JC/T 1068-2008 English PDF (JC/T1068-2008)

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JC/T 1068-2008: Waterproof materials for pitched roof Underlayments of self adhering polymer modified bituminous
JC/T 1068-2008
JC
BUILDING MATERIAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 91.060.30
Q 17
Filing No.: 22938-2008
Waterproof materials for pitched roof - Underlayments of
self adhering polymer modified bituminous
ISSUED ON: FEBRUARY 01, 2008
IMPLEMENTED ON: JULY 01, 2008
Issued by: National Development and Reform Commission of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Categories ... 4
4 General requirements ... 5
5 Requirements ... 5
6 Test method ... 6
7 Inspection rules ... 10
8 Sign, packaging, transportation, storage ... 12
Waterproof materials for pitched roof - Underlayments of
self adhering polymer modified bituminous
1 Scope
This standard specifies the classification, requirements, test methods, inspection rules
and signs, packaging, transportation, storage of underlayments of self adhering polymer
modified bituminous, for waterproof materials for pitched roof.
This standard is applicable to the underlayments of self adhering polymer modified
bituminous waterproof underlayment (referred to as self-adhesive underlayment),
which is used under various tiles and other roofing materials, in pitched roof
construction projects.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For the dated references, the subsequent amendments
(excluding corrections) or revisions do not apply to this Standard; however, parties who
reach an agreement based on this Standard are encouraged to study if the latest versions
of these documents are applicable. For undated references, the latest edition of the
referenced document applies.
GB/T 328.8 Test methods for building sheets for waterproofing - Part 8: Bitumen
sheets for waterproofing-tensile properties
GB/T 328.14 Test methods for building sheets for waterproofing - Part 14: Bitumen
sheets for waterproofing-flexibility at low temperature
GB/T 328.18 Test methods for building sheets for waterproofing - Part 18: Bitumen
sheets for waterproofing-resistance to tearing (nail shank)
GB/T 328.20 Test methods for building sheets for waterproofing - Part 20: Bitumen
sheets for waterproofing-resistance to peeling of joints
GB/T 16777-1997 Test methods for building waterproof coatings
3 Categories
3.1 Type
The bitumen, which is used in the product, is completely self-adhesive polymer bitumen.
The upper surface material of the self-adhesive underlayment is generally polyethylene
film (PE), polyester film (PET), aluminum foil (AL), etc., without internal reinforcing
base.
The self-adhesive underlayment can also use other types of upper surface materials,
according to the manufacturer's requirements.
3.2 Specifications
The width specification is 1 m; the other width specifications shall be agreed upon by
both parties.
The thickness specification is not less than 0.8 mm.
3.3 Marking
It is marked in the order of product's main material name, tire base, upper surface
material, thickness, width, length, standard number.
Example: The waterproof underlayment, which uses self-adhesive polymer bitumen PE
membrane surface, has a thickness of 1.2 mm, width of 1 m, length of 20 m, is marked as:
Self-adhesive polymer bitumen waterproof underlayment PE-1.2 mm x l m x 20 m - JC/T
1068-2008
4 General requirements
The surface of self-adhesive underlayment products shall have anti-skid function,
which is conducive to the safe construction of personnel.
5 Requirements
5.1 Size deviation
The allowable deviation of width is ±3% of manufacturer's specified value.
The allowable deviation of the area is not less than 99% of the value specified by the
manufacturer.
The thickness shall not be less than 0.8 mm; the average thickness shall not be less than
the value specified by the manufacturer.
5.2 Appearance
lower end of the underlayment. Hang the aluminum plate vertically in an oven at (70 ±
2) °C for 24 hours. Measure the sliding distance of the test piece.
6.7 Flexibility at low temperature
Test according to GB/T 328.14; the diameter of the bending shaft is 20 mm. Take 10
test pieces in the longitudinal direction. Carry out test, with five upper surfaces and five
lower surfaces face outwards. If the surface of at least four of five test pieces has no
crack, this surface is qualified. If both surfaces are qualified, the test passes.
6.8 Peel strength
6.8.1 Underlayment and aluminum plate
6.8.1.1 23 °C peel strength
Refer to GB/T 328.20, to stick the underlayment test piece on the surface of a smooth
aluminum plate, that has been cleaned with a solvent. The bonding surface is
recommended to be 50 mm x 75 mm. One end of the aluminum plate is clamped into
the fixture. The underlayment at the same end is bent 180° and clamped into another
fixture. Carry out the test. Use the maximum force to calculate the peel strength, the
unit is N/mm. Take the arithmetic mean value of five test pieces as the test result.
6.8.1.2 5 °C Peel strength
Place the test piece and the aluminum plate at (5 ± 2) °C for 24 hours. Then bond them
at this temperature. Then place them at this temperature for 2 hours. Measure the peel
strength at this temperature.
6.8.2 Underlayment and underlayment
Test according to GB/T 328.20. The lower surface of one test piece is bonded to the
upper surface of another test piece.
6.9 Nail shank tear strength
Test according to GB/T 328.18.
6.10 UV treatment
Put the unbonded test piece into the ultraviolet box, that meets the requirements of 7.1.7
in GB/T 16777-1997. The exposed surface faces the light; the test piece is parallel to
the lamp tube, at a distance of 47 cm ~ 50 cm. The temperature of the space, which is
50 mm left and right of the surface of test piece, is (45 ± 3) °C. The irradiation time is
240 h. Take it out, to observe whether there is foaming, pulverization, cracks or
wrinkling on the surface of the test piece. Then carry out the test, according to 6.8.1.1.
The size of the test piece is 150 mm x 50 mm. The bonding surface is 50 mm x 50 mm.
6.11 Water tightness of nail shank
6.11.1 Preparation of test piece
Cut a sample of 300 mm x 300 mm. Remove the anti-adhesive material of the
underlayment, under the condition of (23 ± 2) °C. Place the underlayment lightly on a
plywood, which has a thickness of not less than 10 mm and the same size as the
underlayment. The edge of the test piece is pressed and bonded, so that the test piece
does not fall when it is erected. The underlayment is then tapped, to bond it to the
plywood.
Put two blocks of wood under the plywood for support, to make it easier to drive the
nails in. Drive two flange-less galvanized threaded roof nails, which have a length of
(30 ± 4) mm and diameter (3.5 ~ 4) mm, into the plywood from the surface of the
underlayment. The position is near the center of the specimen. The spacing between
nails is (25 ~ 50) mm. Drive the nail, until the nail cap is flush with the surface of the
underlayment. Then tap the nail head from the back, to lift the nail, so that the distance
between the nail cap and the underlayment surface is 6 mm.
A total of two test pieces are prepared.
6.11.2 Test procedure
Place a circular tube, which has a diameter of (150 ~ 250) mm and a height of not less
than 150 mm, in the center on the surface of the underlayment layer of the test piece,
which is placed horizontally. Then us...