2.21 Check and Prepare Magnesium Board Substrates
Preparation based on new substrate installations.
Magnesium Board Substrates – please refer to substrate manufacturers installation instructions.
Vermin proofing track supplied and installed by main contractor as per magnesium board manufacturer instructions where a cavity wall system is being used. The vermin proofing track can be manufactured from uPVC, aluminium or stainless steel and must be punched with 3-5 mm holes or slots complying with NZBC Acceptable Solution E2/AS1, Paragraph 18.104.22.168 to provide ventilation openings of 1000 mm2 per lineal metre.
Other flashings may be required as determined by the substrate supplier.
2.3.2.Builder Supplied Flashings
Make sure all builder supplied flashings are in place. (Refer to Rockcote TradeSpec™ document 3.2 Builder Supplied Flashings) for a list of possible builder supplied flashings.
2.3.3.Rockcote Flashing Installation
Refer to the flashings as outlined within the Rockcote RenderSpec™ section 5 and refer to their installation procedures in Rockcote TradeSpec™ document 3.1 Rockcote Flashings
2.3.4.Control/Expansion Joint Set outs
All control joints are the responsibility of the main contractor / substrate installer. Control joints must comply with the substrate supplier’s specifications.
for more information about control joints refer to TradeSpec™ Document 1.4 – Control Joints
When the substrate has been left for a period of time, dust and dirt may build up on the surface. This contamination must be removed prior to render application.
Before application of Render, apply masking to all joinery, pipes, roofs and all areas likely to be marked by the Render. Use drop cloths and ground covers to keep the working areas clean.
For further information on Light Reflectance Values (LRV) refer to TradeSpec™ Document 1.6 – Light Reflectance Values