The "felt" is a layer of asphalt. The thicker, generally, the better.
But a lot depends on where you live, what the climate it, etc.
Northern New England has different challenges than southern New England
and Florida and Arizona are entirely different beasts.
(though I imagine there's lots of scrap felt to be found in Florida today).
The black asphalt felt has been used for years. It does NOT rot.
They are just trying to make money off of you.
On 14 Aug 2004 19:48:33 -0700, email@example.com (Tom Baker) wrote:
He may be referring to fiberglass, as opposed to "rag" reinforced felt
underlayment. Best reference: go to Google, and search "purpose of roofing
paper" , inside quotes. In that 2002 thread there is a good summary letter
of the advantages/downfalls of glass reinforced felt. Read the whole
Never heard of "non-rot felt".
Felt comes in #15 and #30 which basically means one is thicker than
the other (weight has nothing to do with it). #15 is thin like tissue
paper and can be ripped easily--you can't use it on a steep roof
because the roofers will tear it during installation. #30 is what
should be used.
There are a lot of new "underlayment" products on the market but none
of which are worth the extra money for a regular roofing installation,
IMO. Felt only serves two purposes: it protects the roof before the
shingles are installed and it acts as secondary leak protection if
there is a "blow-off" of shingles. Otherwise, it doesn't do anything.
In fact, most shingle manufacturers only recommend the installation of
felt, they don't require it for the installation of their shingles.
Could also be the stuff called "Tri-Flex 30" from Flexia of Canada.
I picked up a sample at a local home show a few months ago.
Impossible for me to rip with bare hands.
The blurb printed on the material says:
"Proven for 20 years"
"Won't wrinkle, rot, crack or dry out like felt."
"Won''t rip or tear away from nails"
"8 times lighter than 30lb felt"
"Leave exposed for up to 6 months before applying the finished
"Meets all national building codes. Now MiamiDade accepted."
I haven't used it, so I can't share any firsthand experience.
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