HydroGap – The Best-Performing Housewrap. Period.
3rd party testing* shows that HydroGap REMOVES over 93% of bulk water while the leading housewrap TRAPS over 99%.
Did you know that major siding manufacturers, such as James Hardie and Boral, have recently issued drainage requirements behind their products? Drainable housewraps with a drainage efficiency of at least 90% when tested according to ASTM E2273 are now recommended or required behind certain exterior sidings.
Drainage efficiency isn't the whole story. We suggest that you question how long it takes to reach the 90% – how fast does your housewrap remove the moisture? The longer moisture remains trapped, the longer it has to cause mold, rot and premature failure.
HydroGap Drainable Housewrap eliminates excess moisture in a matter of minutes and prevents the damaging effects of mold and rot. Its unique design provides up to two times the performance over other drainable housewraps and removes over 100 times more bulk water than standard housewraps.
* As tested by CTL Group
Why it Works
See how our patented 1mm spacers provides a continuous drainage gap.
Fiber cement over HydroGap
Fiber cement over flat housewrap
Head to Head: HydroGap vs. Standard Flat Housewrap
Features & Benefits
Removes 100x more bulk water versus standard housewraps & drains 2x faster than other drainable housewraps
Superior strength & water hold out. Moisture barrier layer is protected between two non-woven layers
Allows installation in any direction, reduces waste
Allows for a consistent 1mm gap behind your cladding
Will not trap moisture within the structure
97% drainage rate (ASTM 2273)
Meets all existing codes for drainability
Can be exposed for 120 days
Easy to install
No special tools or design changes required
5ft x 100ft roll
Allows for convenient one-person installation
Non-slip / non-glare surface
Reduces risk of slipping and does not reflect sunlight
HydroGap vs. Standard Housewraps
Typical housewraps usually are either 1 or 2 layers and can be either woven or non-woven.
HydroGap has a 3 layer, non-woven substrate to provide superior tear, water and air resistance.
Typical housewraps provide only a water-resistant barrier which can trap water behind claddings.
HydroGap's drainage space removes 100x more bulk water while acting as a water-resistant barrier.
HydroGap vs. Slicker Rainscreen
Hydrogap combines a water-resistant barrier and drainage system into a single product application.
Slicker provides the maximum amount of drainage but does not offer a water-resistant barrier.
Hydrogap is ideal for areas that receive lower levels of rainfall and moisture and behind claddings that do not need to be ventilated.
Slicker provides superior drainage and ventilation for maximum drying potential in locations with high wind-driven rain and behind moisture-absorptive claddings.
HydroGap Approved Compatible Products
- Fiber Cement
- Wood (including shingles & shakes)
- Vinyl & Insulated Vinyl
- Manufactured Stone
- Benjamin Obdyke HydroFlash®*
- 3M™ All Weather Flashing Tape 8067
- DuPont™ FlexWrap™ NF
- ZIPsystem™ Flashing Tape
- Protecto Wrap Super Stick
- SIGA Wigluv
- SIGA Fentrim F
- Nichigo G-Tape™ 3040BK
- Cap Fasteners*
- Benjamin Obdyke HydroFlash® 2.5"
- Or 4" width self-adhered flashing from list below to the left
- Benjamin Obdyke HydroFlash®*
- Benjamin Obdyke HydroFlash® and HydroCorner®*
- Minimum 9" self-adhered flashing
- See self-adhered flashing list
Caulks & Sealants
- OSI® WinTeQ™ TeQ::Seal™ Sealant
- Loctite® Premium® construction adhesive
- Loctite® PL Premium® S40 polyurethane
- GeoCel® 2300 Construction Tripolymer
- GeoCel® Pro Flex®
- Fortifiber® Moistop® Sealant
- Bostik® 915™ polyurethane sealant
- Bostik® 915FS™ polyurethane sealant
- Dow Corning® 732 multi-purpose sealant
- NPC® Solar Seal #900
- Titebond® Heavy Duty construction adhesive
- Titebond® WeatherMaster™
- Titebond® WeatherMaster™ ULTIMATE MP
- Tremco® Vulkem® 116
- DAP® Flexible CLEAR Sealant
*Components to achieve 15 YEAR PRODUCT AND LABOR LIMITED WARRANTY
Application & Installation
This video details how to install HydroGap® Drainable Housewrap and HydroFlash® Self-Adhered Flashing.
This video uses building science technical data to show how HydroGap maintains space between the siding and the wall.
Technical Specs & Information
Dry Breaking Force
ASTM D 5034
Machine ≥ 40lbf
Cross Machine ≥ 35lbf
Machine 58.04 lbf
Crosswise 50.64 lbf
AC38 Section 3.3.2 (4.2.1)
Withstand 55cm of water for period of 5 hours
PASS - no penetration
CCMC Guide MF07102
No water observed passing through membrane
Water resistance by dry indicator method
Water Vapor Transmission
ASTM E 96
Minimum Permeance (perms) 5
Min. Vapor Transmission 35 (g/24 . m2)
Method A: 16 perms
Method B: 14 perms
Transmission: (g/24 . m2) 104.6
Cold Mandrel Bend
AC38 Section 3.3.4
No cracking at 1/16" diameter bend with temperature: 32°F
ASTM E 2178
At 75 Pa calculated Flow rate ≤ 0.02 L/(s.m2)
Metric: 0.0082 L/(s.m2)
Standard: 0.0161 cft/(min.ft2)
ASTM E 2273
Min. Drainage Efficiency ≥ 90%
96% Drainage Efficiency
Surface Burning Characteristics
ASTM E 84
Flame Spread Index (FSI) < 100
Smoke Developed Index (SDI) < 450
FSI = 0
SDI = 75
Ultraviolet Light Exposure
AC38 Section 4.1.2
UV exposure of 210 hours
For the Homeowner
Why moisture management is important
Increasingly, builders, contractors and architects face the need to incorporate good moisture management solutions when designing and building structures to ward off problems such as mold, mildew or structural damage due to improper moisture management.
The pressure outside your house is greater than the pressure within. Combine that with exposure to wind and if proper moisture management is lacking, then water has the potential to be driven into your wall.
How moisture can get in
Consider just how many holes are protruding through your wall. This example shows the potential for hundreds, even thousands, of holes for moisture to enter. A good moisture management solution is needed to prevent the water from entering your wall.