell into the trap. I am not trying to wah wah about the additional replies being added, there is some quality stuff here. This post would have been setting in the archive doing nothing if new user “trailshredder” would not have decided it was worthy of a reply. (and welcome to him if he reads this!) My method to help out other members viewing pleasure is to alert former Classic veiw users that “every” post title in bold print indicating to them they have not read it yet is not necessarily a CURRENT conversation. So if they LOOK AT THE DATES they can easily see when the post was initiated and then they can make an educated decision of whether or not adding information is worth their time. In the future I will continue to chime in with short reminders as I placed above on revived threads such as this when I feel so inclined, but that will be all one and done.