by Tony B in Brampton 12 months ago
I am attempting a DIY on some manufactured stone veneer on the front of my house. I am assuming this is almost the same process as stucco (until after the scratch coat).
In the install manual for the manufactured stone I purchased (which is american), they suggest I use a two ply Grade ‘D’ 60 minute paper as WRB. I have done some research on the internet and see that is more popular out west. I am in Ontario and would prefer to follow the manufacturers directions. They also suggest I install a J weep 4" above grade.
My question, where can I purchase about 100 sq. ft of this Grade D felt paper, and because I am having the windows replaced should I be looking into a weep system like this (http://www.mtidry.com/hyperspecs/hyperspec.php… ?
Any help would be appreciated. Its a rather small project, and the quotes I have been getting to install this are a little over the top. I just need a little nudge in the right direction, and I know I can get this done properly myself.
3 Responses
by Egbert from Diamond Home Inspection 12 months ago
Here is a great littel reference on some of the best practices for Concrete Masonry Veneer: http://www.culturedstone.com/literature/docs/I….
Remember, the stone, grouting and mortar are all porous. Expect water to penetrate and that the paper will be providing the water barrier. And all the flashings, including those around the window, are designed to direct water from the paper to the face of the stone, if the joints between stone and flashing below it are solid, the water can’t get out easily.
I do strongly encourage you to replace the windows before completing the stone, preferably before even starting. The WRB is a system and its very difficult, if at all posssible, to pre-install the paper and flashings in such a way that the window can be added later without removing stone.
Stucco and therefore mortar for the stone will often stick to, or evenpenetrate house wrap products; this can reduce its effectiveness to near zero. It may stick to the top layer of paper, but that is why you should use two. Its available at the big box stores.
Best of luck and try to think like water. :-D
by Tony B in Brampton 12 months ago
Thanks for the advice, I was planning on waiting until the windows were installed.
I still have one more question, I am planning on using the 3.4 Ib sq/yd wire lath, with 1/2" of scratch.
Maybe I am over worrying about the house wrap portion of this, but canyon stone suggests I use a two lay WRB such as a two
ply Grade D 60 minute paper. I purchased my materials from stone selex and they are telling me the #15 that you can buy from home depot is what they use. From the research i have done, I can see that that the ‘D’ 60 minute paper is more available in the USA. Is the #15 pretty much the same thing? Or should I be looking to specially buy what the manufacturer suggests.. and if so.. where can I purchase it in the toronto area?
Thanks so much,
Tony
by Egbert from Diamond Home Inspection 12 months ago
Grade D and 15# are different grading systems for slightly different products, though that difference is usually lost on retailers, and they usually carry a cheaper lighter unrated product. Unless the local building code officers are doing their job, contractors haven’t bothered to insist on the right products.
This link is pretty comprehensive description, http://www.greenbuildingadvisor.com/blogs/dept….
If you want an overly technical (and CDN) study, read this: http://www.nrc-cnrc.gc.ca/obj/irc/doc/pubs/nrc….
My summary: Properly rated 30# felt is by far the best (thickest, longest lasting, least permeable) and exceeds the 60min paper the manufacturer recommends. As for shoppinging in Toronto – I’ll be visiting for the first time in a few month. But Googling Toronto Roofing Suppliers came up with a few companies, all of whom listed 30# felt on their product list.
Good luck!