10/12/2026
Is under-slab insulation really worth it? For a high-performance home, the answer is yes. 👍
Skipping under-slab insulation might save a few dollars upfront but it can cost your clients in long-term comfort and energy efficiency.
Heat moves from warm to cold. Without insulation beneath the slab, concrete creates a direct path for heat loss to the ground, making it harder to maintain comfortable interior temperatures.
Here’s how to do it right:
👉 Use high-performance rigid insulation like Halo®️ Subterra®️.
👉 Cut penetrations precisely around plumbing and seal any gaps.
👉 Insulate and seal the perimeter to reduce thermal bridging at the slab-to-wall connection.
👉 Tape the joints to create a continuous layer.
A better-performing home starts below the slab.