09 25 13 - ACRYLIC PLASTERING.pdf

MINISTRY OF HOUSING Western Sector Projects Sitework & Infrastructure OMRANIA and ASSOCIATES Project Specification

ACRYLIC PLASTERING SECTION 09 25 13 - 1

SECTION 09 25 13

ACRYLIC PLASTERING PART 1: GENERAL

1.01 SECTION INCLUDES

A. Through coloured acrylic render system applied to external substrates giving water repellant coating to external walls.

1. Accessories including reinforcing coat, mesh for additional reinforcement and aggregate.

1.02 RELATED SECTIONS

A. Section 03 30 00 Cast in Place Concrete.

B. Section 04 20 00 Concrete Masonry Unit

C. Section 07 42 13 Metal Wall Panel.

D. Section 07 62 00 Sheet Metal Flashing and Trim.

E. Section 07 92 00 Joint Sealers.

F. Section 08 11 00 Steel Doors & Frames.

G. Section 08 51 13 Aluminium Windows.

H. Section 08 91 00 Louvers.

1.03 REFERENCES

A. ASTM D 2247 Standard Practice for Testing Water Resistance of Coatings in 100% Relative Humidity.

B. ASTM E 96 Standard Test Method for Water Vapor Transmission of Materials.

C. BS 8000:Part 10 Code of Practice for Workmanship on Building Sites.

1.04 SYSTEM DESCRIPTION

A. System: complete render systems with 100% acrylic reinforcing and finish coats with no cement added either at the factory or on site.

B. Render system to accommodate a minimum expansion movement of 2.75% before cracking.

C. Render system surface to withstand a minimum impact energy of 5 joules before visible damage.



1.05 QUALITY ASSURANCE

A. Comply with the Clause BS8000: Part 10, which are relevant to this section.

B. Materials and work shall conform to applicable provisions of the latest edition of relevant reference standards and all applicable codes and requirements of local authorities having jurisdiction, whichever are more stringent.

C. Uniformity Of Colour And Texture: Once samples of coatings have been approved, do not change type or proportion of constituent materials. Ensure that supplies and batch numbers of materials are sufficient and consistent to give uniformity of colour. Ensure uniformity of texture during application. In hotter, sunnier climates it is recommended to have a finish coat colour with an SRI above 30%.

D. Mix Proportions: Except where stated otherwise all mixes should be in strict accordance with manufacturers instructions.

E. Admixtures: Do not use any admixtures. Under no circumstances should cement be added on site to the 100% acrylic base and finish coats as this can induce shrinkage cracking, moisture ingress, thermal bridging and possible delamination.

F. Qualifications:

1. Manufacturer Qualifications: Company regularly engaged in the production and erection of the type of work specified herein with not less than fives years of documented experience.

2. Installer: Company specializing in performing work of this section with minimum five years documented experience.

G. Scaffolding: Use independent scaffolding to avoid putlog holes and other breaks in coatings.

1.06 SUBMITTALS

A. Comply with the provisions of Section 01 33 00.

B. Shop Drawings: Submit shop drawings for each type of finish including but not limited to the following:

1. Shop drawings showing locations of work in the project, elevations and profiles. Indicate materials, sizes, shapes, thicknesses, and finishes; including provisions for thermal movement and connection to other work.

2. Submit large-scale details of edge conditions, joints, corners, custom profiles, supports, anchorages, trim, flashings, closures and special details.

3. Any deviations from design as shown on the Drawings and/or materials specified shall be clearly indicated on shop drawings and shall be subject to the review and approval of the Engineer prior to application.

C. Samples:

1. Submit samples of wall areas, being part of the finished work, in approved locations as follows, and obtain approval of appearance before proceeding: 2m of each type.

Samples to be the sole responsibility of the applicator and an allowance should be made for the cost of materials etc.



2. Samples shall be fully identified, labeled and shall show extremes in variations of finishes.

3. Submit manufacturers color chart.

D. Product Data: Submit manufacturer's latest published literature for materials specified herein for approval. Obtain approval before delivering materials to the project site.

