PART 1. GENERAL
1.1 DESCRIPTION
.1 Work included: The work described
in this section includes the supply and installation of the Exterior
Insulation and Finish System, as indicated on the drawings and as
specified. .
2 Related Work Under Other Sections:
STEEL STUDS AND FURRING: Section EXTERIOR GYPSUM SHEATHING BOARD:
Section SEALANTS: Section (See Note 3)
1.2 QUALIFICATIONS
.1 The Exterior Insulation and Finish
System shall be installed by a Contractor approved and certified by
the system manufacturer. Certification must be in force at the time
the project is bid and contracted for.
1.3 SUBMITTALS
.1 Submit to the Architect, for approval,
duplicate samples of finish coating of color and texture selected
by the Architect. Samples shall be made by applicator utilizing
tools, materials, and techniques proposed for installation.
.2 Obtain Architect's approval of samples
before ordering materials and proceeding with work.
1.4 PRODUCT DELIVERY, STORAGE AND
HANDLING
.1 Store packaged materials in original
containers with manufacturer's seals and labels intact, with each
production lot identified by batch number. All lots with same batch
number shall be stored together.
.2 Prevent damage to materials during
handling and storage. Keep materials under cover and free from dampness.
.3 Store products in a cool, dry place
out of direct sunlight, protected from the elements and from damage.
.4 System materials shall be stored
at a temperature of not less than 5°C (40°F).
1.5 JOB CONDITIONS
.1 Ambient temperature must be no
less than 5°C (40°F) during installation and until
the adhesive and coatings are dry (minimum 24 hours).
.2 Construct proper free standing scaffolds
460 mm (18") from the wall surface to allow continuous uninterrupted
application.
1.6 PROTECTION
.1 Protect adjacent areas from damage
resulting from the installation of the system. All finish work shall
be protected at the end of the day or completion of a section.
.2 Sections of the work must be protected
from adverse weather conditions during the application and until
the coatings are dry.
PART 2. PRODUCTS
2.1 MATERIALS
.1 Exterior Insulation and Finish
System: The system shall be as manufactured and supplied by Preswitt
Manufacturing Ltd., and comprised of insulation board, adhesive
compound, reinforced basecoat and acrylic finish.
.2 Insulation Boards: Shall be Preswitt
Mineral Wool Board with a nominal density of 8 lbs/cu.ft. Thickness
shall be as indicated on the drawings.
.3 Adhesive Compound: Shall be Preswitt
Adhesive Compound.
.4 Reinforcing Fabric: Shall be a balanced,
openweave glass fibre fabric, treated for compatibility with the
system materials. Fabric shall be supplied by Preswitt Manufacturing
Ltd.
.5 Heavy Duty Reinforcing Fabric: Shall
be balanced, openweave glass fibre fabric treated for compatibility
with the system materials and used in high impact areas only. Fabric
shall be supplied by Preswitt Manufacturing Ltd.
.6 Basecoat: Shall be Preswitt N.C.
Basecoat in 25 kilo bags.
.7 Portland Cement: Type 10 Normal
Portland Cement conforming to CSA A5-1977 or Type 1,1-11, or 11
meeting ASTM C150.
.8 Mechanical fasteners if required,
shall be as recommended be Preswitt Manufacturing Ltd.
.9 Primer: Shall be Preswitt Acrylic
Superbond reduced 50/50 with water before application.
2.2 MIXING AND PREPARATION
.1 Adhesive Compound: Drill-mix with
Portland Cement in a ratio of 1:1 by weight.
.2 Basecoat: Add 6 Litres of water
by weight to each 25 kilo bag of N.C. Basecoat and mix to a trowelable
consistency.
PART 3. EXECUTION
3.1 INSPECTION
.1 Before commencing ensure that environmental
and site conditions are suitable for the installation of the system.
.2 All areas, to receive the system
shall be sound, flat, even and free from irregularities.
.3 The substrate shall be a type approved
by Preswitt Manufacturing Ltd.
.4 Where exterior gypsum sheathing
is the specified substrate, ensure that it meets the required standard,
is clean, dry, properly fastened and shows no sign of deterioration
or defects.
.5 Wall surfaces shall be free of ice
and frost.
.6 Ensure that all surfaces are free
from loose particles, foreign materials, form oil and traces of
any other releasing agents. Any discrepancies shall be reported
to the Architect or General Contractor, and rectified before the
work proceeds. Commencement of work indicates acceptance of conditions.
3.2 INSTALLATION
.1 Using a 3/8" notched trowel
apply the Adhesive Compound to the back of the insulation in a horizontal
manner.
.2 Press and secure the Insulation
Board onto the wall surface.
Ensure solid contact. Boards shall be placed from a level baseline
with vertical joints staggered and all joints butted tightly. Boards
shall be flushed and the insulation wall surface left flat and even.
Mechanical fasteners, if required, will be spaced as directed by
the engineer.
.3 Evenly apply the specified Basecoat,
2 mm (1/12") thick, to the exposed surface of the insulation
board .
.4 Embed the Standard Reinforcing Fabric
in the wet Basecoat, lapping the joints a minimum of 60 mm (2.1/2");
trowel smooth leaving no mesh visible. For high impact areas Heavy
Duty Reinforcing Fabric shall be embedded in a Basecoat layer in
a similar manner; the fabric shall be butt-jointed, with no laps,
and allowed to dry for at least 24 hours. This shall be done prior
to installing the Standard Fabric reinforced Basecoat. Both reinforced
Basecoats are necessary for high impact areas. The surface to receive
the finish material shall be flat and even in all directions with
no high points especially at mesh laps.
.5 Apply Finish Coating with a steel
trowel and obtain texture by use of a plastic trowel. Coverage shall
be in accordance with the manufacturer's instructions.
.6 Installation of the Exterior Insulation
and Finish System shall be done in strict accordance with the contract
documents, and the manufacturer's written instructions. The finished
work shall match approved samples, be uniform in colour, texture
and be free from defects detrimental to appearance and performance.
SPECIFICATION NOTES
1. This guide specification is basic
and must be adapted to suit the requirements of individual projects.
Consult the manufacturer for specific recommendations.
2. This guide specification is prepared
in accordance with Construction Specifications three part section
format and should be included under Division 7 - Thermal and Moisture
Protection as Section 07240, in accordance with CSC/CSI Master Format
for specifications.
3. Insert list of related work specified
in other Divisions, such as steel studs, exterior gypsum sheathing,
sealants, flashings, etc. Sealant compounds should be compatible
with Preswitt Wall System components. Insert also the appropriate
section number.
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