Reroofing and the Metal Roof

Posted on

Typical roofing construction will last somewhere between 5 and 20 years. This includes roof coverings such as shingles, slate, or wood shake shingles. Metal roofing offers an excellent option for replacing these standard roofing materials at the end of their lifespans. Before considering this option however, one must first research their local zoning and code restrictions relative to roofing options. In actuality, some neighborhoods or new residential developments may have restrictions or specific guidelines for the use of roofing materials. To save on time and costs, it is important to educate oneself before getting started.

The Slate or Wood Shake Roof

When replacing a slate roof, the old roof should first completely be removed. This will help to alleviate the problem of having too much weight on the roof. Additionally, wood shakes are often uneven and thus may also provide an unacceptable surface on which to lay your new metal roof.

Note: Under many circumstances, it is possible to install a new metal roof over the top of existing asphalt shingles – even if there are two layers of asphalt shingles. However, it is important that you know the weight capacity of your roof and how many layers of shingles are currently on the roof. If going this route, make sure your roof deck is in good shape. If you  have had leaks it is quite possible that the decking of your roof (or some of it) needs to be replaced. If this is the case, you will have to remove the old shingles.

Installing a Metal Roof

Make sure your roof decking is in good shape. This is most easily done by getting into the attic and seeing if there are any water damages sheets of decking. Be sure to inspect it thoroughly and repair any problems according to your local building codes.

Once you determine the structure to be safe and sound, you can begin installing the new metal roof. This can be done in a few ways, including installing the metal roof on top of the existing asphalt shingle roof. If choosing this option, it is important to note that one layer of shingles weighs from 2.4 to 3.2 pounds/square foot. If there are two layers there, it will weigh anywhere from 5.0 to 6.0 pounds/square foot. In most instances, a structure can only withstand a maximum weight of 10 pounds per square foot so you should be good to go as metal roofing is not very heavy. Although adding a metal roof will add dead weight of only 0.8 to 1.5 pounds per square foot, it is crucial that you figure the weight capacity before determining whether it is safe to install the roof on top of another. If weight allows and the under roof is in decent condition, you may be able to save on the cost of a tear-off.

However, if the existing shingles are rotting or deteriorating, it will be necessary to remove these shingles, to at the very least, make an assessment of the underlying structure to determine its safety. You may potentially save costs by doing spot repairs before installing the new roof in lieu of a complete tear off.

If you opt to put the metal roof atop current roof shingles, it needs to be done in combination with a synthetic underlayment (recommended). This should then be followed up with galvanized steel hat channel (preferred method) or 1” x 2” furring strips. Screw fasten the purlins using fasteners directly screwed into the trusses or rafters. Choose your screw size based upon the thickness of the decking material. For example, if working with a thickness of 1 ½”, #9 screws are adequate but when attaching the panels to either plywood or OSB, you will need larger, #14 screws. In installation, be sure to space the purlins no more than 24” horizontally. And, when reroofing, the valleys must be filled in at least 12” from the center.

Connector Spacing

NOTES:

  • Furring strips must be designed to provide adequate uplift resistance.
  • Ridges require 2″ or longer screws to attach through the flashing and high rib.

Should you first remove the shingles, you will still need to install the underlayment or 30 pound felt. Another option for installing a metal roof over shingles requires first laying a vapor barrier pound felt followed by the Grandrib 3 panels. However, if using this method, you’ll need to be sure to work with fasteners that are long enough to reach through the plywood or OSB, while also being careful not to overdrive the fasteners as this can cause a problem with the panels. Finally, when you do not completely remove the roof and attach the panels to roofing shingles, imperfections such as waves and dips in the metal will be more clearly visible because of the need to fasten them tightly to the existing shingles.

