OS-sheets Waterprooﬁng System
Waterproof construction in pursuit of simplicity and quality

Features of the OS-sheets waterprooﬁng system
FUTURE01

Improved construction quality and stable quality that is not aﬀectedby the ability of the worker！

Stable quality has been achieved by mechanizing the sheet lamination process.
Traditional torch method

OS-sheets Waterprooﬁng System

Quantity oflabor decreases in（ Z T- 4 0 ）4%済OS-sheets aﬃxing

Attaching the lower layer sheet(Joint torch burner work)

Field work

Upper layer sheet aﬃxing（Full use of torch burner）

Consumptionof the energy
becomes1

POINT

Processed in the factory
Quality Improvement Eﬀect of Mechanization

10
Improve

The number of workers
Working time

productivity ofwaterprooﬁng
work.
POINT

The number of workers and the work time are large.

FUTURE02

The number of workers and the work time aresmall .

FUTURE

Faster construction speed
and higher productivity!

The lower layer sheet process is omitted, and thetorch work is performed only on the joint part.
The labor force is small, and the construction canbe done quickly.

03

Realization of construction that is friendly
to people and the global environment!

Since the torch work is performed only on the sheet joint, the burden on the operator
can be greatly reduced.
The amount of ﬁre used is signiﬁcantly reduced compared to the full-surface torch
method, and CO2 emissions can be reduced by about 90%.
Approximately

Environmentally friendly waterprooﬁng construction
Since the torch work area is as small as 1/10,
the burden on the operator and CO2 emissions canbe greatly reduced.

Please check out the video ofthe easy installation of OS-sheets
waterprooﬁng.

CO 2

CO 2

CO 2

Traditional torch method

01

90 %

reduction in
CO2 emissions

CO2

OS-sheets Waterprooﬁng System

Labor-saving
construction

There are so many advantages
to simplifying materials and processes.

Increased
Productivity

Ensuring
quality

Friendly
to workers
andthe planet

FUTURE

04

Labor-saving waterprooﬁng work

The simple material composition reduces material volume costs, and the short construction period reduces
management costs.

Improvement of productivity
by saving labor in construction
POINT

By saving labor, it is possible to carry out
construction with a small number of workers.
Traditional
torch method

OS-sheets
Waterprooﬁng
System

POINT

POINT

By integrating the conventional underpasted sheet and the top-pasted sheet
at the factory,
we were able to reduce the number ofmaterials.

The simple material composition reduces
the amount of transportation and reducestransportation costs.

Traditional
torch method

4 people・5 days

Reduced costs for materialtransportation andinventory management

Reduction in the numberof materials

OS-sheets
Waterprooﬁng
System

Traditional
torch method

OS-sheets
Waterprooﬁng
System3 people・4 days

POINT

Due to the increased productivity, a large
waterprooﬁng area can be installed.
Traditional
torch method

OS-sheets
Waterprooﬁng
SystemConstruction area

It makes it easier to manage inventory
and secure storage locations.

POINT

OS-sheets
Waterprooﬁng
System

Traditional
torch method

Improved quality can be achieved bymechanizing the process.

【 Cost per waterprooﬁng work area 】
Through the "OS-sheets waterprooﬁng system," we are realizing the themeof "being kind to the global environment and work environment, and reducing construction costs."

Traditional
torch method

Construction cost

OS-sheets
Waterprooﬁng Construction cost
SystemMaterial transportation costs

Material costMaterial cost＆

Management costs

Material transportation costs＆

Management costs

Merit

02

The "Protective Seal" prevents rainwaterand torch ﬂames from entering the back of the seat.

Hy br i d Mod iﬁ ed As phal t Tar pau li n

OS-sheets
conﬁdence

Modiﬁed asphalt(Thermal welding surface)

Sheet joint parts

The joint between the lower layer sheet
and the upper layer sheet is integrated
by heat welding.

Fast

Partial adhesive layer
OS-sheets peel oﬀ the release ﬁlm
and attach it to the base.

