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KWROOF 08-28-2006 06:00 PM

Roof Underlayment?
I am always interested in finding out what other people believe in when it comes to sharing best practices.

I have never heard that Ice & Water shield is a bad thing for a roof above eaves, in valleys, around roof penetrations, etc or on 4/12 roofs or lower. However, the point of discussion I raise surrounds the requirement for felt.

To Felt or not to felt? That is the question.

I have an opinion on it of my own, but I would like to get some feedback, and hopefully from both sides of the coin.



ron schenker 08-28-2006 06:09 PM

I felt

Bonus 08-29-2006 01:37 AM

I put felt on all sloped roofs, 30# at the eave and 15# in the field. Is that what you're asking?

joasis 08-29-2006 07:34 AM

There are newer products out there, like tri-flex and similar, but we still use tried and proven felt. I am south of the ice and water shield zone, so roofing techniques farther north are different in a few ways then I have done.

RooferJim 08-29-2006 08:38 AM

You have to use felt, not only is it code "Massachusetts anyway" but its just about all manufactures specs. read the fine print
do it right


mattp 08-29-2006 05:40 PM

were does the snow and ice region start? I live in north missouri and have always used ice barrier, am I required to

handypilot 09-03-2006 07:18 PM

I would certainly felt! Like RooferJim said, if you don't, you could void the warrenty and/or bust code. Additionaly, some brands of arcitectual shingles require 30# over whole roof.

Code ussually requires at least 15# felt (or equivelant), and if the shingle manufacture requires 30# then that must be installed.

KWROOF 12-08-2006 09:18 AM

Thank you very much for your feedback. It is what I believed to be true.
Manufacturers, such as GAF and ELK say that it is not required for warranty for their Arch. Shingles here in Canada.

We use Ice & Water rather than felt up here for application on the valleys and above the eaves.

My question is more geared towards above the 3ft line above the eaves, and on steeper pitch roofs such as 8 12 or greater.

RooferJim 12-08-2006 03:59 PM

I wonder why GAF and ELK would require felt here but not up in Canada? strange.


Bonus 12-08-2006 07:32 PM

I haven't used GAF but have used Elk in the past, and as far as I remember the packages call for 30# and 15# in the field. Why wouldn't you put it down? It's cheap and fast, and if you do it carefully you can use it to make sure you're not 'fanning' the tiles as they go down.

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