More Information: See How to Install Metal Roofing Fasteners

If desired, you can also place the underlayment right over the old shingles or purlins to act as an added barrier from moisture and the elements. When installing, you’ll also want to consider these other tips:

  • In extremely hot temperatures, the asphalt may bleed causing residue to be on the worker’s shoes and potentially on the new roof. This problem can be alleviated however with the use of synthetic underlayment.
  • For added protection against ice and other elements, install ice and water shields along the eaves in valleys or where there is the possibility of cold weather.  See Condensation and Ice Damming on a Metal Roof.
  • The standard 30 pound felt will not work when used under a standing seam roof. In this case you will need to lay a slip sheet of red rosin paper before laying the felt.
  • You can also choose to install the metal roof over a Titanium underlayment. This underlayment is a suitable barrier; however the appearance of the metal roof can adversely be affected as it is difficult to use fasteners with this product. Consequently, Fabral discourages using this method.

Many panels are made to go over a solid substrate, this includes Climaguard, Horizon 16, Ultra-loc and 5-v Crimp. This solid substrate is needed whether you are re-roofing or working from a clean deck. If re-roofing, you have two options. First, you can pull back the shingles to get to the existing substrate, which is a costly effort. Consequently, the most feasible option might be to use fiber board to fill open spaces between the purlins. This process is less time consuming and thus less costly. However, rigid insulation such as fiber board should not be used on the entire roof or as a material on which to fasten roofing materials.

Metal panels are to be screwed directly into the purlins. Use your judgment to determine spacing per your geographic location, weather conditions and of course your local building codes. Other issues such as the roof height and slope should also be considered. Additional screws and fasteners should be installed around eaves, ridges, hips and gables as they are more susceptible to wind uplift. Finally, it is suggested to use sealing sidelaps as well as endlaps with butyl or butyls sealing tape to ensure a strong weather seal. And for added warmth, noise reduction and protection against condensation, you can install additional insulation in the spaces between your 2” x 4”s. This insulation should meet the standards for proper thickness, R-value and provide a good vapor barrier while not being too thick or bulky as that can cause the metal roof to fit improperly.

If looking for a roof with a longer life span, aluminum is your best option. It is also resistant against problems like acid rain and corrosion. And finally, it is the only roofing material that was able to stand up against salt water exposure in an ocean environment. Some good choices for aluminum roofing include the Grandrib 3, Grandrib 3 Plus, Alutuff or Alutuff II metal panels. Standing seam metal roofs will also work but do not fit most household budgets.

Metal Roof Upslope SpacingTypical Wind Speeds and Load Ranges

  • 80 MPH – 14.7 to 21.3 PSF
  • 90 MPH – 18.7 to 27 PSF
  • 100 MPH – 23 to 33.3 PSF
  • 110 MPH – 27.9 to 40.3 PSF
  • 120 MPH – 33.2 to 48 PSF

PSF = Pounds per Square Foot

Load Spans for 29 Gauge Grand Rib 3

Substrate Fastener 9 inch 12 inch 15 inch 18 inch 21 inch 24 inch
3/4″ plywood #9 x 1″ Woodfast NR NR NR NR NR NR
3/4″ plywood #14 x 1″ MP 275.6 206.7 165.4 137.8 118.1 103.4
5/8″ plywood #9 x 1″ Woodfast NR NR NR NR NR NR
5/8″ plywood #14 x 1″ MP 160 120 96 80 68.6 60
1/2″ plywood #9 x 1″ Woodfast NR NR NR NR NR NR
1/2″ plywood  #14 x 1″ MP  135.9  101.9  81.5  67.9  58.2  51.0
23/32″ OSB #9 x 1″ Woodfast NR NR NR NR NR NR
23/32″ OSB  #14 x 1″ MP  115.9  86.9  69.5  57.9  49.7  43.5
19/32″ OSB #9 x 1″ Woodfast NR NR NR NR NR NR
19/32″ OSB  #14 x 1″ MP  100.7  75.5  60.4  50.3  43.1  37.8
7/16″ OSB #9 x 1″ Woodfast NR NR NR NR NR NR
7/16″ OSB  #14 x 1″ MP  61.5  46.1  36.9  30.7  26.3  23.1
 Solid 2x SPF  #9 x 1″ Woodfast  218.7  164.0  131.2  109.3  93.7  82.0
 Solid 2x SPF  #14 x 1″ MP  293.3  220.0  176.0  146.7  125.7  110.0
 Solid 1x Pine  #9 x 1″ Woodfast  168.4  126.3  101.0  84.2  72.2  63.2
 Solid 1x Pine  #14 x 1″ MP  207.1  155.3  124.2  103.5 88.7  77.7
 Screws per Square  190  150  120  100  90  80

Please call us toll-free at 1-877-833-3237
with any questions or quote needs! We are here to help.