03

ﬁlm

Protective Seal
（Self-adhesive seals）

Hybrid Modiﬁed Asphalt Tarpaulin

What is Os-sheets?
O
S

Only One

Characteristics of the two construction methodsof modiﬁed asphalt tarpaulin

Simple & Speedy

It is an environmentally friendly, economically eﬀective,
waterproof sheet that has the excellent durability and

Self-adhesive
construction method

Torch method

watertightness of modiﬁed asphalt, as well as the ability
to follow the substrate and breathability.

Advantages

Since the process can be reduced, it leads to a shorteningof the construction period and a reduction in construction

Advantages

Watertightness of the sheet
joint parts

costs.
Since only the sheet joint parts are torched, the installation

Construction is fast, and there isno uneven adhesion to the baseby the operator.

is fast and easy.
This is a hybrid modiﬁed asphalt tarpaulin that combines

Disadvantages

the advantages of heat welding of torch method joints

Disadvantages

When torching the entire back of
the sheets a lot of ﬁre is used,which can be aﬀected by the skillof the operator.

and the advantages of self-adhesive construction method.
Compared to the conventional torch method, the amountof ﬁre used can be minimized, and the work environment

There is a slight problem with the sheet
joints, and it is necessary to use materials to assist in the joining.

can be greatly improved.

OS-sheets is a construction method that extends the advantages of both sides
and complements the disadvantages, and can achieve both workability and reliability.

❶ Quality❷ Workability❸Environmental
Friendliness❹ Economic
EﬀectsOS-sheets

01

Quality

Improved quality ( O S -Z 40 )ＵP!!

WorkabilityＵP!!

By mechanization, it is made into a high-quality, high-performance tarpaulin.
Since the bonding process of the bottom and top pasting is mechanized at the factory, the quality of the adhesive surface is improved regardlessof the skill of the operator.
This reduces the on-site sheet lamination process while improving quality, shortening the construction period.
【Conventional construction methods】【The composition of thewaterprooﬁng layer】<Construction details>❶ Attach the underlayer waterproof
ventilation
sheet.
After attaching the lower layer
Underlayer waterwaterproof ventilation sheet,proof ventilation
it is necessary to perform skilled sheet
work of gluing the entire backsurface of the upper layer tarpaulin with a torch.
❷Weld the entire back of the upperlayer waterproof sheet to the lower
waterproof ventilation sheet while
torching the entire surface.
Upper layer waterproof
sheet<Ｑuality>
It is easily aﬀected by the competence of the worker, and thequality is likely to vary.

LP

Underlayer water-proof ventilation
sheet

Waterprooﬁng layer
Ventilation layer

ventiduct

steam

rubber asphalt
water

Even if the composition of the ﬁnishedwaterprooﬁng layer is the same,
OS-sheets are mechanized to achieve
high quality.

【OS-sheets at a factory】
The lower waterproof ventilation<Construction details>
sheet and the upper layer of tarpaulin are bonded together at the factory. A tarpaulin consisting of an integrated
lower waterproof ventilation sheet and❷ Upper layer waterproof
an upper waterproof sheet is attached
sheet
to the base, and the sheet joint part iswelded and bonded with a torch.

❶ Underlayer waterproof ventilation
sheet

By omitting the under-coating process
and reducing the torch area to 1/10, theburden on the operator and the environment can be greatly improved.
Reducing the process and torch area
can shorten the construction period.

<Ｑuality>
Quality is improved by mechanizing thelaminating process.

04

OS-sheets

02

ReassReliable design to prevent water from entering
urancethe sheet when applying the tarpaulin (O S - Z4 0 )OS-sheets (surface)

Keep
out
water

OS-sheets (back)（Sandysurfaceside of OS-sheets)（Ventilation layer (Partial adhesive self-adhesive))

Protective Seal
Self-adhesive sealing part
Torch welding part

Torch welding part

Sand

Partial adhesive layer
0.394 in3.94 in

39.37 in3.94 in

Seal image of joint part of OS-sheets

39.37 inConstruction of side wraps (long-sided joints)
There is a 3.94 inch side wrap on the long side of the OS-sheets. Of these, 0.394 inch

OS-sheets

has a self-adhesive sealing part, and the remaining 3.54 inch is welded and bonded

OS-sheetswith a torch.

