Who Is Still Using Felt?

J-Peffer

From what I understand felt or underlayment was orginally used simply as a way to "dry" a roof in and eventually became part of the roofing system.

No.15 felt will not keep much water from penetrating a roof deck, but if a little does get through the shingles, it will prevent it.

Honestly any area that there is a chance of ice or water getting through because of wind driven rain, or ice build up should really have something more than no.15 or 30 felt.

Most code will let you double No.30 instead of ice and water even.

Out in the open roof, with just water treading, honestly....felt is probably just a precaution and not necassary.

Code or not though, I'd recommend it and I'm sure a customer would be wondering why felt is NOT being used because it's just considered part of the roofing system. Code is BARE minimum requirements, they have code approved houses called "modular" homes that are just awful, yet code approved too.

Warren

Maybe we install it because shingles are not waterproof.

jstange2

We use the new synthetic underlayments and I have see this on the gaf shingles also.

davitk

They're NOT?? OMG we've been getting lied to all these years.

Next thing you know we'll find out step shingles are not necessary, another one of those redundancies an engineer dreamed up.

Inmate 369

felt or underlayment is not required by manufactors or code but if not used over time your shingles will stick to your sheething and show terrible and any buckling in your becking will tear your shingles. Good Luck

mics_54

my code book (2006 IRC) says it is.

(codes in your area may be different)

Maine

Thanks for the info. I talked with a GC in my neighborhood last night, he confirmed that they are now not using much felt in my area, however, it is a horrible idea.

So felt it is, thanks for the info guys.

Inmate 369

Don't get me wrong codes very expecialy when it comes to snow loads (which i know nothing about ) .I ALWAYS use felt paper.

PA woodbutcher

So why does the GFCI need to be the first outlet in the circuit in order to work? You show up here busting everyones balls like it's your party. They try to give you an answer and you want more. Go ahead and knock yourself out and install your roof and save 5 bucks a square I wouldn't. A good underlayment is the cheapest insurace your going to get.

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Tinstaafl

It doesn't.

WarnerConstInc.

The REAL question is, Who does not use felt.






cheapskate's

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Warren

We don't use felt all the time. We like to use the synthetics like Titanium UDL. Its lighter and tearproof. Not to mention, when its 10 degrees out, felt gets soooo brittle. It does cost about 3 times as much though, but thats for the GC to worry about.

NNY

We use the felt and Ice and water where needed . We don't get callbacks . That's worth the expense itself . In a perfect world the shingles get the job done . In the contracting world anything can happen and if slapping down some felt can maybe stop a whole host of nightmares from a "little" leak , slap that stuff down . Also , I just can't imagine a homeowner letting you slide on not putting in down .

davitk

OK this is not a roof but fits the "Felt? We don' need no stinkin' felt!!" catagory. Dumbasses.

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NNY

There you go . You actually see more damage on sidewalls from improper installs . Looks like quite a patch job on the ply .

Red Adobe

I saw a mesican once felt over shingles then do another layer, I think it was the 4th layer

t's cheap and takes what 30 mins to do 10 sq, I do metal and use radiiant barrier but its basicly the same cheap n easy and make the cusomer happy

roofbutcher

In some areas it’s code, and some shingle manufacturers’ use it as an excuse to not honor their warrantees.


From a craftsmanship perspective, I like it on old, rough deck to protect the back-side of the shingle from stubble. I have also seen it trap water against plywood and blow it apart. Being confident in my shingling, I prefer not to use it on clean, smooth plywood.

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MacRoadie

Underlayment is required in any area where the IRC has been adopted as the model code. There may be some semantic issue regarding "felt" versus "underlayment" as a lot of areas don't use asphalt impregnated felt anymore.

davitk

ROFLMAO

Maine

I didnt know I was "busting anyones balls", I was simply trying to learn the pros and cons to using felt, is education a problem for you?

If you would have taken the time to read, you would have seen that I did install the felt.