Customer service and pricing available from 8:00 am to 5:00 pm Arizona time Monday – Friday.

Just want online pricing? Click here to get instant online pricing.

Metal Roofing
Reroofing and the Metal Roof
#roof #roofing #repair_roofing

75 thoughts on “Reroofing and the Metal Roof

  1. You have very nice web with great post, wheres the donate button?

  2. Lucky i bumped to your site, i got all information i need here,.. great post

  3. When i look for information i need on google, your post is on first rank in page 1,.. its awesome!

  4. I really amazed with your blog, where is the donate button?

  5. Your post really informative, good job!

  6. Your explanation and tips is very inspiring, thanks buddy…

  7. Your web is very helpful, thank you

  8. You might have not necessarily intended to do this, but I do think you’ve managed to communicate the particular perspective large amounts of individuals are throughout. The particular sense associated with needing to guide, but not focusing on how or even wherever, is anything a lot of us are getting via.

  9. There are a lot of Apps that are designed to help you lose those extra pounds. Article Source: a Nutrition Coach Liz Copeland shows people who find healthy eating difficult how to change their beliefs and behaviours around food so they can eat well, look good and feel great. A variety of antiparasitic drugs, such as medendazole, are used to treat these infections.

  10. I’m not sure where you’re getting your info, but good topic. I needs to spend some time learning more or understanding more. Thanks for fantastic info I was looking for this info for my mission.

  11. Lead generation refers to the generation of prospective customer. Big corporations usually have a human resource department that specializes in meeting and anticipating these needs as well as staffing the organization. Basically, clipping path is a process where superfluous areas of an image are cut off.

  12. Thank you, I have recently been looking for information about this topic for ages and yours is the greatest I’ve came upon so far. But, what in regards to the conclusion? Are you positive concerning the supply?

  13. Hello would you mind stating which blog platform you’re using?I’m looking to start my own blog in the near future but I’m having a hard time choosing between BlogEngine/Wordpress/B2evolution and Drupal. The reason I ask is because your design and style seems different then most blogs and I’m looking for something unique. P.S My apologies for getting off-topic but I had to ask!

  14. I do not leave a response, but I browsed a few of the remarks here Chabot College.

  15. Hello to all, how is all, I think every one is getting more from this website, and your views are pleasant in favor of new viewers.

  16. Write more, thats all I have to say. Literally, it seems as though you relied on the video to make your point. You definitely know what youre talking about, why throw away your intelligence on just posting videos to your blog when you could be giving us something informative to read?

  17. I very like your post, informative!!.. keep it up!

  18. Oh my goodness! a fantastic write-up dude. Thanks a lot However We’re experiencing issue with ur rss . Do not know why Struggling to register for it. Could there be any person getting identical rss dilemma? Anyone who knows kindly respond. Thnkx

  19. Thanks , I have recently been searching for information approximately this topic for ages and yours is the greatest I have came upon till now. However, what about the bottom line? Are you positive about the source?

  20. Hey there this is somewhat of off topic but I was wondering if blogs use WYSIWYG editors or if you have to manually code with HTML. I’m starting a blog soon but have no coding knowledge so I wanted to get advice from someone with experience. Any help would be enormously appreciated!

  21. Nevertheless, from finding financing to locating the right inspector, there’s so much more at Amalfi to feel and experience.People will have lower rates and good deals are available at riad marrakech iodine La Mamounia for something around $250 a night per person, per night. If the walls are hand-decorated, the latest technology in communication, booking for your reservation in any luxurious hotels in the surroundings. Cheap holiday deals to Morocco. If you planning on an adventure trip to Morocco carefully will help make your vacations with family and friends.My webpage thekonnectshun.com (Tanisha)

  22. I have to voice my admiration for your kindness for people that need help with in this topic. Your special dedication to passing the solution throughout appeared to be exceedingly interesting and has consistently empowered people much like me to achieve their goals. Your own invaluable tips and hints entails this much to me and somewhat more to my office colleagues. With thanks; from everyone of us.