E. Test Data: Submit certified laboratory test reports for the performance tests specified in this Section.

1.07 DELIVERY, STORAGE AND HANDLING

A. Comply with the provisions of Section 01 61 00.

B. Exercise proper care and protection in the delivery and handling of all work so as not to injure finished surfaces and take proper precautions to protect the work from damage after it is in place.

C. Store off the ground, in a dry, protected ventilated space. Protect all materials from detrimental conditions.

1.08 JOB CONDITIONS

A. Protect work from weather, stains, soil, deterioration and damage of all kinds, until completion of the project. Sprayed-on, strippable coatings shall not be used.

B. Damaged or Unsatisfactory Work: Remove from the project and replace with new work at no additional cost to the Owner.

1.09 WARRANTY

A. Comply with Section 01 78 36.

B. Provide manufacturers 10 year warranty for finishing system from Substantial Completion against fading, chipping, cracking, peeling, blistering, alligatoring or crazing. Materials showing evidence of such failure shall be removed and/or replaced during the warranty period, at no additional cost to the Owner. Repair work shall be performed to the satisfaction of the Engineer.

PART 2: PRODUCTS 2.01 RENDER SYSTEM TO EXTERIOR

A. Materials:

1. Location: see drawings

2. Background: Cast in place & masonry concrete surfaces.

3. Preparation: Ensure surface is sound and free from deleterious matter and shutter grease.

4. Anti-Algae/Fungal primer (if required.): fungicidal wash applied in accordance with manufacturers instructions. Do not wash off.



5. Priming coat: mixed with 20% OP Cement and applied in accordance with manufacturers instructions.

6. Levelling coat (if required

7. Reinforcing coat: cement free, fibre reinforced acrylic mesh coat. The finished thickness of the mesh coat shall be such that the reinforcing mesh is fully embedded - ca. 3mm.

.): to achieve a smooth level surface as necessary.

8. Reinforcement:

i. Adhesion to concrete: 0.93N/mm.

ii. Flexural strength: 2.2% expansion at 2200N/50mm

9. 100% acrylic reinforcing render coat should comply with the following minimum criteria:

i. Density to EN ISO 2811 = 1.5 - 1.7 g/cm

ii. Diffusion-equivalent air layer thickness to EN ISO 7783-2 0.4 - 0.6 m, V2 medium

iii. Water permeability rate w to EN 1062 -3 = 0.03 kg/(m*h0,5), W3 low

iv. Water vapour diffusion resistance factor to EN ISO 7783-2 = 160 - 240 V2 medium

v. Reaction to fire (class) to EN 13501-1 A2-s1, d0, Non-combustible B. Final coat

1. Cement free, pure acrylic render. Texture and colour to be advised. Thickness as per guidelines. In hotter, sunnier climates it is recommended to have a finish coat colour with an SRI above 30%.

i. Performance : Vapour permeability: Sd-Value 0.24m. Water Absorption W24

ii. Use QS grades below +5C

: 0.04kg/m.h0.5.

iii. Density EN ISO 2811 - 1.7 - 1.9 g/cm

iv. Diffusion-equivalent air layer thickness to EN ISO 7783-2 = 0.18 - 0.19 m,

v. Water permeability rate w to EN 1062 -3 = < 0.05kg/(m*h0,5), W3 low

vi. Water vapour diffusion resistance factor to EN ISO 7783-2 = 90 - 100 V2 medium

vii. Fire behaviour (class) to EN 13501-1 A2-s1, d0, Non-combustible

viii. Thermal conductivity to DIN 4108 = 0,7 W/(m*K)

2. Accessories: Stop Beads and PVC Mesh Angle Beads. Gun-applied sealant at window



reveals etc. 3. Under no circumstances should cement be added on site to the 100% acrylic base and

finish coats as this can induce shrinkage cracking, moisture ingress, thermal bridging and possible delamination.

4. For additional soiling resistance apply two coats of paint to the render surface in accordance with the instructions given in the technical data sheet. This will increase resistance to airborne contaminants and assist in prolonging both appearance and durability.

