I have Selkirk Metalbestos and it's been up for 9 years without a problem.
I haven't had to use any other. I found the lowest price at my local hardware store. He undercut the online guys and let me store it in the back his barn actually) until I was ready to cut the hole in the roof.
I haven't had to use any other. I found the lowest price at my local hardware store. He undercut the online guys and let me store it in the back his barn actually) until I was ready to cut the hole in the roof.