A DIY Guide to Polyiso Insulation for Walls, Roofs, and Foundations
By Graham Mann | Published: 11/10/2025
Explore the benefits and installation tips for polyiso insulation, an efficient and eco-friendly choice for improving your home's energy performance.
A DIY Guide to Polyiso Insulation for Walls, Roofs, and Foundations Polyiso insulation is a top choice for DIY home projects due to its high thermal resistance(https://diyecohomes.com/blog/polyiso-insulation-pros-cons-when-to-use/), moisture resistance, and lightweight design. It works well for walls, roofs, and foundations, offering excellent energy savings and durability. While it costs more upfront than fiberglass, its efficiency can cut heating and cooling costs by 20-40% over time. Here’s what you need to know: - Key Features: High R-value (6.0–6.5 per inch), moisture-resistant, fire-resistant, and often includes reflective facings. - Applications: Ideal for tight spaces in walls, roofs, and below-grade foundations. - Tools: Utility knife, impact driver, tape, and safety gear. - Installation Tips: Measure accurately, seal seams, and avoid compressing the boards. - Climate Considerations: Adjust vapor barriers and drainage based on your region. This guide walks you through step-by-...
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