MULTI-TEX STUCCO SYSTEM ®
U.S. Patents No. 5,732,520 & No. 6,516,580
Fire Retardant Weather Resistant Exterior System
I. DESCRIPTION and SCOPE
The MULTICOAT MULTI-TEX STUCCO SYSTEM ® consists of high build flexible Synthetic Latex emulsion applied to a special non-combustible lightweight autoclaved cementitious wall board. It forms a cost-effective, durable weather-resistant exterior stucco finish wall, installed on wood or steel frame, residential or commercial structures.
The scope of this specification is to describe all materials and installation procedures for the MULTI-TEX STUCCO SYSTEM.
II. MATERIALS
1. MULTI-TEX STUCCO MIX COATING
As manufactured by MULTICOAT CORPORATION
Shall be a high build waterbase flexible synthetic latex combined with various sand fillers to obtain desired coating texture.
Physical properties of the cured coating shall meet or exceed the following test criteria:
STUCCO MIX
| TEST | METHOD | RESULTS | ||
| 1. | 2000 Hour Weatherometer | ASTM G23 | No marked evidence of
surface cracking, blistering, flaking, chalking, crazing or any other deleterious effects observed |
|
| 2. | Moisture Resistance | ASTM D2247 | No blistering or cracking of surface | |
| 3. | Freeze-Thaw | Section VI D of acceptance criteria for EIFS |
No change in color, no
cracks, no crazing, no delamination |
|
| 4. | Abrasion Test (Falling Sand) | ASTM DE968 Method A | Initial wear started at 3200 liters | |
| 5. | Fungus | Mil-Std-810B (Method 508) | Passed | |
| 6. | Moisture Vapor Transmission | ASTM E96 | 4.56 Perms, the coating is not a vapor barrier | |
| 7. | Mildew Resistance | Fed. Spec. 6271 | Passed | |
| 8. | Salt Spray Resistance | ASTM-B117 | Passed 18 cycles | |
| 9. | Wind Driven Rain Resistance | TTC-555b | Passed 24 hours | |
| 10. | Fire Hazard Classification | ASTM E-84 | Fuel contribution -0, smoke development -5, Flame spread -10. |
|
2. CEMENTITIOUS WALL BOARD - As manufactured by MAXI-TILE, INC.
Shall be a fiber cement board, Maxi Panel or approved equal.
Physical properties of cementitious wallboard shall be equal to or exceed the following criteria:
CEMENTITIOUS WALL BOARD
ICBO / ES Report #5139 |
SBCCI Report #9556 |
||||
| 1. | Thickness: | ¼", 5/16", 7/16" | 1. | Thermal Resistance: | R=0.17 |
| 2. | Installed Weight: | 2. | Shrinking: Ambient to oven-dry | 0.06% | |
| ¼ " Thick - | 1.9 lb./sq.ft. | 3. | Swelling of Thickness: | 0.2% | |
| 5/16" Thick - | 2.4 lb./sq.ft. | 4. | Flame Spread: | 0 | |
| 7/16" Thick - | 3.3 lb./sq.ft. | 5. | Smoke Density: | 0 | |
| 3. | Density: | 86 lb./cu.ft. | 6. | Wind Pressures* | |
| 4. | Bending Strength: | 7. | Shear Values* | ||
| Transversal - | 2,000 psi | ||||
| Longitudinal - | 2,500 psi |
*For further technical data on fiber cement, please refer to Maxitile’s "Maxipanel" literature.
3. ELASTOMERIC JOINT TAPE - As manufactured by MULTICOAT CORPORATION
Shall be synthetic grey adhesive / sealant backed by special synthetic fabric.
Physical properties of Joint Tape shall be in accordance with the following specifications:
ELASTOMERIC JOINT TAPE
| 1. | Appearance: | Grayish white fabric with gray adhesive / sealant |
| 2. | Bonding Time: | Immediate aggressive grip - 24 hr. full bond |
| 3. | Backing: | Polyester fabric 2 mil |
| 4. | Adhesive: | "The Gray Matter" 11 mil |
| 5. | Temperatures: Application - Operating Limits - |
30¡ F to 110¡ F 10¡ F to 180¡ F |
| 6. | Low Temperature Flexibility: | Passes / No Cracking |
| 7. | Tensile Strength: | 570psi (with 75% elongation) |
| 8. | Shelf Life: | 18 months to 2 years |
| 9. | Peel Strength: | 5 lb. per linear inch |
| 10. | Water Resistance: | Excellent - Surface must be dry before application. |
III. SURFACE PREPARATION
Wall board and supporting framework must be structurally sound, and surface must be free from grease, oil, paint, dirt, dust, sealers, laitence, and other foreign materials that may PREVENT PROPER BONDING. Proper expansion joints should be installed according to applicable local building codes. (Recommended: Approximately every 16 feet when wall has no openings.)
IV. APPLICATION
1. STEP 1
Install cementitious wall board panels on existing structure using galvanized nails (wood) or self-tapping ceramic coated screws (steel), 6" centers. Leave minimum 1/8" space between panels (refer to available sketches and manufacturer’s instructions for recommended installation detail). Caulk all joints with polyurethane caulk. Allow caulk to thoroughly cure. Tape all caulked joints with Multicoat elastomeric 3" joint tape. Use 6" joint tape on all corners. Refer to diagrams on Application Specification Flyer.
2. STEP 2
Clean wall board with water-dampened sponge. Leave slightly damp. Immediately apply Multicoat MULTI-TEX STUCCO MIX directly to wall board with trowel or sprayer, and finish to desired texture.
3. STEP 3
Caulk expansion joints after application and cure of MULTI-TEX STUCCO MIX.
NOTE: For installation instruction details, please refer to Application Specifications.
V. WARNING
Do not apply if wall board surface temperature is below 50oF, or over 100oF., if ambient temperature is less than 50oF and falling, over 100oF and rising, or if precipitation or extreme high humidity is expected within a 12-hour period.
VI. WARRANTY
Materials are guaranteed with respect to uniformity and quality within manufacturers’ specifications. Seller makes no other warranty, expressed or implied, regarding the use of its products. Since use of the product is beyond the Seller’s control, the Buyer assumes all risks of use. Seller’s sole obligation shall be to replace material if found to be defective. Seller shall not be liable for any damages, injury, loss, direct or indirect or consequential, resulting from use of its products.
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