Block-Aide Wall NP is a self-adhered vapor barrier comprised of a facer material, butyl adhesive, and a release liner. The facer material comprises of 2 coating layers and a woven scrim layer. The membrane is blue in color on the exposed side with a nominal weight of 15.93 lbs per 100 sq.ft. It is available in rolls of 36 inches wide and 75 feet long.
| CAN/ULC S741 |
Air Permeance @ 75 Pa – Infiltration
• Unconditioned
• Conditioned |
< 0.20 L/(s.m2)
< 0.20 L/(s.m2) |
Air Permeance @ 75 Pa – Exfiltration
• Unconditioned
• Conditioned |
< 0.20 L/(s.m2)
< 0.20 L/(s.m2) |
Water Vapor Permeance
• Unconditioned
• Conditioned |
0.019 perms
0.017 perms |
| CAN/ULC S742 |
| Opaque Wall – After Loading with Temperature Differential of – 20°C |
| Results |
Wall Construction |
Sustained Loading: 650 Pa
Cyclic Loading: 950 Pa
Gust Loading: 1410 Pa
Maximum air leakage < 0.20 L/(s.m2) @ 75 Pa, after loading sequence and temperature differential of – 20°C |
• 2x6, 18 gauge galvanized steel studs spaced 16 in. oc.
• ½ in. thick gypsum board sheathing
• Single coat of CCW-702LV liquid applied to gypsum
• A single layer of Block-Aide adhered to the liquid applied coat with 5 in. horizontal and 2 in. vertical overlaps at joints.
• BarriBond silicone sealant used at the joints
• For penetrated wall, Block-Aide is folded inward and sealed using BarriBond at the openings. |
