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Installing Shingles Without Any Underlayment

 
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Old 11-04-2016, 10:29 AM   #1
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Installing Shingles Without Any Underlayment


Have seen many many pics (in other forums) of Canadian roofers putting shingles on with no underlayment other than I+W on the eaves and valleys. They swear it's code compliant. But every set of manufacturers instructions I've seen seen shows underlayment is needed for the material warranty. Can any Canadians explain this please?

Last edited by roofermann; 11-04-2016 at 10:30 AM. Reason: clarity
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Old 11-04-2016, 10:41 AM   #2
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Re: Installing Shingles Without Any Underlayment


Does IRC cover builders code in Canada?

IBC R905.1.1 has an entire table based on the roof covering and pitch as well as the correct underlayment.

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Old 11-04-2016, 02:39 PM   #3
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Re: Installing Shingles Without Any Underlayment


We follow the National Building Code and each Province (State) has its own Building code as well.
Don't know if it is code or not, but I place some sort of membrane down under shingles or metal roof. At least black building paper if not the heavier felt.
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Old 11-04-2016, 04:15 PM   #4
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Re: Installing Shingles Without Any Underlayment


Very common when using zip sheathing.
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Old 11-04-2016, 04:56 PM   #5
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Re: Installing Shingles Without Any Underlayment


Quote:
Originally Posted by CharlieDelta View Post
Does IRC cover builders code in Canada?

IBC R905.1.1 has an entire table based on the roof covering and pitch as well as the correct underlayment.
Does make one wonder what the "International" stands for in International Residential Code (IRC)/IBC.
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Old 11-05-2016, 02:43 PM   #6
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Re: Installing Shingles Without Any Underlayment


In my experience trying to get a manufactures warranty is like herding cats.

As for it being code compliant you don't need it but any roofer worth his reputation uses it because it's a good idea.
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Old 11-05-2016, 04:55 PM   #7
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Re: Installing Shingles Without Any Underlayment


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Originally Posted by SmallTownGuy View Post
Does make one wonder what the "International" stands for in International Residential Code (IRC)/IBC.
It might be that the National Code we use is based on IRC, but I don't have any indication that it is so.
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Old 11-05-2016, 08:41 PM   #8
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Re: Installing Shingles Without Any Underlayment


Not required in Ontario, sort of. We have to bring a minimum of #30 12" past the inside wall, but only below 8/12 pitch.
They make different wrappers for us, only recomending its use.
Pretty common to paper everything these days, except in new work where its still pretty rare.
New work pays very well here, but not well enough for me to paper em on my dime.
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Old 11-05-2016, 11:40 PM   #9
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Re: Installing Shingles Without Any Underlayment


I agree roofermann but then again I still know of guys who hand write their time cards
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Old 11-08-2016, 07:19 PM   #10
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Re: Installing Shingles Without Any Underlayment


I know we all put on underlayment but you have to admit it is like wearing two pair of underpants or as they used to say suspenders and a belt. I tight roof is not going to leak and the underlayment is superfluous. When it does start leaking the underlayment is going to save you for a little while until the shingles just plain fail, I suppose.

I always put on underlayment 'cause I don't want to go commando.

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Old 11-08-2016, 08:00 PM   #11
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Re: Installing Shingles Without Any Underlayment


Always see underlayment put on here in Alberta.
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Old 11-30-2016, 09:34 AM   #12
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Re: Installing Shingles Without Any Underlayment


Underlayments are required as a moisture management as well. I guess you could technically get away with it, but when the shingle blows off, that underlayment is all that is saving the sheathing from getting wet.
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Old 12-07-2016, 10:58 AM   #13
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Re: Installing Shingles Without Any Underlayment


wow i can't believe they don't add an underlayment. We use synthetic for all of our roofs and im wondering how they manage in the winter with all the snow. Can't imagine the calls they probably get for leaks, maybe its a scheme to get more business lol.

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