Is the ZIP sheathing system good or bad for water control?

Trevor Prinz
Updated: Aug. 27, 2020

Do you have any experience with this system and know how it would compare to regular OSB sheathing with a fully adhered sheathing membrane?

Responses (5)

Trevor Prinz 4 years ago
Mike Reynolds 4 years ago

About the Zip System tape as a drainage plane – I wouldn’t be concerned myself. I don’t trust the cheap building tapes that regrettably dominate the mainstream house building market, because too often I’ve seen them turn brittle and peel right off the wall, particularly when they are subjected to the freeze / thaw cycle or are left exposed to UV rays for extended periods before covering them. But this stuff is better. 
So tape it properly, cover it soon afterwards, and, that’s another good reason to maybe go for the 4 inches of exterior insulation rather than just 2 inches, it will stay warmer. A 4 inch layer of rigid board insulation in Douglas BC would not be overkill.

Further to that, if you build your wall well then you shouldn’t be experiencing a regular water fall in there. That’s just my two cents, you seem to know your way around a wall assembly so it will have to be something you are comfortable with or you’re going to sit there staring at the wall wishing you had x-ray vision wondering if its leaking.

So if you want options, here is our peel and stick exterior weather barrier DIY installation video
And where did you find the vapor barrier paint here on our site or somewhere else? We tried it (we could because we did the exterior peel and stick membrane I mentioned above), it was part of an overall strategy that included 5.5 inch Rockwool batts in the wall and 8 inches of Rockwool rigid insulation boards on the exterior. 

As for cost comparison of ZIP sheathing vs normal sheathing and home wrap , there are way too many variables to pin that down accurately. You’d have to price out home wrap (Tyvek, Typar or whatever brand talks to you), plus sheathing (we prefer Plywood over OSB for Sheathing), then the labour to install it all. ZIP System is only one trip around the house. And if it’s a bungalow or you’re up and down scaffolding will even make a difference in labour. Sorry, not trying to dodge it but I’ll be blowing smoke up your wazoo if I told you I had an accurate price :) 

Trevor Prinz 4 years ago
SpaceCrete 3 years ago

I have looked at remodels where some of the original felt paper was replaced with a sythetic house wrap. In one case, a decade later, exactly at that point, the rot started. A clear line of defining the edge of the replacement synthetic "breathable" wrap, where the sheathing became spongy and mottled, wheras behind the original paper it was totally acceptable and sound. This is coastal north Pacific. So please consider me a skeptic about any new product or system in conjuction with wood in a marine climate. The Zip tape is very good tape though.