Illbruck ME501 Duo Window Membrane HD

ME501 is a high strength, tear resistant membrane made from polyethylene co-polymer film with non-woven fabric. It can be applied before or after window installation to suit on-site details and programming. It is also available with gasket options for fixing to window profiles.


ME501 provides a high performance seal to the perimeter joint between the window/curtain wall and the construction reveal. Due to the intelligent, variable vapour permeability (sd value), when used in an internal UK (warm) environment, it will be vapour-tight, and when used in an external UK (cold) environment it will be vapour open. This means that the membrane is suitable for interior and exterior use providing an air-tight and weather-tight seal whilst always complying with inside tighter than outside principles.


Complies with principle of ‘inside tighter than outside’ in order to facilitate efficient vapour control;

BBA accredited alternative to EPDM in many applications;
Excellent drying potential (due to the membrane’s vapour permeability) avoiding mould growth and physical damage;
UV stable  – will tolerate up to 9 months direct exposure prior to covering;

Fully compatible with illbruck building protection membranes.


To download BBA Agrément Certificate 12/4891 Sheet 1 on i3 incl TP600 Click Here

To download BBA Agrément Certificate 12/4891 Sheet 4 on ME500 and 501 Click Here

To download BBA Agrément Certificate 12/4891 Sheet 2 on i3 System including ME500 and 501 Click Here

For Technical Advice on application during Low TemperaturesClick Here

To download ME501 & SP525 Installation Method Statement Application GuidelinesClick Application Guidelines