Protective Seal
(Self-adhesive sealing part)

When the sheet is attached, it is sealed with the red part (Protective Seal) in the ﬁgure,so it is possible to block the intrusion of rainwater into the sheet when it is attached.
P ro tec t i v e S e a l(Self-adhesive sealing part)

Torch welding part

Joints（Torch part）（Lower OS-sheets）（Upper OS-sheets）
0.394 inaeration

Safe even in sudden rain during construction

Side Wrap

Please take a look at the experimental
video to see if Protective Seal alone canprevent rainwater from entering.

Temporary closure with a protective seal
（Lower OS-sheets）

Self-adhesive part3.94 in（Upper OS-sheets）

Protective Seal prevents rainwater from entering.
OS-sheets

03

Reliability of sheet joints

Quality(O S - Z4 0 )ＵP!!
Joints（Torch part）

Integrated by joint weld bonding

Temporary closure
with a protective seal

Rather than joint bonding with adhesive layers or adhesives, the sheet joints areintegrated by thermal welding bonding with a torch.

Keep
out
ﬁre

（OS Hand Burner）

Since it is temporarily waterproofed with Protect Seal when OS-sheets are attached,（Lower OS-sheets）（Upper OS-sheets）

OS-sheets attachment and torch installation can be performed separately.
Therefore, the operator can concentrate on the torch work again after attaching theInsulation

OS-sheets. Alternatively, other workers can concentrate on the torch work, which improves the construction quality of the joints.
In addition, Protect Seal also prevents ﬂames from entering the inside of the OS-sheets,
so you can use the torch burner with peace of mind without burning the waterproof base.

05

Protective Seal prevents ﬂames from entering,so you can install with conﬁdence withoutburning the insulation

OS-sheets

04

Good forthe environment &peopleReduction of work time and consideration
for the environment (O S - Z4 0 )Tarpaulin to minimize ﬁre usage

Workability
ＵP!!

OS-sheets Bonding Image

Without torching the entire back surface of the tarpaulin, only

OS-sheets

the sheet joint part is melt joined.

OS-sheets

As a result, torch operations and CO2 emissions can be signiﬁcantly reduced (1/10).
Torch work with only the joints makes it possible to perform
waterprooﬁng work on a large area with a small torch burner(OS hand burner).

（OS Hand Burner）

Joints（Torch part）

Degassing cylinder that brings out
the best of OS-sheets

Deaeration System
for OS-sheets

Bottom surface

The degassing passage that continues from the ventilation layer is uninterrupted and degassing eﬃciently.

OS Degassing
SUS 304 stainless steel

The "OS Degassing Cylinder" isdevised so that moisture fromthe base is released to the outside
air without interruption throughthe degassing passage on the backof the OS-sheets.

Installed average calculation
1 ea. / 538.2~1,076.4 ft²

Size: Inner cylinder outer diameter Φ1.65 in
Size: h6.69 in ( Cap … 3.03 in × h5.51 in )Size: Board … 7.87 in × 7.87 in

Degassing cylinders that make the most of the features of OS-sheets,
which have both ventilation and waterproof layers
The protrusion of the self-adhesive part on the back of OS-sheets isused to create a degassing path.
The de-aeration path that runs over the entire back surface ofOS-sheets smoothly releases moisture to the outside air and prevents
the sheet from swelling．

