High-Performance Building & Retrofits
High-Performance Wall and Roof Assemblies
Our standard high-performance assembly is designed for New Hampshire's cold, wet climate and is built to dry in both directions.
- NH licensed home inspector
- EPA certified lead renovator
- 55+ years combined experience
- 115K+ hours combined experience
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How an Atlas home is built
- Plywood wall and roof sheathing. We do not use OSB on high-performance builds.
- Vycor enV-S fully adhered air and water barrier over the sheathing.
- Continuous TimberBoard wood-fiber insulation outside the framing, which keeps the sheathing warm and the assembly vapor-open.
- A ventilated rainscreen behind the siding and a vented over-roof.
- Balanced ventilation (ERV or HRV) and right-sized heat pump heating and cooling.
- Blower-door testing to confirm airtightness.
Why it matters
Moisture trapped in cold sheathing is one of the most common reasons newer houses rot, grow mold or need early repairs. A warm, vapor-open wall greatly lowers that risk, and a tight, well-ventilated house is more comfortable and healthier to live in.
Go deeper
Read the ultimate wall assembly for the New Hampshire climate, why we use TimberBoard, and our honest comparison of high-performance and standard construction.
Common questions
Why no OSB?
Plywood tolerates wetting and drying better than OSB and holds fasteners well, which matters in a wall designed to last generations.
Related reading
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High-performance new homes
New homes designed to last several lifetimes.