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  1. #1
    jonathanteller's Avatar
    jonathanteller Guest

    Default Asphalt shingles over wood shingles?

    Hi, I have a roof with wood shingles as a base layer, then half inch plywood over these shingles, then asphalt shingles over the plywood.
    I would like to simply tear off the asphalt shingles and reshingle with new asphalt shingles on top of the plywood.
    Is this an acceptable construction?
    Does the plywood count as a layer? or would this be considered only two layers (wood shingle and asphalt shingle)?
    I would save a lot of work an expense If I could avoid a complete tear off back to the 1" x 4" wood batterns.

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  2. #2
    Join Date
    Feb 2009
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    Southern Vancouver Island
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    Default Re: Asphalt shingles over wood shingles?

    Quote Originally Posted by jonathanteller View Post
    Hi, I have a roof with wood shingles as a base layer, then half inch plywood over these shingles, then asphalt shingles over the plywood.
    I would like to simply tear off the asphalt shingles and reshingle with new asphalt shingles on top of the plywood.
    Is this an acceptable construction?
    Does the plywood count as a layer? or would this be considered only two layers (wood shingle and asphalt shingle)?
    I would save a lot of work and expense If I could avoid a complete tear off back to the 1" x 4" wood batterns.
    I believe you can do that and it would be considered two layers. The plywood is sheathing, not a roofing layer.

    However. I recommend you bite the bullet and tear off to the strapping. It will make a better roof for minimal extra cost and a day or two of extra work. If there are rotten sections such as in the valleys of the original roof shingles, you will be cleaning that up. You will reduce the weight on the structure. The new sheathing will be fastened firmly to the strapping without the old water-soaked roof layer in between. You may be able to reuse a lot of the plywood so it won't cost much more to do a better job, and raise the value of the house as well.
    All those cedar shingles in the attic are a fire hazard as well. Get rid of them.

    John Kogel, RHI, BC HI Lic #47455
    www.allsafehome.ca

  3. #3
    Join Date
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    Connecticut
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    Default Re: Asphalt shingles over wood shingles?

    Do yourself a favor and do it right, sleep well, and add value to the home.
    By adding on top as was done before you are putting yourself into the stupid homeowner category and there are severe fines for that!!


  4. #4
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    Jul 2010
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    Northern, Ca.
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    Default Re: Asphalt shingles over wood shingles?

    I agree. Do it right this time, your home will be better and be worth more (some day)


  5. #5
    Phil Brody's Avatar
    Phil Brody Guest

    Default Re: Asphalt shingles over wood shingles?

    Additionally, if you strip it and secure it to current code and have a wind mitigation survey done you can save some real $$ on your insurance !


  6. #6
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    Sep 2009
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    leonardo, new jersey
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    Default Re: Asphalt shingles over wood shingles?

    Thats not to code here in New Jersey and I so can't imagine Tampa wind design criteria's accepting that. All fastening tables specify "to framing"

    How and what would they have that plywood fastened every with. A #8 rosin coated nail going through a 1/2" layer of plywood, then the lapping of the shakes may be 1/2" thick with a minimum 3/4" thick slat installed perpendicular to the rafter leaves barely a 1/2" of fastener into the already dry timber.

    Joseph Ehrhardt
    Building Forensic Specialist LLC

  7. #7
    Phil Brody's Avatar
    Phil Brody Guest

    Default Re: Asphalt shingles over wood shingles?

    I'm describing stripping to the rafters then securing and strapping to current code. True it's more work but the insurance savings could make it very attractive to do right in addition to some piece of mind if a storm comes.


  8. #8

    Default Re: Asphalt shingles over wood shingles?

    Quote Originally Posted by jonathanteller View Post
    Hi, I have a roof with wood shingles as a base layer, then half inch plywood over these shingles, then asphalt shingles over the plywood.
    I would like to simply tear off the asphalt shingles and reshingle with new asphalt shingles on top of the plywood.
    Is this an acceptable construction?
    Does the plywood count as a layer? or would this be considered only two layers (wood shingle and asphalt shingle)?
    I would save a lot of work an expense If I could avoid a complete tear off back to the 1" x 4" wood batterns.
    It's a technicality to count "layers". The concept, among others, is roof loading.
    the roof framing is designed to carry a certain dead load, the shingles do count!

    True Professionals, Inc. Property Consultant
    877-466-8504

  9. #9
    Join Date
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    Philadelphia PA
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    Default Re: Asphalt shingles over wood shingles?

    Along with all the other reasons to "do it right", not doing so might void the warranty on the new shingles.

    "There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
    www.ArnoldHomeInspections.com

  10. #10
    Ron Bibler's Avatar
    Ron Bibler Guest

    Default Re: Asphalt shingles over wood shingles?

    Wood shingles new air If you install a composition over the wood shingle what you will have is a mess in a few years...

    Remove all of the old materials and install to the Manufactures spect...

    Best

    Ron


  11. #11
    mark tyson's Avatar
    mark tyson Guest

    Default Re: Asphalt shingles over wood shingles?

    Quote Originally Posted by jonathanteller View Post
    Hi, I have a roof with wood shingles as a base layer, then half inch plywood over these shingles, then asphalt shingles over the plywood.
    I would like to simply tear off the asphalt shingles and reshingle with new asphalt shingles on top of the plywood.
    Is this an acceptable construction?
    Does the plywood count as a layer? or would this be considered only two layers (wood shingle and asphalt shingle)?
    I would save a lot of work an expense If I could avoid a complete tear off back to the 1" x 4" wood batterns.
    It will most likely be a mote point. All re-roofing must meet the requirements of the current Florida Building Code (permit required). Assuming the original shake/shingle roof is installed over wood battens the roof sheathing will not be able to be nailed to meet the minimum requirement for spacing. If the original roof is installed over a solid roof you could then nail the roof off to meet the requirements but will probably need to retain an engineer to specify the means of attachment and to perform loading calculations


  12. #12
    jonathanteller's Avatar
    jonathanteller Guest

    Default Re: Asphalt shingles over wood shingles?

    Ok ,Ok I get it! Thanks for all the advice!


  13. #13
    Join Date
    Mar 2007
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    Connecticut
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    Default Re: Asphalt shingles over wood shingles?

    Also, call your local fire department and ask them why you should have no more than 2 layers and definately not what you have now.


  14. #14

    Default Re: Asphalt shingles over wood shingles?

    "If you don't have the time to do it right... when will you have the time to do it over?" These guys are right. Take a little extra time and money now to do it right!

    Andrew Constantine
    InspectPro Home Inspections
    Charlotte NC Home Inspections
    Charlotte Home Inspections


  15. #15
    Join Date
    Mar 2007
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    Greenville, N.C.
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    Default Re: Asphalt shingles over wood shingles?

    Plus that's a lot of extra weight on your framing.
    Did you need to calculate the loading?

    JLMathis


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