【Structure of OS degassing】

Degassing system for OS-sheets seen from the backOS Degassing

Degassing passage

Degassing passage

Degassing passage

Degassing passage

OS Degassing
OS-sheets

OS-sheets
OS-sheets

Moisture

Base

Self-adhesive part

Degassing passage

Moisture06

De g as si n g ins ula tio n m e tho dMethod: OS-sheets ZT-40

Waterproof presser hardware
OS Seal (sealant)

Method: OS-sheets ZT40
Aeration
methodFlat area

Adhesion
methodRising part

Waterproof presser hardware

OS Seal(sealant)

OS Seal (sealant)

OS Topcoat

OS Topcoat

OS-M40OS-M40OS-Z40OS-Z40OS Primer・OS BaseOS Primer・OS Base

OS-T25(OS-JT25)

OS-T25(OS-JT25)

OS Primer

OS Primer

STEP 1OS Primer 0.04 lbs/ft²
OS Base0.16～0.24 lbs/ft²

OS Primer 0.04 lbs/ft²

STEP 2

STEP 3OS-Z40Cornerreinforcement

OS-T25OS-JT25

OS Topcoat 0.08～0.12 lbs/ft²
OS-M40

Products used
OS Primer07

OS BaseThe ground treatment material adheres
dirt and dust that cannot be removed
from the surface of the base to the baseand improves the adhesive strength of
OS-sheets. It is a solvent type with littleodor.

It is an organic solvent-based primer
active modiﬁer and has an excellent
conditioning eﬀect.

Speciﬁcation：35.2 lbs / steel canSpeciﬁcation：44 lbs / steel can

Solids：45%

Solids：75%

Dangerous goods
Solvent: Acetone, Xylene

OS-sheets

OS-Z40OS-sheets

OS-M40A hybrid modiﬁed asphalt tarpaulin witha striped self-adhesive layer on the backof the sheet, which functions as both aventilation layer and a waterproof layer.
Torch only the sheet joint parts.

Modiﬁed asphalt tarpaulin by torch method.
It is a type of sheet that torches the entire
back of the sheet.

JIS：A6013 Class R Class 2 for exposed
single layer

JIS：A6013 Class R Class 2 for exposed
single layer

Dangerous goods

Thickness：157 mil

Thickness：157 mil

Solvent: Asphalt ,Mineral Spirit

Length：3.28 ft × 22.97 ft

Length：3.28 ft × 26.25 ft※ Inhalation may cause poisoning,
so be careful of ventilation and ﬁre.

Exp o s e d ins ula tio n m e th od
Method: OS-sheets RD-Z40
Waterproof presser hardware

Finishing Paints

OS Topcoat

Corner reinforcement sheets

OS-M40Non-insulation zone

Asphalt Primer

OS-M40Insulation zone

OS-JT25

OS Primer

OS-Z40OS-JT25
OS BaseActivator for Base Material

OS Paste

Insulation adhesive

1
Rising partand concrete base part

OS Primer
0.04 lbs/ft²2Cornerreinforcement

OS-JT25

1Overlay part of the asphalt
waterprooﬁng layer

OS Base0.16～0.24 lbs/ft²

Insulation

2
OS Paste0.16 lbs/ft²

Joint Reinforcement Tape

3

4

OS-M40OS Topcoat
0.08～0.12 lbs/ft²

3

4

5

6

OS-JT25

OS-Z40OS Topcoat
0.08～0.12 lbs/ft²

Insulation+

Joint Reinforcement
Tape

OS-T25OS-JT25

OS Paste

OS Topcoat (No sand)

It is used for reinforcement.
It is constructed with a double-sided
torch.

It is used for reinforcement.
It is constructed by self-adhesive on thefront torch and back side.

Insulation glue. It is an adhesive consisting of special rubber asphalt and solvent.
It provides a strong bond between thebase and the insulation.

JIS：A6013 Class R Class 2 for
non-exposed multi-layer waterprooﬁng

JIS：A6013 Class R Class 2 for
non-exposed multi-layer waterprooﬁng

Speciﬁcation：39.7 lbs / steel canThis is an emulsion-type protective paintbased on acrylic resin used for exposure
waterprooﬁng.
It protects the waterproof layer, maintains
durability, prevents the temperature risedue to heat, and prevents the deteriorationof the waterproof layer due to ultraviolet rays.

