⬡ ENVELOPE BUILDER
N-Layer Assembly · Condensation Screening · Owner View
🌡 Temperature Profile — Outside → Inside
- ❄ Winter Temp (°F)
- ☀ Summer Temp (°F)
💧 Vapor Pressure Profile — Outside → Inside
- ❄ W-Vapor
- ❄ W-Sat (limit)
- ☀ S-Vapor
- ☀ S-Sat (limit)
❌ CONDENSATION RISK
Zone Method R
R-43.4
w/ fastener bridge
Nominal R
R-47.3
no fastener penalty
Worst Δp
637 Pa
condensation screen
❄ Indoor Dew
44.6°F
RH 40%
ASHRAE Zone Method · R corrected for mean layer temp · Fastener bridge per 90.1-2022 §A9.4 · Framing fraction = area-weighted parallel path
▸ Transient Hygrothermal (HBF)
Time Constant τSteady-State
Steady-State12h snap7d30d seasonal
Assembly MSC: 30.27 kg/m²· High buffer (hygroscopic mass)
☀ Solar-Driven Diffusion
Inward vapor drive from solar-heated cladding
▸ Fastener Density & Span
Fastener Density0.5/ft²
Fastener Span (layer indices)
Start Layer
End Layer
Fasteners bridge L2→L4 · shown in SVG view
🗺 ASHRAE Climate Zone — 90.1-2022
❄ Winter Conditions
Indoor Humidity40%
Indoor Temp70°F
Outdoor Temp15°F
☀ Summer Conditions
Outdoor Humidity75%
Indoor Temp (AC)72°F
Outdoor Temp95°F
ℹ How It Works
Pick a preset or use Custom Build to stack your own layers from outside in. Choose from steel panels, shingles+plywood, sheathing, CI foam, spray foam, blown-in cellulose, fiberglass batts, and more. Adjust thicknesses, reorder, or add/remove layers. PASS = no condensation plane detected. FAIL = moisture risk inside the assembly.
Glaser steady-state + HBF transient damping + solar-driven diffusion · Screening tool only · Not a substitute for WUFI or full hygrothermal analysis · Mythic Engineering