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  1. #1
    Join Date
    Jul 2013
    Posts
    8

    Default 15lb felt as underlayment for a small porch roof.... Good/Bad

    Or would a different product be better?

  2. #2
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    6,736

    Default Re: 15lb felt as underlayment for a small porch roof.... Good/Bad

    It will pass inspection. If you double the paper (to create 30lb) you'll get better protection for very little additional $.

  3. #3
    Join Date
    Aug 2007
    Posts
    7,195

    Default Re: 15lb felt as underlayment for a small porch roof.... Good/Bad

    Quote Originally Posted by dj1 View Post
    It will pass inspection. If you double the paper (to create 30lb) you'll get better protection for very little additional $.
    I would crapcan the 15# altogether and just go with 30#, it is easier to use, won't tear, or puncture like 15# does, providing a much better water barrier.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  4. #4
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,969

    Default Re: 15lb felt as underlayment for a small porch roof.... Good/Bad

    add one more vote for 30 pound

  5. #5
    Join Date
    Mar 2009
    Posts
    1,387

    Default Re: 15lb felt as underlayment for a small porch roof.... Good/Bad

    Howdy whats the pitch an what are you shingling over the felt? #15 and #30 are now about 7 an 15 pound felt. you can obtain 30 pound felt about $28 per roll . I prefer it as more saturated felt with asphalt the better . an the products for ice damming might serve you well- ice and water guard is one if the slope is slight it is more leak resistant.
    Any an all of my comments are just my opinion and not to be confused with facts.

  6. #6
    Join Date
    Jan 2008
    Posts
    2,203

    Default Re: 15lb felt as underlayment for a small porch roof.... Good/Bad

    I have totally given up on roofing felt and switched to synthetic roof underlayment on anything more important than a shed or doghouse. I's is vastly superior in every way compared to any weight of felt, and while it costs more, if applied correctly is going to be waterproof for the life of the house while felt will eventually harden and crack. Since it comes in wider rolls, there are fewer seams and thus fewer places where water can find it's way in, especially on lower-pitched roofs. The "Titanium" brand is what I use here but there are others now which seem to be just as good.

    I'm not a believer in many 'modern' super-products in construction but this one is just plain awesome.

    Phil

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