As energy efficiency codes tighten in Idaho and across the nation, Blower Door Testing in Boise has become an essential part of residential and commercial construction. For builders and contractors, understanding how to comply with standards like ASTM E779 and ASTM E1827 in Boise can help you deliver higher-performing buildings, pass inspections, and avoid costly delays.
What Is Blower Door Testing?
Blower door testing measures the airtightness of a building. Using a powerful calibrated fan mounted in an exterior doorway, the test depressurizes (or pressurizes) the structure to detect air leakage. Specialized gauges record airflow and pressure differences, revealing how much outside air enters through leaks in the building envelope.
In Boise, blower door testing is used to comply with energy codes such as the International Energy Conservation Code (IECC) adopted by the City of Boise and surrounding Ada County jurisdictions. This test verifies that homes and commercial buildings meet specified air leakage limits, critical for energy efficiency and meeting project specifications.
Why Blower Door Testing Matters for Boise Builders
- Energy Code Compliance: Idaho’s energy codes require blower door testing for most new homes and many commercial buildings. Passing the test is often a prerequisite for final inspections and certificates of occupancy.
- Reduced Callbacks and Complaints: Buildings that meet or exceed air leakage standards tend to have fewer drafts, lower utility bills, and happier occupants.
- Project Specifications: Blower Door Testing in Boise ensures that your project meets the specs, preventing work delays and further costs.
If you’re working in Meridian, Nampa, Caldwell, Eagle, or Kuna, the same testing requirements and benefits apply making blower door testing in Idaho an important step for every project.
ASTM E779 vs. ASTM E1827: Understanding the Difference
Two main test standards guide blower door testing in Boise and throughout the U.S.:
- ASTM E779 – Standard Test Method for Determining Air Leakage Rate by Fan Pressurization
- This is the traditional, multi-point test. It requires measuring airflow at several pressure differences (commonly between 10 and 60 Pascals).
- It’s considered more detailed and is often specified for larger buildings or projects requiring a high level of accuracy.
- This is the traditional, multi-point test. It requires measuring airflow at several pressure differences (commonly between 10 and 60 Pascals).
- ASTM E1827 – Standard Test Methods for Determining Airtightness of Buildings Using an Orifice Blower Door
- This standard allows for a single-point or repeated single-point test.
- It’s faster, often more cost-effective for smaller residential structures, and still produces reliable results when properly applied.
- This standard allows for a single-point or repeated single-point test.
ASTM E779 in Boise tends to be used for comprehensive, multi-point testing of commercial or complex buildings, while ASTM E1827 in Boise is common for single-point testing in residential construction.
What to Expect During a Blower Door Test in Boise
- Preparation: All exterior doors and windows are closed; interior doors remain open. HVAC systems are turned off.
- Fan Setup: A calibrated fan is installed in an exterior doorway and connected to digital pressure gauges.
- Test Execution: The technician depressurizes the building to a set pressure difference (usually 50 Pascals) and records the airflow.
- Data & Results: The technician calculates the building’s air changes per hour (ACH50) or CFM50, comparing it to code requirements.
- Reporting: You receive a detailed report to submit to the city or county building department.
Tips for Passing Blower Door Testing
- Seal Early: Pay attention to air sealing during framing and rough-in stages.
- Use Quality Materials: Weatherstripping, caulks, and spray foams help reduce leaks around windows, doors, and penetrations.
- Coordinate with Subcontractors: Plumbers, electricians, and HVAC installers can unintentionally create gaps. Walk the project with them and seal openings promptly.
Schedule Testing Before Finish Work: This allows time for corrections if the building initially fails.
Finding a Blower Door Testing Professional in Boise
Look for certified professionals who specialize in blower door testing in Boise, Meridian, Nampa, and Eagle? Certification from organizations like FGIA/AAMA can indicate a qualified tester familiar with ASTM E779 in Boise and ASTM E1827 in Boise standards.
Final Thoughts
For Boise builders and contractors, blower door testing isn’t just another item on the inspection checklist. It’s a chance to showcase craftsmanship, reduce callbacks, and meet Idaho’s growing demand for energy-efficient buildings. Whether your project calls for ASTM E779 or ASTM E1827, understanding the testing process ensures a smoother path to project completion.