Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Building Materials - Vapour Resistance

Sponsored Links

The vapor diffusion resistance through a material of a given thickness can be expressed as

Vr = t νr                                               (1)


Vr = vapor resistance (N s/kg)

t = thickness of material (m)

νr = vapor resistivity (N s/(kg m))

Vapor resistivity of some common building materials

Building Materials - Vapour Resistances
MaterialVapor Resistivity
(G N s/(kg m))
Brickwork 45 - 70
Concrete blocks, light weight 15 - 150
Render 100
Plaster, cement 75 - 205
Wood, pine 45 - 1850
Plywood 150 - 2000
Fiberboard 15 - 375
Hardboard 230 - 1000
Plasterboard 30 - 60
Straw-board, compressed 45 - 70
Wood-wool, slab 15 - 40
Polystyrene, expanded 100 - 750
Glass wool 5 - 7
Phenolic, closed cells 150 - 750
Gloss paint, average 40 - 200
Polyethylene sheet 110 - 120
Aluminum foil 4000
Sponsored Links

Related Topics


Calculate heat transfer and heat loss from buildings and technical applications. Heat transfer coefficients and insulation methods available for reduction of energy consumption.

Related Documents

Sponsored Links

Search Engineering ToolBox

  • the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!


We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.