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Waterproof, GORE-TEX and eVent explained

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Waterproof, GORE-TEX and eVent explained

An example of a GORE-TEX® Pro Shell, releasing heat and fending off rain.

An example of how eVent® works to ‘let the air out’™

Choosing the right membrane can take time and effort!

Why can’t you wear a bin bag on the hill?
Did you know that a bin bag is waterproof? True. Not stylish, but still waterproof. It’s cheap too. We don’t sell them, but that’s okay. We don’t think you’d want one anyway. Even though water will run off it like you’re a duck, you’ll soon want a proper waterproof. Wearing a waterproof, but not breathable bin bag means you’ll probably lose 2 stone in sweat, as well as your sense of humour, and need to top up your Camelbak before you’ve even considered climbing a hill. Our point is, for exertion, you probably need to shell out a bit more on your hardshell.
The bin bag analogy is similar to wearing a really cheap coated waterproof. Coated with a DWR (Durable water repellent) that encourages water to bead off, but also keeping moisture in, the difference between cheap and not so cheerful and more expensive but comfortable is breathability- or moisture release. Your body creates heat just by your breathing and your heart pumping. Your own physiology works so that even a bit of movement causes heat to be released. If you’re wearing the wrong clothes (like cotton, or a waterproof that doesn’t let this heat and moisture escape)- you’re going to feel wet.
The main forerunners in waterproof and breathability expertise are membrane fabrics like GORE-TEX® and eVent®.
A GORE-TEX® product is made from a bi-component membrane. This works a bit like your skin, with over 9 million microscopic pores per square inch, all 20,000 times smaller than a single bead of water. The pore size is still 700 times larger than a moisture vapour molecule which allows gas and heat to be released. A breathable oil-hating cover is also integrated into your GORE-TEX® membrane, which is olephobic (able to repel liquid, oils, cosmetics and dirt).
eVent® is a fabric designed to work as a waterproof and breathable membrane, used in a variety of outdoor garments, most commonly seen in waterproof jackets .eVent® fabrics are designed to ‘let the sweat out™’ and use a patented waterproof membrane constructed of millions of tiny pores. From these pores, sweat vents to the outside of the fabric in one easy step, called Direct Venting™ Technology.
What are the differences between them?
The difference between eVent® and GORE-TEX® is that:
eVent avoids using a PU membrane. Whereas a GORE-TEX® jacket uses a polyurethane layer in their fabrics to absorb sweat in a two layer process, eVent® application is made to the inner layers of the garment, taking away the need for a PU layer.
eVent refer to this as Direct Venting Technology. This means that eVent® is technically more breathable, and therefore quicker to dry, than GORE-TEX®.
HOWEVER – this isn’t all good news, as eVent® may need more care than a GORE-TEX® alternative as the PU layer protects the PTFE layer from oil and grease. Chances are your eVent® jacket will need to be washed and reproofed more often than a GORE-TEX® alternative. Because of the highly breathable benefits of eVent® this is even more important than with other membranes, as it will keep your eVent® garment performing at it’s best!
The fabrics of GORE-TEX® and eVent® are both designed to fit the same purpose, to be breathable, windproof and waterproof, and both membranes do this remarkably well. Obviously, this doesn’t make choosing between them much easier! The key point is that the differences in how the membranes are made means that some e-Vent® is generally more breathable, whereas GORE-TEX® is warmer. However it’s important to remember that because both membranes are 100% waterproof, there’s always going to be a compromise at some point on how breathable and cool you feel.
Neither GORE-TEX® nor eVent® will work like magic, keeping you completely cool against extreme heat. The best advice I can give is to choose from your budget (eVent® tends to be slightly pricier) and if you’re still pushed to make a decision, then I suggest you choose eVent® for warmer conditions, and GORE-TEX® for cooler conditions.
I hope this clears up some of the basics of waterproofing and a bit about GORE® and eVent® for some of you! If you’re still interested and want more information, click for our guide to GORE-TEX ®.

Vapor/waterproofing membrane for facades – medium vapor permeability

Highly flexible waterproofing and vapor control system Fast, easy and secure application even in corners Provided with CE-mark according to EN 13984: 2011 Meet fire retardant requirements of EN 13501-1 Class E under free suspension No additional mechanical fixing necessary Membrane pre-treatment free Suitable for uneven substrates (blowholes in concrete), leveling of substrate by adhesive Suited to site conditions Durable bond and barrier/seal Ozone- and UV-resistant

PRODUCT BENEFITS Highly flexible waterproofing and vapor control system Fast, easy and secure application even in corners Provided with CE-mark according to EN 13984: 2011 Meet fire retardant requirements of EN 13501-1 Class E under free suspension No additional mechanical fixing necessary Membrane pre-treatment free Suitable for uneven substrates (blowholes in concrete), leveling of substrate by adhesive Suited to site conditions Durable bond and barrier/seal Ozone- and UV-resistant

Areas of Application
The flexible SikaMembran® sheets, installed between structure and incorporated units (e.g. facade elements, windows, etc.) using SikaBond® TF plus N adhesive, provide a secure and durable vapor barrier and waterproof seal at junctions between building elements mainly in curtain wall facades but also in ventilated facades and window installations. This product is suitable for experienced professional users only. Test with actual substrates and conditions have to be performed to ensure adhesion and material compatibility.

Product Data Sheet (PDS)
PDF - 485 KB
(en)

CE DOP - SikaMembran® Outdoor - EN 13984
Declaration of Performance
PDF - 145 KB
(en)

SikaMembran® Outdoor is an EPDM sheet membrane with a s d value of 45 m. The SikaMembran® system is a high-performance vapor control system comprising of various EPDM sheet membranes providing vapor control layers and waterproof barriers for curtain walls. They are suitable for most climatic conditions in combination with the appropriate adhesive.

200 pphm, 40 °C, 20 % Elongation, 168 h
A) stored in dry conditions between 5 and 30 °C and protected from direct sunlight
Prior the bonding process ensure that substrates are sound, clean, dry, free from dust, grease, oil and loose particles.
Apply SikaBond® TF plus N adhesive to the corresponding structure or components (nozzle diameter approx. 8 mm). By using a clean spatula, spread the adhesive bead to approx. 4 - 5 cm width and 1 mm thickness. Install the SikaMembran® Outdoor sheet tension-free and in a way that movement of the connected building parts can be accommodated without damaging the membrane. Press the membrane sheet on the adhesive by a plastic roller. The membrane must be fully bonded over a width of 4 cm. Where overlaps are required ensure at least an overlap of 5 cm. The membrane might be re-adjusted during a period of 30 minutes after installation.
SikaMembran® Outdoor is not resistant to mineral oils, petroleum, benzene, fuel and toluene etc. The bond line of the membrane must not be in permanent contact with water.
Diffusion resistance coefficient (DIN 53122-1)
Tear propagation resistance (CQP045-1 / ISO 34)

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