  23. Its such as you read my mind! You appear to grasp so much about this, such as you wrote the guide in it or something. I feel that you could do with a few percent to force the message house a little bit, but instead of that, this is magnificent blog. A fantastic read. I will certainly be back.

  24. Hey there! I know this is kinda off topic however I’d figured I’d ask. Would you be interested in trading links or maybe guest writing a blog article or vice-versa? My blog goes over a lot of the same subjects as yours and I feel we could greatly benefit from each other. If you might be interested feel free to shoot me an email. I look forward to hearing from you! Fantastic blog by the way!

  25. Excellent blog you have got here.. It’s difficult to find high quality writing like yours nowadays. I truly appreciate individuals like you! Take care!!

  26. I used to be able to find good info from your blog posts.

  27. This iformation is priceless. How can I find out more?

  28. Hiya very nice web site!! Guy .. Beautiful .. Superb ..

  29. we came across a cool website that you just might take pleasure in. Take a search in the event you want

  30. Im obliged for the article.Really thank you!

  31. If you desire to take much from this article then you have to apply these methods to your won website.

  32. Not to interrupt this thread, but, I’d like to find Drug Addiction Treatment Center and I don’t know one nearest me… do you have any info on this addiction treatment center? They’re address is in Los Angeles, close to my house I can’t find comments or reviews on them Los Angeles Drug Rehab, 601 S Figueroa St #4050, Los Angeles, CA 90017 (213) 634-4424

  33. Do you accepting paid guest post in this blog? contact me by email if you do

  34. Thanks for every other informative site. Where else may I get that type of info written in such a perfect method? I’ve a undertaking that I’m just now working on, and I have been on the look out for such information.

  35. Hi there! I know this is somewhat off topic but I was wondering if you knew where I could locate a captcha plugin for my comment form? I’m using the same blog platform as yours and I’m having difficulty finding one? Thanks a lot!

  36. Your blog is very helpful, informative

  37. Awesome read. I just passed this onto a buddy who was doing a little research on that. He just bought me lunch since I found it for him! Therefore let me rephrase: Thanks for lunch!

  38. For hottest information you have to pay a quick viksit internet and on internet I found this web site as a most excellent website for most recent updates.

  39. Really helpful blog, Thanks

  40. This unique blog is obviously awesome and diverting. I have chosen helluva handy advices out of this blog. I’d love to return again and again. Thanks a bunch!

  41. My spouse and i has been extremely motivated to find this site. I desired to help thank you just for this exclusive examine. When i definitely savored every little this and also We have anyone added to think about fresh things you submit.

  42. I want it easy to change template colors; a gallery area; calendar and of course the blogging area should be easy to manage/update. Names and links would be greatly appreciated..

  43. I have went to the My Account page and edit my blog tab, but there is no button for me to upload one and it won’t let me click the thumbnail. It’s very aggravating…what should I do?.

  44. I really enjoy reading your post, really helpful!

  45. I truly appreciate this post. I have been looking all over for this! Thank goodness I found it on Bing. You’ve made my day! Thank you again

  46. Great blog right here! Additionally your website loads up very fast! What host are you using? Can I get your affiliate link in your host?I want my website loaded up as fast as yours lol

  47. Can i write 1 guestpost for your web? it will be original, unique and informative article

  48. Hey I am so happy I found your blog, I really found you by mistake, while I was browsing on Google for something else, Nonetheless I am here now and would just like to say cheers for a fantastic post and a all round entertaining blog (I also love the theme/design), I don’t have time to read it all at the minute but I have saved it and also added your RSS feeds, so when I have time I will be back to read a great deal more, Please do keep up the awesome work.

