JCWR+D
MLIT New Technology Information
System (NETIS) Registered Product(Registration No. TH-120012-A)

Waterproofing that breathes

Rooftop Waterproofing Air Control
New waterproofing method helps extend the life of buildings and promotes conservation
by removing moisture and heat from inside a roof's waterproofing layer

Fresh air

Hot and humid Air

Waterproofing
Aerated zone
Building frame

JCWR+D

Japan Conference of Construction Worksfor Research and Development

Japan Conference of Construction Works for Research and Development

Structure・Effectiveness

JCWR+D

Fundamental Air Control (AC) Method
An Utsunomiya University/Oyama College/AIREC jointly developed productTo overcome the drawbacks of conventional methods focused on waterproofing properties, this collaborative
project produced waterproofing that breathes, effectively discharging water accumulating inside thewaterproofing layer by including a ventilation mechanism within the waterproofing layer. We have successfully
created Air Control roof waterproofing that achieves excellent ventilation combinable with existingwaterproofing methods.
■ Mechanism/Installation Standard
Intake ventDeaeration cylinder ventilation capacity: Max 300 m2/1 unit
Air intakeExhaust

Solar JET ventilation
with fan300 m2 space installation
Exhaust vent: 1 unit; Air intake cylinder: 2 ormore units*Products with heat insulation specifications
Exhaust vent: 2 units; Air intake cylinder: 4or more units*When waterproofing layer is installed over insulation material, waterproofing layer may become hotter in summer compared toconventional methods, reaching around 80・C (Architectural Institute of Japan; Membrane Waterproofing Work, p. 125).

■ Benefits and Characteristics of the AC Method

Improves soundness of the entire building
including the waterproofing layer

Autonomous forced supply of fresh air through the AC method
Removes moisture

Reduces water

Removes heat
Suppresses moldand corrosion

Prevents heataccumulation● Restores soundness of waterproofing layer and frame ● Improves
environment inside the layer ● Reduced air-conditioning costs, etc.

● Extended life ● Enhanced comfort ● Lower energy costs, etc.

Data・Construction

JCWR+D■ Data(*Measured in Utsunomiya, Tochigi)■ Conventional exhaust method

Natural ventilation exhaust vent(stainless steel)■ Air Control (AC) method

Conventionaldeaeration
methodWaterproofing
layer surface
Insidewaterproofing
layer
Differencebetween layer
surface and inside
Skeleton surface

Max summer
temperature

Exhaust fromexhaust ventUnmeasurable

Unmeasurable

Unmeasurable

Unmeasurable

AC method

Max summer
temperature
65CHumidity

Lowest wintertemperature-8 to -13C

Humidity

Waterproofing
layer surface
Insidewaterproofing
layer
Difference
between layer
surface and inside

Solar JET ventilation with fan

Humidity

Lowest wintertemperature

60 to 70C-10 to -15C

59 to 68C

-10 to -15C

1 to 2C0C

58C-10 to -15C40C or lower-2 to -7C

20C or higher

6C or higher

Skeleton surface

40C or lower-2C

Exhaust fromexhaust vent

40C or lower

300 g to800 g/day-2C*For humidity, exhaust changes by site.

■ Construction
Urethane coating method

Aqueous acrylic coating method

Vinyl chloride sheet method

Modified asphalt method

FRP sheet method

Humidity

100 g to300 g/dayR＋D××××××