2.02 ACCESSORIES

A. Beads/Stops/Cills: Stop beads as recommended by manufacturer.

B. Corner Beads

1. External arras: Mesh Angle Bead.

2. Internal arras: Angle.

3. Provide beads/stops at all arras and stop-ends except where specified otherwise.

4. Cut neatly, form mitres at return angles.

5. Fix securely using the longest possible lengths, plumb, square and true to line and level, ensuring full contact of wings with background.

C. Sealants: Provide sealants as specified in Section 07 92 00.

D. Miscellaneous Items: Provide miscellaneous items as shown or as required for locations of use. Provide items best suited for intended use and compatible with contiguous materials.

2.03 PREPARING BACKGROUNDS

A. Keying/Bonding: Prepare background as specified for the type of coating to be applied. Where not specified, comply with BS800 Part 10 clause 2.2.2.2. Method other than those specified may be submitted for approval.

B. Dissimilar Solid Backgrounds: Where not shown on drawings, continue coatings without break across joints between dissimilar solid backgrounds. Reinforce with double layer of reinforcing mesh.

C. Movement Joints: Form joints in coatings to coincide with movement joints in background as per architects detail.

D. Conduits: Conduits must be chased into existing substrate prior to commencement of rendering.

E. In some cases concrete blocks will crack after application of the render, normally due to shrinkage. The amount of shrinkage and hence movement can be quite large and it is possible that it could overstress the render system, which could lead to cracking. In order to optimise the performance of the render, it is important that the block manufacturers recommendations are followed, particularly in respect of storage of blocks on site, provision



of movement joints and inclusion of bed joint reinforcement. Time must be allowed to let new block work fully cure prior to rendering.

PART 3: EXECUTION 3.01 INSPECTION

A. Make a thorough examination of all surfaces receiving the work of this Section and before starting the application. Start of work shall imply acceptance of conditions as satisfactory for the application of the work of this Section.

3.02 PREPARATION

A. Verify measurements and dimensions at the job site and cooperate in the coordination and scheduling of the work of this Section with the work of related trades.

B. Keying/Bonding: Prepare background as specified for the type of coating to be applied. Where not specified, comply with BS800 Part 10 clause 2.2.2.2. Method other than those specified may be submitted for approval.

C. Isolate galvanized metal from dissimilar metals, masonry, concrete, and wood by coating with bituminous mastic paint specified herein.

3.03 APPLICATION

A. Set work accurately in location, alignment and elevation, plumb, level and true, measured from established lines and levels. Provide temporary bracing or anchors in formwork for items which are to be built into concrete, masonry or similar construction.

B. Comply with material manufacturers instructions and recommendations for installation, as applicable to project conditions and supporting substrate.

C. All installations of materials shall be performed by applicators approved by manufacturer.

D. Under no circumstances shall any of the products be altered with any additives, except for small amounts of clean water as directed on the label. Antifreeze, accelerators, rapid binders, etc., are forbidden.

E. The surface to receive the render shall be clean, dry and sound.

F. Apply the surface preparation material appropriate to the substrate as previously described.

G. Establish a horizontal line at the base of the substrate. Install a stainless steel or PVC render stop bead of appropriate width bedded in the reinforcing render and allow to set.

H. The reinforcing plaster shall be stirred with a mechanical mixer to a uniform consistency. A small amount of water may be added to aid workability. Apply a reinforcing coat over the levelled substrate using a stainless steel trowel to a uniform thickness of approx. 3mm. Work horizontally or vertically in strips of 1m, and immediately embed the mesh into the wet reinforcing coat. Avoid wrinkles in the mesh. The finished thickness of the reinforcing coat shall be such that the mesh is fully embedded. Where the substrate is such that multiple coats are required the mesh is applied only in the final reinforcing coat. Allow the reinforcing coat to dry thoroughly before applying the finish. External angles may be treated in either of two methods dependent on site conditions:



1. a pre-formed PVC angle bead 2.50m long, bonded to a 250mm wide strip of mesh, bedded in reinforcing coat plaster at all external corners prior to application of the main area reinforcing mesh, which is subsequently applied up to, but not around, the external corner.

2. a pre-formed glass fibre reinforcing strip 160mm wide overall, bedded in reinforcing coat plaster at all external corners prior to application of the main area reinforcing mesh, which is subsequently applied up to, but not around, the external corner.

