Construction R-value Calculator

This online calculator calculates the R-value of a large number of common wall and roof constructions given a specified level of insulation. It uses the isothermal planes method to account for thermal bridging of framing material.

Keywords

R-value, thermal bridging

Validation/Testing

N/A

Expertise Required

Basic understanding of construction details is required.

Users

Approximately 15,000 web hits per month, mainly from New Zealand.

Audience

Designers and architects, researchers, officials dealing with building regulations

Input

The user selects the appropriate wall and roof design details from a number of drop-down boxes and enters the R-value of the installed insulation product.

Output

The program displays the R-value achieved by the wall or roof construction accounting for all layers of the structure including thermal bridging. (The program also displays the R-value performance in respect to a New Zealand good practice guide.)

Computer Platform

Web

Programming Language

JavaScript and PHP

Strengths

Extremely user friendly and quick, very transparent, quite flexible

Weaknesses

The list of international construction details is limited, but users are encouraged to submit new ones which will be added to the database

Contact

Company:

Design Navigator

Address:

New Zealand

E-mail:

Albrecht.Stoecklein@design-navigator.co.nz

Website:

http://www.design-navigator.co.nz/CRC.php

Availability

Free, available online.