Project Information
Wall U-value limit: Normal (≤ normal limit, 80% reduction if embedded system selected) ⓘ
Climate Zone Selection
IMPORTANT - Select your zone. Zone 7A is pre-selected as most common.
Zone Limits & Information

Zone 7A Limits:

  • Opaque walls: ≤ 0.215 W/(m²·K)
  • Roofs: ≤ 0.121 W/(m²·K)
  • Exposed Floors: ≤ 0.138 W/(m²·K)
Part 3 - Building Envelope – NECB Section 3.2
Area Calculations (m²)
m²
Sum of all wall areas including fenestrations & door. Exclude parapets, projected fins, ornamentation & appendages. (Table 3.1.1.6.3)).
m²
Includes windows, >50% glazed doors & curtainwall 0.0%
< 40% of gross wall area per 3.2.1.4
m²
Include doors with < 50% glazed area.
m²
Directly adjacent exposed floors
m²
Info required only if skylight is present
m²
Skylight-to-Roof Ratio (SRR) 0.0%
< 2% of gross roof area per 3.2.1.4.(2)
U-Values (W/(m²·K))
W/(m²·K)
Per Table 3.2.2.2 (≤3 storeys). ⓘ
Zone limit: 0.215 W/(m²·K)
W/(m²·K)
Per 3.2.3.2. ⓘ
Zone limit: 0.121 W/(m²·K)
W/(m²·K)
Per Table 3.2.3.3. ⓘ
Zone limit: 0.138 W/(m²·K)
W/(m²·K)
Per Table 3.2.2.3. ⓘ
Zone limit: 1.73 W/(m²·K)
Detailed Component Air Leakage (3.2.4.3)
L/(s·m²)
Limit: ≤ 0.20 L/(s·m²) @ 75 Pa. Continuous air barrier required per 3.2.4
L/(s·m²)
Tested assembly
L/(s·m²)
Tested assembly
L/(s·m²)
Tested per ASTM E283
L/(s·m²)
Exception per 3.2.4.3.(2)
L/(s·m²)
Exception per 3.2.4.3.(3)
L/(s·m²)
Exception per 3.2.4.3.(4) if total area ≤ 2% of gross wall area
Below-Grade Components (3.2.3)
W/(m²·K)
Max U-value @ ≤ 1.2m below grade ⓘ
Zone limit: ≤ W/(m²·K)
W/(m²·K)
Located ≤ 1.2m below grade ⓘ
Zone limit: ≤ W/(m²·K)
W/(m²·K)
Per NECB 3.2.3 requirements ⓘ
Zone limit: ≤ 0.757 W/(m²·K)
m
3.2.3.1.(3) - Min. 2.4m from grade ⓘ
Optional input
m
3.2.3.1.(5) - If <0.6m, insul. 1.2m perimeter ⓘ Optional input
      Table 3.2.3.1 Below Grade Quick Reference
Climate Zone Walls (W/(m²·K)) Roofs (W/(m²·K)) Floors (W/(m²·K)) Notes
Zone 4 0.568 0.284 0.757 1.2m perimeter
Zone 5 0.379 0.284 0.757 1.2m perimeter
Zone 6 0.284 0.284 0.757 1.2m perimeter
Zone 7A 0.284 0.210 0.757 1.2m perimeter
Zone 7B 0.284 0.210 0.757 1.2m perimeter
Zone 8 0.284 0.210 0.757 1.2m perimeter
Full area: 0.379
Zone 8 requires full area floor insulation when embedded systems present (3.2.3.3.(4))
Detailed Compliance Check
Component Proposed NECB Limit Status
FDWR Calculation Details
0.00 m²
0.00 m²
(0.00 ÷ 0.00) × 100% = 0.0%
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