Gluing rigid insulation - GreenBuildingAdvisor
Summary
This article discusses the process of gluing rigid foam board insulation in a stud cavity, providing practical advice on materials and techniques for effective insulation.
Why It Matters
Understanding how to properly install rigid insulation is crucial for energy efficiency in building projects. This guidance helps homeowners and builders make informed decisions that enhance thermal performance and prevent issues related to cold conduits.
Key Takeaways
- Gluing multiple sheets of rigid foam is a viable method to achieve desired thickness.
- Cutting foam boards slightly smaller than the cavity and sealing edges is recommended.
- Applying pressure during the setting process is essential to prevent the foam from falling out.
Gluing rigid insulation kickstarter | Posted in General Questions on February 18, 2026 03:22pm I’m looking to put some rigid foam board insulation in a standard 16″ stud cavity. Not for an entire house, just in one stud cavity to prevent a conduit that’s running against the back wall sheathing from getting cold. The stud cavity is framed with 2×6 studs. I think the best best would be 4″ of polyiso rigid foam. Can I glue two 2″ boards together? Finding 4″ isn’t proving easy. If so, what glue would you use? Also, would I cut the foam board slightly smaller than the stud cavity and foam the edges? Answer GBA Detail Library A collection of one thousand construction details organized by climate and house part Search and download construction details Join the leading community of building science experts Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field. Start free trial Related Questions Gluing cedar siding to furring strips: Good or bad idea? Gluing Polyiso Foam to Metal and Plywood Cavity insulation with exterior rigid foam Gluing rigid insulation to interior of roof sheathing Replies nis240shu | Feb 18, 2026 04:14pm | #1 Yes, you can glue/foam together more than one sheet to get the thickness you need. And yes, cutting the foam board slightly smaller and filling the edges is also a good idea. You'll want to keep some pressure on the foam boards until the foam sets up a bit. Otherwise, it can tr...
