Continuous exterior insulation is a newer, popular way to support optimal thermal and moisture protection for new builds, additions, and some renovation projects. Model ReModel 2022’s builder Symbi Homes will follow the same high performance building method for their net zero in-law suite addition.
Symbi installed a continuous layer of R-5 rigid polystyrene foam on top of a Tyvek water resistant barrier across all exterior walls. When added to their R-21 Greenfiber spray-applied cellulose on the interior, the unit now boasts a super-efficient R-26 wall assembly.
So what makes exterior insulation so special?
Because rigid exterior insulation is outside the framing members, it can wrap continuously around a building (with the exception of window and door openings) unimpeded by wall studs. Traditional lumber is notoriously low in R-value (about R-1 per inch), and therefore diminishes the thermal protection in a typical wall assembly.
Second, exterior insulation adds another layer of protection around the entire shell of the home. In warm climates, a foil-faced exterior foam can prevent solar heat gain from entering the building. In cold climates, a rigid polystyrene foam can help insulate the exterior sheathing of the house, preventing condensation on the inside.
Click here to read the full article on Model ReModel's project site.
Add new comment
Related Stories
Model ReModel 2022: A Case Study in Sustainable, Thoughtful Construction
The eighth annual Model ReModel project features an accessory dwelling unit, designed for aging in place, attached to a 19th-century Victorian
Installing a Curbless Shower
Model ReModel 2022 features an ADA-compliant bathroom. The contractor shares the install process
Heat Pump, Air Handler, and Mini Split at Model ReModel
See the components of Model ReModel's high-performance HVAC system
Polished Concrete Flooring Goes In at Model ReModel
To Vent or Not to Vent: A Discussion
In an attempt to strike a middle ground between high-performance and attainable, these three remodelers engage in a candid conversation
Ceiling Insulation and Installation at Model ReModel
Watch the building process of this accessory dwelling unit's vaulted ceiling
Preparing as a Remodeler for the Inflation Reduction Act
Why Blow-In Cellulose Insulation?
Hear why the Model ReModel contractor chose blow-in cellulose and watch the installation
3 Tips for Rough-In Photos
These three quick tips will maximize the usefulness of your rough-in images, ensuring they're helpful for years to come
To Vent or Not to Vent, Part 2: The Decision
Symbi Homes, the Model ReModel 2022 contractor, has decided on whether or not to vent the 800 square foot in-law suite addition