# Underlayment **URL:** \ **Category:** Misc. Discussion\ **Created:** [February 28, 2014, 11:54pm UTC](https://forum.nachi.org/t/underlayment/84886 "2014-02-28T23:54:20Z")\ **Posts on this page:** 15\ **Page:** 1
**Author:** ![gmcmillan](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/gmcmillan/32/175583_2.png) [@gmcmillan](https://forum.nachi.org/u/gmcmillan)\ **Post date:** [February 28, 2014, 11:54pm UTC](https://forum.nachi.org/t/underlayment/84886/1 "2014-02-28T23:54:20Z")
Has anyone seen this type of roof underlayment? It’s paper…Not felt paper, just paper. ![GEDC0026.JPG](https://global.discourse-cdn.com/internachi/original/3X/2/b/2b7ac5af1b933f987f1a4d2b9f58200afe729aec.jpeg) ![GEDC0026.JPG](https://global.discourse-cdn.com/internachi/original/3X/2/b/2b7ac5af1b933f987f1a4d2b9f58200afe729aec.jpeg) ---
**Author:** ![mauger](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/mauger/32/178937_2.png) [@mauger](https://forum.nachi.org/u/mauger)\ **Post date:** [February 28, 2014, 11:59pm UTC](https://forum.nachi.org/t/underlayment/84886/2 "2014-02-28T23:59:07Z")
never seen it up here. Is it wax coated or something to keep it water repellant? ---
**Author:** ![gmcmillan](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/gmcmillan/32/175583_2.png) [@gmcmillan](https://forum.nachi.org/u/gmcmillan)\ **Post date:** [March 1, 2014, 12:08am UTC](https://forum.nachi.org/t/underlayment/84886/3 "2014-03-01T00:08:04Z")
It’s just paper. It’s crazy. I’ve never seen anything like it. ---
**Author:** ![mcyr](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/mcyr/32/173319_2.png) [@mcyr](https://forum.nachi.org/u/mcyr)\ **Post date:** [March 1, 2014, 12:38am UTC](https://forum.nachi.org/t/underlayment/84886/4 "2014-03-01T00:38:27Z")
Looks like a Sisal Kraft Paper. Mostly used for wraping. There was a type of reinforced Sisal Kraft paper I used many years ago that was waterproof and laminated with asphalt layer in the middle. Used as a moisture barrier under concrete floors, but the one pictured is not that. 🙂 ---
**Author:** ![relliott](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/relliott/32/170884_2.png) [@relliott](https://forum.nachi.org/u/relliott)\ **Post date:** [March 1, 2014, 1:00am UTC](https://forum.nachi.org/t/underlayment/84886/5 "2014-03-01T01:00:23Z")
Looks like Red Rosin paper. Light weight asphalt between two layers of paper typically used as a moisture barrier under hardwood flooring (wood frame construction). Guess the homeowner saw “underlayment” and found the price too hard to resist. As a roofing material it’s not appropriate… ---
**Author:** ![btoye](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/btoye/32/58400_2.png) [@btoye](https://forum.nachi.org/u/btoye)\ **Post date:** [March 1, 2014, 1:06am UTC](https://forum.nachi.org/t/underlayment/84886/6 "2014-03-01T01:06:20Z")
Agreed, rosin paper. Usually used under interior wood flooring not shingles. ---
**Author:** ![mcyr](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/mcyr/32/173319_2.png) [@mcyr](https://forum.nachi.org/u/mcyr)\ **Post date:** [March 1, 2014, 1:06am UTC](https://forum.nachi.org/t/underlayment/84886/7 "2014-03-01T01:06:58Z")
> [@relliott](#): > > Looks like Red Rosin paper. Light weight asphalt between two layers of paper typically used as a moisture barrier under hardwood flooring (wood frame construction). Guess the homeowner saw “underlayment” and found the price too hard to resist. As a roofing material it’s not appropriate… Rick, red rosin paper is a paper used for underlayment flooring, used as a slip sheet under copper standing seam roofs, used under siding years ago as a wind barrier. Not a vapor barrier and does not haf an asphalt layer. [https://sp.yimg.com/ib/th?id=HN.608029466367036552&pid=15.1](https://sp.yimg.com/ib/th?id=HN.608029466367036552&pid=15.1) 🙂 ---