Solids：65%

Speciﬁcation：39.7 lbs / steel canThickness：98.4 mil

Thickness：78.7 mil

Dangerous goods

Principal component : Acrylic emulsion

Length：3.28 ft × 26.25 ft

Length：3.28 ft × 26.25 ft

Solvent: Asphalt ,Mineral Spirit

Color : Grey & Green08

Compatible with various shapes!
Combination method of OS-sheets and O-PHALT (O-PHALT H )O-PHALT, a safe coating waterprooﬁng material based on modiﬁed asphalt,
is extremely compatible with OS-sheets.
Rising part-O-PAHLT Waterproof

OS-Sheets Ends-O-PHALT Waterproof■ Flat area part : OS-sheets ( OS-Z40 )■ Rising part : O-PHALT ( O-PHALT H )■ Flat area part : OS-sheets ( OS-Z40 ) ■ Rising part : O-PHALTH( O-PHALT )■ OS-sheets edge : O-PHALT ( O-PHALT H )OS Topcoat

OS Topcoat
H

O-PHALT(O-PHALT )+ O-PHALT Cloth

O-PHALT(O-PHALT H )+ O-PHALT Cloth

O-PHALT Primer

O-PHALT Primer

OS-T25 (OS-JT25)

OS-M40OS Primer・OS Base

OS-Z40OS-Z40OS Primer・OS Base

OS-T25 (OS-JT25)

OS-sheets / JIS A 6013（OS-Z40・OS-M40）
Test items（JIS A 6013）

Criteria

Long direction
Noprocessing Short direction

Tensilestrength
N/cm

After
heating

Long direction
Short direction

After alkali Long direction
immersion Short direction≧80≧ 80% ofNo processing
test valueLong direction
Noprocessing Short direction

TensileGrowth％Tensileproduct
N・％/cmAfterheating≧15

Long direction≧ 80% ofNo processingLong
direction
After alkali
test value
immersion Short direction
Short direction

Long direction
Noprocessing

Tensile strength N

Short direction
Long direction
Short direction

OS Seal≧2,500≧20

OS-Z40OS-M40

156
116
159
109
153
111
58
63
57
65
57
64

146
119
152
121
147
117
32
38
29
35
35
40

9,048

4,672

7,308

4,522

43
63

54
71

Refurbished Drain

Test items
Heat resistance
performance
Dimensional
stability
performance（JIS A 6013）

Criteria

OS-Z40OS-M40≦5
No drooping
and foaming

0
0
No
No
Appearance
abnormalities abnormalities
-0.1
- 0.1
Dimensional Long direction
0.0 ± 1.0
+0.3
+0.2change rate ％ Short direction
No abnormal wrinkles,
NoNo
warping,or delamin- abnormalities abnormalities
Appearance
ation
Drooping length mm

Bonding strengthN/cm

Dent-resistant performance
Fatigue resistance
Bending
resistanceNo processing
After heating

More than 50 ormore than 70% of theuntreated tensile strength in short directions

No holes

98

118

No
No
abnormalities abnormalities

NoNo
No cracks, splits
abnormalities abnormalitiesor breaks
No cracking
No
No
at 5℉
abnormalities abnormalities
No cracking
NoNoat 23℉
abnormalities abnormalities

О-PHALT Primer

О-PHALTIt is an asphalt emulsion type waterbased primer.
It is a material for good adhesion withthe base material.
It is suitable for asphalt-based waterprooﬁng materials.

This is an emulsion-type one-component
modiﬁed asphalt-based coating waterprooﬁng material made mainly of rubber
and asphalt.
Regardless of the shape of the substrate,
it forms a seamless waterprooﬁng layer.
It is an environmentally friendly waterproof
material that is safe for the human body anddoes not use ﬁre or solvents.