  49. I have been browsing online more than three hours today, yet I never found any interesting article like yours. It’s pretty worth enough for me. In my view, if all website owners and bloggers made good content as you did, the net will be a lot more useful than ever before.

  50. I have been checking out a few of your articles and it’s pretty nice stuff. I will definitely bookmark your site.

  51. fantastic points altogether, you simply gained a new reader. What may you recommend about your post that you just made some days in the past? Any positive?

  52. Your blogreally amaze me, full of informative post here

  53. Yahoo lead me to your awesome blog, good job!

  54. Hello this is kind of of off topic but I was wondering if blogs use WYSIWYG editors or if you have to manually code with HTML. I’m starting a blog soon but have no coding experience so I wanted to get guidance from someone with experience. Any help would be greatly appreciated!

  55. Roof installation is usually a considerable investment, so you always have to be careful with your commercial roofing or residential roofing requirements. And then termites were found in the walls when work began on the central air-conditioning.

  56. I cant wait my blog growing bigger like your blog, awesome!

  57. I really want to thank you for yet another great informative post, I’m a loyal visitor to this blog and I can’t say how much valuable tips I’ve learned from reading your content. I really appreciate all the hard work you put into this great blog.

  58. This post gives clear idea designed for the new visitors of blogging, that actually how to do blogging.

  59. I know this if off topic but I’m looking into starting my own blog and was curious what all is required to get set up? I’m assuming having a blog like yours would cost a pretty penny? I’m not very web smart so I’m not 100% sure. Any recommendations or advice would be greatly appreciated. Appreciate it

  60. I certainly enjoyed the method that you explore your experience and perception of the area of interest

  61. Thanks for the strategies you are discussing on this weblog. Another thing I want to say is getting hold of copies of your credit history in order to inspect accuracy of any detail could be the first motion you have to perform in fixing credit. You are looking to clean your credit file from dangerous details problems that mess up your credit score.

  62. Together all along with all which seems that they are building within this exacting matter matter, a extensive percentage regarding details of view are generally preferably radical. But, I appologize, excluding My partner and i can of course not subscribe for your whole aura, every one whether it is refreshing doubtless not any the fewer. It looks to ensue able to everybody that your distinct opinions are generally not unavoidably completely rationalized along with in information an individual are typically your do-it-yourself not perfectly undeniable linking your point. All the rage about one happening Worn to achieve be thankful for evaluation the item.

  63. Together all along with all which seems that they are building within this exacting matter matter, a extensive percentage regarding details of view are generally preferably radical. But, I appologize, excluding My partner and i can of course not subscribe for your whole aura, every one whether it is refreshing doubtless not any the fewer. It looks to ensue able to everybody that your distinct opinions are generally not unavoidably completely rationalized along with in information an individual are typically your do-it-yourself not perfectly undeniable linking your point. All the rage about one happening Worn to achieve be thankful for evaluation the item.

  64. Thank you a bunch for sharing this with all folks you really recognize what you are talking approximately! Bookmarked. Kindly also seek advice from my web site =). We may have a link exchange agreement among us

  65. I’m very happy to read this. This is the kind of manual that needs to be given and not the accidental misinformation that is at the other blogs. Appreciate your sharing this best doc.

  66. Thanks for finally talking about > cfl | Sharpe Funeral Home, Inc. | Obituaries

  67. Hey there! Would you mind if I share your blog with my facebook group? There’s a lot of folks that I think would really enjoy your content. Please let me know. Thank you

  68. Great tremendous issues here. I am very happy to see your article. Thanks a lot and i am having a look ahead to touch you. Will you kindly drop me a e-mail?

  69. I very like your information, thank you 🙂

  70. Thanks for sharing this information for free!!

  71. I started new blog exactly same niche with your blog, can i publish some paid guestpost here? contact me by my mail if you accept it

  72. Hello mate, may i post this article on my site i will include link to source ofcourse.

  73. I really enjoy reading your post, full of information.. Thanks!!!

  74. Hello admin, I have some good offers for paid advertiser on your blog, please contact me 🙂

Leave a Reply

Your email address will not be published.