The system sounds like EIFS- Exterior insulation and finishing system. It's basically a polymer stucco material with sheathing, a scratch coat with embedded fiberglass mesh, 2" thick minimum aged styrofoam insulation and one or two coats of the finish stucco.
Benefits are that you can form the stucco with grooves or projections, of have it formed into cornices and other details.
But- Make sure it is back drained to let any water that gets in gets weeped out. There were a lot of problems in residential use- mold and such- so it is imperative that the system is installed by an experienced contractor that follows the manufacturer's instructions to the letter.
The manufacturers include Dryvit, Sto, and a few others.
The IBC code requires Special Inspections in some types of construction but the Residential code might not.
Be sure to follow the details around windows, doors, and penetrations. The fiberglass mesh and finish coats all have to be returned to the inside of the rough opening under the flashing.
We mostly do commercial projects- not much wood framing. If you have questions on this let me know.
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Peter Elkin AIA
Peter Elkin Architect
Commack NY
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Original Message:
Sent: 08-25-2020 17:52
From: Jorge Pena
Subject: Best exterior wall assembly
I'm designing and building my own home in South Texas, and I've been reading about Building Science exterior wall assemblies where the insulation recommended for this climate is 2" min. rigid insulation installed on the outside of the 2x4 framing and sheathing. Does anybody has any experience with this method of building? and if so, what details you use for windows, doors, slab to wall, wall to roof, etc.
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Jorge Pena
President
JPA architects
San Antonio TX
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