Vertical for Ф1.575 ～Ф3.937 inSince it is mainly made of special rubber
asphalt, it has excellent adhesion anddurability, and is used for places wherewatertightness is required, such as theend of OS-sheets, the end of pasting,drainage drains, and around pipes.

Horizontal for Ф1.181 ～Ф5.512 inSpeciﬁcation : 11.16 oz cartridge

Speciﬁcation：39.7 lbs / steel can

Solids：70%

09

Dangerous goods

Speciﬁcation：39.7 lbs / steel can

Solids：62 ～ 68 %Solvent: Asphalt, Xylene

Solids：18 ～ 22 %JIS A 6021 Rubber asphalt type

NETIS Registration No.KT-200118-VR
Workability

EconomySince the torch work area is as small
as 1/10,the burden on the operator
can be greatly reduced.

Environmental
Friendliness

Construction speed Up!

By mechanizing the sheet bonding
process, we were able to eliminate
one construction process, thereby
reducing costs.
Construction period can be shortened.

In these three respects, the "Hybrid modiﬁed asphalt tarpaulin construction
method(OS-sheets) " has been recognized as an inventive step and has beenregistered as a new technology in the Ministry of Land, Infrastructure,
Transport and Tourism's "NETIS".
This method, which has been registered as NETIS, has brought about an epochmaking change in each process of the "ASI-T1 for Exposed Roof Insulation andInsulation Insulation" and "AS-T3 for Exposed Waterproof Insulation Method"in the Ministry of Land, Infrastructure, Transport and Tourism's Standard Speciﬁcations for Public Building Works.

25 ％
31％
Cost reduction

With OS-sheets, you can check the bonding status results at a glance.
Construction management is easy!

Point

OS-sheets make they easy to lay sheets.
Reliable design to prevent water from entering
the sheet when applying the tarpaulin.

We compared the conventional construction
method and the process.
◆ Roof Exposed Waterprooﬁng Insulation Insulation Method Process (ASI-T1)
ASI-T1 (Conventional construction methods)
Process

Materials & Construction Methods

ASI-T1 ( OS-sheets )Process

Materials & Construction Methods

１

Primer coating

１

Primer coating

２

Insulation

２

Insulation

３

Modiﬁed asphalt sheet with partial
adhesive layer

３OS-sheets Z40

４Modiﬁed Asphalt Sheet

４

Finishing paint painting

５

Finishing paint painting

Cutting
the process

In the two processes of the red frame,

construction method of " Hybrid mo-◆Roof Exposed Waterprooﬁng Insulation Method Process (AS-T3)
AS-T3 (Conventional construction methods)

Materials & Construction Methods

Point!!

the inventive step of the

Method：OS-sheets RD40

Process

This is the

AS-T3 ( OS-sheets )Process

diﬁed asphalt tarpaulin OS-sheets"
was recognized, and it was registeredas a new technology in "NETIS".

Materials & Construction Methods

１

Primer coating

１

Primer coating

２

Modiﬁed asphalt sheet with partial
adhesive layer

２OS-sheets Z40

３Modiﬁed Asphalt Sheet

３

Finishing paint painting

４

Finishing paint painting

Cutting
the process

NETIS Registration No.

KT-200118-VR

Method：OS-sheets ZT40

■ Roof Exposed Waterprooﬁng Insulation Method Process 【 AS-T3 (Torch method) 】
Hybrid modiﬁed asphalt tarpaulin OS-sheets method【ZT40 method】

Conventional construction methods
Special rubber asphalt sealant
Waterproof presser hardware
Corner reinforcement sheets

Finishing Paints

Special rubber asphalt sealant
Waterproof presser hardware
Corner reinforcement sheets

Upper layerwaterproof
sheet
Underlayerwaterproof
ventilation sheet
Asphalt Primer
Joint Reinforcement Tape

Finishing Paints

OS-Z40Asphalt Primer
Joint Reinforcement Tape10