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Old 09-10-2014, 04:02 PM   #1
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30# vs 15# felt


Was a little mouse in the corner listening to convo between a younger and older guy. Older guy says ONLY use 30# felt when you reshingle.

I was under the impression 30# was for shakes and 15# is for composition shingles??

Does using 30# felt extend the life of the roof?? Whats the pluses and minus of using 30#??

Trying to help my son re-roof his house in a week or so and then have a few of my own to go yet. Had bad storm damage in the area this summer.

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Old 09-10-2014, 08:37 PM   #2
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30# vs 15# felt


I'm of the thought the underlayment isn't a huge concern when the shingles are installed immediately following the application of the underlayment.

With that said, we either use synthetic or 15# (mostly synthetic)

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Old 09-10-2014, 09:12 PM   #3
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30# vs 15# felt


Modern #15 is garbage, like newsprint that has been lightly sprayed with liquid asphalt. I won't get on a roof that has #15 for fear of it tearing out under my feet.
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Old 09-10-2014, 10:08 PM   #4
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30# vs 15# felt


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Modern #15 is garbage, like newsprint that has been lightly sprayed with liquid asphalt.
i just bought and installed(a every small amount) of 15#. its not like that at all.
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Old 09-11-2014, 06:58 AM   #5
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30# vs 15# felt


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i just bought and installed(a every small amount) of 15#. its not like that at all.
Brand name? All the suppliers around here carry garbage.
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Old 09-11-2014, 07:00 AM   #6
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30# vs 15# felt


When we use #15 we use Tamko. Not bad at all.
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Old 09-11-2014, 08:57 AM   #7
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30# vs 15# felt


Hey DIY type application I would always recommend synthetic.

The fact is that the job will not be done in a large production type manner and you're much more secure in the knowledge that the roof is dried in and you will not have any issues with this felt rippling if you go with a synthetic underlayment.
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Old 09-11-2014, 08:41 PM   #8
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30# vs 15# felt


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Originally Posted by Windows on Wash View Post
Hey DIY type application I would always recommend synthetic.

The fact is that the job will not be done in a large production type manner and you're much more secure in the knowledge that the roof is dried in and you will not have any issues with this felt rippling if you go with a synthetic underlayment.
+1, and if you go with a product like rhinoroof you can have that security without the premium cost.
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Old 09-11-2014, 09:45 PM   #9
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30# vs 15# felt


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Brand name? All the suppliers around here carry garbage.
i am not sure, didn't pay attention. but i did get it from manards, so it probably is this.
http://www.menards.com/main/building...74-c-13250.htm
now, i am sure, and i hope, this is not the best stuff. but it will suit my needs.
and i read real newspapers every day. and it is not nearly as thin and a newspaper.
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Old 09-12-2014, 12:02 PM   #10
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30# vs 15# felt


The problem is the ignorance regarding felt, and the devious selling methods used by the manufacturers Bean counters.

The only way to make sure you are actually getting real No. 15 is to make sure that it is ASTM D226 Type 1. And that is what you want under a shingle roof, as long as you do not let it get wet, because it is Organic, and it will swell.

Take a look at Tamko's web sight. The only "Real" no 15 is called No. 15 UL. Dig deep to specifications and you will see that it is the only ASTM D-226 Type 1 felt they have.

Now, tell me that they are not trying to be devious. A roll of real D226 Type 1 is about twice the diameter of their "shingle underlayment."

As a professional roofing consultant, I fought for years with these idiots to no avail. They could not understand how their dishonesty was wrecking the industry, and that their little tricks were soon to be discovered by other manufacturers that would follow suit.

I have had explosive arguments with roofers that have had to remove pallets of material from job site's that were already loaded with the wrong product, and the idiots hired by roofing supply houses say "Ahh its all the same stuff"

You really have to educate yourself in roofing, like any other trade, and it does not help when manufacturers play their continual game of financial one-upsmanship.

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