Calculators and tables produced by Efficiency Matrix useful for building science professionals.

#### Wind speed conversion calculator

Calculation of wind speed and induced pressure can be highly beneficial for comprehending the average total pressure that could impact ...

#### Converting R-value Metric to Imperial Calculator

Insulation R-Value Conversions, Imperial R-value is very very different to Metric R-values. If you come across any tables in the ...

#### Converting permeability rate CFM/ft2 to m3/h/m2 Calculator

To convert the permeability rate from cubic feet per minute per square foot (CFM/ft²) to cubic meters per hour per ...

#### Building Materials Vapour Permeance Conversion Calculator

Vapor permeable and vapor barrier materials are crucial in the construction of buildings for managing moisture content and ensuring the ...

#### Common Building Materials Vapor Permeance Table

Vapor permeable sarking/wraps or building products on the EXTERIOR of WALLS are designed to allow water vapor to diffuse through them, ...

#### What Caulk should I use?

There are many different types of caulk that have Pro's and Con's for many different purposes. In this table, we ...

#### Air Tightness Unit Converter

A calculator to understand the difference between permeability leakage rates and ACH@50Pa leakage rates, while at the same time understanding ...

#### What’s my actual R-value of my walls and my ceiling?

What’s my actual R-value of my walls and my ceiling? It's becoming quite widely known these days that small gaps ...

#### Static Pressure Limit

Static Pressure Limit If the product of the temperature differential across the building envelope (ΔT), multiplied by the building height ...

#### Air Leakage Unit Conversion

Credit to Retrotec for the initial work on this calculator. Any assumptions made are listed below in the assumptions box ...

#### R-Value, Wind, and Air flow Imperial to Metric Converter

R-Value, Wind, and Air flow Imperial to Metric Converter R-Value, Wind Speed/Pressure and permeability rate values can get really confusing ...

#### BCA Permeability Calculator

Inputs Building Predefined Enter Building Dimensions Building Volume (m3): Perimeter zone Volume (m3): Envelope area (m2): Length (m): Width (m): ...

#### Pressure Flow Conversion Calculator

Flow Inputs Input Test Pressure(Pa) Usually 150Pa: Input Leakage Rate (l/s.m2): Input Surface area (m2)(Optional): Output Permeability Pressure (Pa) Usually ...

#### The Blower Door Testing Calculator

Number of blower door fans needed for commercial blower door/air tightness testing. Flow Inputs Target Permeability (m3/h.m2@50pa): Envelope Area (m2): ...

#### Building Material R-Values

An Interesting video on common building envelope issues, in Australia. There are many websites on the internet which have Imperial ...