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.
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 ² NECB Section 3.2
Area Calculations (m²)
m²
Sum of all wall areas including fenestrations & door. Exclude parapets, ornamentation... (Table 3.1.1.6.3)).
m²
FDWR for HDD: 5700 (Zone 7A)
0.0%
Enter values to calculate FDWR
m²
Include doors with < 50% glazed area.
m²
Directly adjacent exposed floors
m²
Gross roof area includes skylights & roof hatches.
m²
Skylight-to-Roof Ratio (SRR) 0.0%
< 2% of gross roof area per 3.2.1.4.(2)
Above-ground U-Values (W/(m²·K))
W/(m²·K)
Per Table 3.2.2.2 ?
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)
In Contact w/ Ground U-Values (W/(m²·K)))
W/(m²·K)
Max U-value @ = 1.2m below ground ?
Zone limit: = W/(m²·K)
W/(m²·K)
Located = 1.2m below ground ?
Zone limit: = W/(m²·K)
W/(m²·K)
Per NECB 3.2.3 requirements ?
Zone limit: = 0.757 W/(m²·K)
               
 
Air Leakage (L/(s²m²))

FENESTRATIONS

L/(s²m²)
Per 3.2.4.3.(2) & 3.2.4.3.(3)
L/(s²m²)
Per 3.2.4.3.(4)

DOORS

L/(s²m²)
Exception per 3.2.4.3.(2)
L/(s²m²)
Limit increased to 14 L/(s²m²) if door is = 2% of gross wall area, per 3.2.4.3.(4)
W/(m²·K)
Per 3.2.2.4.(4)
For information only
L/(s²m²)
Limit: = 0.20 L/(s²m²) @ 75 Pa. Continuous air barrier required per 3.2.4
For information only
m
3.2.3.1.(3) - Min. 2.4m from ground ?
For information only
m
3.2.3.1.(5) - If <0.6m, insul. 1.2m perimeter insul ? For information only
FDWR Calculation (HDD-Based)
5700 HDD (Zone 7A default)
Formula: (2000 - 0.2 ² 5700) / 3000 = 28.7% max
CALCULATING...
0.0%
Formula: Enter values above to calculate
FDWR Progress Max: 28.7%
0% 0% 28.7%
NECB 3.2.1.4 Formulas:
² HDD = 4000: FDWR = 40%
² 4000 < HDD < 7000: FDWR = (2000 - 0.2 ² HDD) / 3000
² HDD = 7000: FDWR = 20%
Detailed Compliance Check
Component Proposed NECB Limit Status
AI-Assisted Analysis

No analysis generated yet. Click "Analyze with AI" above to begin.

Requires a configured Cloudflare Bridge or API key in settings.

Actions
v2.0 NECB 2025 Prescriptive Compliance Tool