I. Expansion joints the render system does not require control or expansion joints except where the substrate has:

1. An existing control joint, expansion joint, or live building crack

2. Where the system is applied to dissimilar substrates.

These joints shall extend through the render system and shall be formed using either:

1. stainless steel or PVC render stop beads bedded in levelling render either side of expansion joint. Levelling, reinforcing and finish plasters worked to beads both sides of joint. Joint gap shall be primed and filled with gun applied sealant.

2. proprietary expansion joint bead bedded in levelling render and allowed to set.

Levelling, reinforcing and finish renders worked either side of bead.

J. The acrylic or silicone resin finish shall be applied in a continuous application always working to a wet edge. Care should be taken to avoid texture changes at different levels. To prevent staining of the finish coating always ensure that the scaffold boards are free from dust before commencing application of the final coat.

K. If possible, entire sections or elevations should be coated in a single operation to avoid joint marks in the finish. Often this can be achieved by working to natural breaks in the building or changes in colour or texture. Where day-joints are unavoidable these should be made to coincide with natural features. Apply a masking tape at the desired position of the joint and apply the finish overlapping the edge of the tape. Carefully remove the tape while the finish is still wet to leave a fair edge. Once the finish material has set subsequent applications may be applied by masking the previously completed section with tape by carefully applying the new finish to achieve a barely visible joint. Weather conditions will be a factor in the application of the finish as well as the drying time. Finish may be applied over joints but not over expansion joints. Under no circumstances should cement be added on site to the 100% acrylic base and finish coats as this can induce shrinkage cracking, moisture ingress, thermal bridging and possible delamination.

L. For additional soil resistance apply two coats of manufacturers recommended paint to the

render surface in accordance with the instructions given in the technical data sheet. This will increase resistance to airborne contaminants and assist in prolonging both appearance and durability.

3.04 CLEANING AND PROTECTION

A. Comply with Section 01 77 00.

B. Specified products are water based, therefore the normal conditions for working in winter and during periods of inclement weather should be adhered to during and after application.



Refer to the manufacturers Winter Working Policy for advice on protection of finishes. Absorbent surfaces such as concrete, brick etc. may be affected by the render pigments, and where spillage is likely then these surfaces should be protected with the appropriate covering material.

C. Cleaning: Remove protective coverings and strippable films (if any) at time in project construction sequence which will afford greatest protection of work. Clean finished surface as recommended by manufacturer, and maintain in a clean condition during construction.

D. Projection: Installer shall advise Contractor of protection and surveillance procedures, as required to ensure that work of this section will be without damage or deterioration at time of Substantial Completion.

END OF SECTION

SECTION 09 25 13ACRYLIC PLASTERINGPART 1: GENERALPART 2: PRODUCTSAdhesion to concrete: 0.93N/mm.Flexural strength: 2.2% expansion at 2200N/50mm100% acrylic reinforcing render coat should comply with the following minimum criteria:Density to EN ISO 2811 = 1.5 - 1.7 g/cmDiffusion-equivalent air layer thickness to EN ISO 7783-2 0.4 - 0.6 m, V2 mediumWater permeability rate w to EN 1062 -3 = 0.03 kg/(m*h0,5), W3 lowWater vapour diffusion resistance factor to EN ISO 7783-2 = 160 - 240 V2 mediumReaction to fire (class) to EN 13501-1 A2-s1, d0, Non-combustibleB. Final coatUse QS grades below +5 CDensity EN ISO 2811 - 1.7 - 1.9 g/cmDiffusion-equivalent air layer thickness to EN ISO 7783-2 = 0.18 - 0.19 m,Water permeability rate w to EN 1062 -3 = < 0.05kg/(m*h0,5), W3 lowWater vapour diffusion resistance factor to EN ISO 7783-2 = 90 - 100 V2 mediumFire behaviour (class) to EN 13501-1 A2-s1, d0, Non-combustibleThermal conductivity to DIN 4108 = 0,7 W/(m*K)Corner BeadsExternal arras: Mesh Angle Bead.PREPARING BACKGROUNDSPART 3: EXECUTIONEND OF SECTION

09 25 13 - ACRYLIC PLASTERING.pdf

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