Stucco: Install with Exterior Rockwool Insulation AND Ventilation

In this video, I'll show you a traditional 3 coat stucco installs with a drainage plane PLUS Rockwool exterior insulation! I'm using Rockwool's Comforboard 2" thick R-8 rigid insulation panels
And Boral's Drain-N-Dry Lath with Delta-Dry Technology!

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[tomim]

A lot of people here in Charlotte probably wish their houses had this system in place and not the fiasco of 20 years ago. Love it.

[Ninjump]

That is a beautiful and probably shockingly expensive assembly! Way cool to be able to work on those level of project!

[davidmcouch]

Matt can you show how this product would look with brick or rock facade?

[ArthurDentZaphodBeeb]

Spectacular assembly. Love that Boral Drain-N-Dry with a 3 coat stucco and that smooth LaHabra finish. Would love to have seen the detail for the top vent assembly. Every high-end stucco project should go with this. Those long cap screws must have been a pita to get everything consistent. Boral suggests using staples and shows that in their installation vids on normal (non-insulated exterior wall) jobs.

[danegrover]

Thanks for the Duluth mn mention. Love your channel and thanks for all the great building info

[japansh]

Hey Matt, Rockwool have in their installation manual the use of furring strips and even backer board for heavy weight cladding such as stucco? What is your take on that and why you didn't use at least furring strips to support the lath and thus the weight of the stucco?

[jacobkrzyzek]

Which cap fastener did you use? and if it is a blank that is crimped by a machine/screw gun, what is your setup?

[jonlivingston]

You mentioned not having control joints at the beginning but I believe it was left out. Can you provide more info on that?

[edbouhl]

Interesting! I wonder if this could be used to retrofit a fire resistant exterior (Say 1 inch comfortboard, that mesh, and then stucco) to existing wood siding homes?

[johnclark]

Hey Matt. Roxul appears to require sold backer board on purlins when installing ComfortBoard IS with stucco. Did they sign off on this?

[ArtisanTony]

The only thing that concerns me is the surface area of those button caps. Not sure you will get the same bond as the lath which sets up a different dynamic it seems like the windows are being buried in the system Usually your stucco terminations but against the windows. It seems the windows would need to be set out further in the plane of the wall. The 2” insulation would burry the windows by itself. I am sure it looks good though. Cant beat a well done stucco :)

[btownb]

I'd love to understand the wall venting details on the top and bottom of the wall. We have an enclosed soffit; where do you vent it and how do you keep bugs/rodents out, especially termites? I know Rockwool is rodent proof but I 'd like to know how you manage the detail so insects like spiders a& termites don't make nests in nooks. Thanks!

[suzycashbuilds]

Thanks for the video! Why did you choose to use a permeable house wrap? I would think it would be best to use a vapor retarder house wrap, so the wall assembly would be: sheathing, vapor retarder, rockwool, then the drainage lath mat, then stucco. So the vapor drainage and drying could happen on the exterior of the rockwool, but not get through to the sheathing. Your insight would be much appreciated, as I am designing a home with a similar wall assembly in Virginia. Thank you!

[ignaziodepinto]

Hi I am a stucco contractor in New Jersey. We are just getting into this Rockwall product for a huge project and I’m not sure how to handle the window details as you’re describing. How can we have a Stucco return? And how do we handle the expansion control joints throughout the walls? I’m also installing the La Habra cementitious finish like in this video.

[stevengorman]

The air vents bottom, top? And what happened with expansion joints?

[SD-coxe]

What is the stone applied to the exterior?

[MarkMyshatyn]

Without the synthetic lath wrapping around the edges of the Rockwool near the corners of the windows, how does that surface get finished without cracking?

[kejiefu]

Matt, could you let me know the source for those "cap fastener's" and screws?

[michaelchow]

Why did you choose to use Delta Drain-N-Dry rather than Delta Dry Stucco & Stone as the rainscreen? Did you use Delta VentS as a secondary vapor barrier over the Rockwool before putting on the rainscreen? thanks.

[jimwilcox]

Which is more expensive (1) the cost of all those long fastener used on the current assembly or (2) the cost of installing a layer of sheeting over the exterior Rockwool using a fraction of the fasteners and then just stabling the rain screen/mesh to that surface?