**Author:** ![kleonard](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/kleonard/32/170953_2.png) [@kleonard](https://forum.nachi.org/u/kleonard)\ **Post date:** [March 1, 2014, 1:31am UTC](https://forum.nachi.org/t/underlayment/84886/8 "2014-03-01T01:31:51Z")
Maybe… [http://www.national-lumber.com/products/opus\_roof\_blanket.htm](http://www.national-lumber.com/products/opus_roof_blanket.htm) ---
**Author:** ![mcyr](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/mcyr/32/173319_2.png) [@mcyr](https://forum.nachi.org/u/mcyr)\ **Post date:** [March 1, 2014, 1:39am UTC](https://forum.nachi.org/t/underlayment/84886/9 "2014-03-01T01:39:53Z")
Are you proposing that product as to a similarity to the OP’s question? Don’t resemble it at all. 🙂 ---
**Author:** ![btoye](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/btoye/32/58400_2.png) [@btoye](https://forum.nachi.org/u/btoye)\ **Post date:** [March 1, 2014, 1:56am UTC](https://forum.nachi.org/t/underlayment/84886/10 "2014-03-01T01:56:38Z")
“Rosin papers is frequently used as a layer between the roofing material and roofing felt. The rosin paper acts as a separation layer to prevent the roofing felt from sticking or bonding to any of the roof’s metal panes. Rosin paper is also used in roofing to act as a slip or drip sheet. The rosin paper stops any coal tar or asphalt from dripping into the interior of the roof or building.” Read more: [http://www.ehow.com/info\_8112706\_uses-rosin-paper.html#ixzz2ufjIZOua](http://www.ehow.com/info_8112706_uses-rosin-paper.html#ixzz2ufjIZOua) ---
**Author:** ![gneff](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/gneff/32/59427_2.png) [@gneff](https://forum.nachi.org/u/gneff)\ **Post date:** [March 1, 2014, 2:53am UTC](https://forum.nachi.org/t/underlayment/84886/11 "2014-03-01T02:53:06Z")
Can remember finding something similar under some old metal roofs. Been a long time though ---
**Author:** ![mauger](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/mauger/32/178937_2.png) [@mauger](https://forum.nachi.org/u/mauger)\ **Post date:** [March 1, 2014, 3:30am UTC](https://forum.nachi.org/t/underlayment/84886/12 "2014-03-01T03:30:09Z")
when you google brown paper underlayment there are products for several (not roofing) that are brown paper underlayment. ---
**Author:** ![gmcmillan](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/gmcmillan/32/175583_2.png) [@gmcmillan](https://forum.nachi.org/u/gmcmillan)\ **Post date:** [March 1, 2014, 3:51pm UTC](https://forum.nachi.org/t/underlayment/84886/13 "2014-03-01T15:51:41Z")
This paper was a single layer installed under the shingles on a mobile home built 2002 in southern Florida. It just seems to me to be an inferior product for this type of situation. ---
**Author:** ![rwelch](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/rwelch/32/858_2.png) [@rwelch](https://forum.nachi.org/u/rwelch)\ **Post date:** [March 1, 2014, 5:19pm UTC](https://forum.nachi.org/t/underlayment/84886/14 "2014-03-01T17:19:20Z")
> [@gmcmillan](#): > > This paper was a single layer installed under the shingles on a mobile home built 2002 in southern Florida. It just seems to me to be an inferior product for this type of situation. I was just about to ask if it was a mobile home. They’re built inside and don’t really need to have a “temporary” dry-in. So, the kraft paper really just serves as a moisture barrier. This is common on mobile homes. ---
**Author:** ![gmcmillan](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/gmcmillan/32/175583_2.png) [@gmcmillan](https://forum.nachi.org/u/gmcmillan)\ **Post date:** [March 3, 2014, 11:57am UTC](https://forum.nachi.org/t/underlayment/84886/15 "2014-03-03T11:57:29Z")
It was the only underlayment the home had. That’s what my concern was. Does not seem to be enough.