The Masonry and Brick Plaster System is a specification for Specialized's proprietary solid plaster system which can be used over a solid backing of concrete masonry, clay brick veneer, in-situ concrete or pre-cast concrete.
The plaster system consists of either the cement-based option of a minimum 4 mm thick base coat of Masonry Levelling Compound plaster, followed by a selection of cement based finishing plasters or Baumit acrylic finishing plasters. Or the Powafelx acrylic option of a flanking coat of Masonry Levelling Compound, followed by a mesh coat of Powaflex acrylic plaster and a Baumit acrylic finishing plaster. Both base coat options are finished with an acrylic exterior paint system.
Scope of use
The MLC Masonry and Brick Plaster System is suitable for buildings:
- with substrates of concrete masonry, in-situ or pre-cast concrete up to 3 storeys, with a maximum height from ground to eaves of 10m; and
- with substrates of clay brick veneer in accordance with the scope limitations of NZBC E2/AS1, NZS 4210 and NZS 4229; and
- with floor plan area limited only by seismic and structural control joints; and
- with supporting structures in accordance with the NZBC; and
- detached and located one metre or more from the relevant boundary; and
- situated in NZS 3604 Wind Zones up to and including Extra High
This system must not be used in situations where water may pond. A minimum slope of 10° is required on all sills and copings.
New Zealand Building Code (NZBC)
The product will, if employed in accordance with the supplier's installation and maintenance requirements, assist with meeting the following provisions of the building code:
- Clause B2 Durability: Performance B2.3.1(b), B2.3.1(c)
- Clause E2 External moisture: Performance E2.3.2
- Clause F2 Hazardous building materials: Performance F2.3.1
The masonry/brick substrate must be installed in strict accordance with the manufacturer’s specifications and recommended installation procedures.
All pointing shall be flush finished. The manufacturers required
curing time must be allowed after placement of the bricks to ensure all of the pointing has completely cured and the walls have stabilised.
Plastering cannot commence until; all the surfaces that are to be coated are level. All the necessary waterproofing elements must have been completed and checked and the joinery must be in place.
See the Masonry & Brick Plastering specification document
for full installation requirements.
The wall cladding system should be regularly cleaned, at least annually, by washing with clean water to remove dirt and to maintain the finished appearance. Grime may be removed with warm water and detergent.
Plastered wall should be recoated with either Plastershield or another approved paint system at 5 to 8 yearly intervals or sooner if required to maintain watertightness. Regular checks, at least annually, must be made of the system to ensure that the weather resistant coating is maintained watertight, and that the sealant, flashings, and other joints continue to perform their function and do not allow water to penetrate. Failure to correctly maintain the system may void any long-term warranties offered with the system. Any accidental damage to the cladding must be repaired immediately using Specialized Construction Products materials.