Stucco paper seems to be something that most people have a lot of questions about because there are so many terms associated with it like 10 minute, 60 minute, one ply, two ply, etc.
This is going to be more of a resource guide on what the differences are between the various stucco papers and which ones to use for what applications. This should clear up a lot of questions, if I present the information the right way, that is!
One Ply Versus Two Ply Paper:
There are two different rolls of paper that you can usually get and these are either a single ply or double ply paper. You can use either for stucco, providing that you meet the minimum code requirements.
Single Ply Stucco Paper: Single ply paper is usually not used a whole lot in the stucco industry because a double ply application will last much longer and is a much better option for a small additional cost.
There are certain codes that will allow you to use a single ply application of paper for stucco but typically this is a MINIMUM recommendation and not the best option.
If you do end up using a single ply of paper, you will usually use the thicker 60 minute paper, as the other (thinner) papers will not meet code requirements. Home Depot and Lowes will usually only carry single ply paper, from my personal experience.
You can use the single ply paper to achieve two plies but you will be working much harder than you would if you just used a roll that had two ply paper on it. You would be doing twice the work, essentially.
Two Ply Stucco Paper: Two ply paper is really the "industry standard" when it comes to stucco applications. The paper is sometimes tacked together in spots but can be separated if need be.
I have only been able to find two ply paper at my local stucco supply yard as it seems to be more of a specialty type of item that is not stocked in all hardware stores. You can find it at select Home Depot locations.
10 Minute Versus 60 Minute Stucco Paper:
Along with being able to choose from one ply or two ply stucco paper, you also have to choose a weight and these are usually signified in terms of minutes. The larger the number, the thicker the paper and the more water resistant it is.
Both the 10 min. and 60 min. paper is usually the "standard" at most material suppliers and Home Depot, Lowes, and local stucco suppliers will usually carry both types.
10 Minute Paper: 10 minute paper is the thinnest type of stucco paper used nowadays and is probably the easiest to use. It does tend to tear a little easier than a 60 minute paper so care must be taken when installing this paper.
60 Minute Paper: 60 minute paper is one of the thickest papers available and if using a two ply roll, it is very tear resistant and adds some serious water protection over a 10 minute paper.
Other Graded Papers:
It is important to note that there are options of paper weights that are available but these are typically more of a special order type of item. I do not know what the purpose of using these other papers would be other than simply bridging the gap between the 10 min. and 60 min. papers.
GMC paper is one brand that offers other weighted paper options. These are a 30 minute paper and a 60/30 minute paper (combination).
You can check out more information on GMC's website if your interested.
Can I Use Tyvek Instead?
You can use Tyvek or Tyvek's Stucco Wrap products on stucco applications but you should not replace the stucco paper with it. Instead, it can be used underneath the stucco paper as another moisture barrier instead, for added protection.
What Is Grade D Paper?
Grade D paper is basically just a simple term used to described an ashphalt saturated building paper, like the paper we are talking about. It does not specify whether it is one-ply or two-ply, it is just a standard description for a water resistant type of paper.
There is another product out there that has the paper and wire attached together and is commonly used for open stud applications, where there is no osb/plywood backing material to attach the stucco lath to.
The paper is a single ply paper (60 min) and is sewn together (in a sense) with a small diameter wire that is interwoven between the paper and the wire. I do want to note that I personally do not like this setup and believe that it is far more likely to develop leaks over a wall that has a plywood backing material installed and a two ply paper installed under the metal lath.