The patented grate in the High Performance Bushfire Weepa is designed so that under extreme heat from bush fires it doesn't melt. Instead, it chars and retains its structural integrity. The stainless steel mesh is retained in situ protecting the cavity from fire brands and sparks. Mesh specifications: T304 grade stainless steel woven mesh, wire aperture 0.415mm, wire diameter 0.22mm.
CSIRO Technical Assessment No 350 - extract
"The High Performance Bushfire Weepa is suitable for installation in Bushfire Attack Levels BAL-LOW, BAL-12.5, BAL19, BAL-29, BAL-40 as defined in AS 3959-2009 and is also suitable for installation in Bushfire Attack Level BAL-FZ when a minimum setback distance of 10 m from the classified vegetation is achieved."
Install the Weepa between bricks or blocks, at specified intervals and firmly in contact with the flashing. For rendering, set out a few millimetres.
When rendering, the Weepa needs to be loosened in the masonry so the renderer can adjust the Weepa in and out. Grab internal rib to adjust Weepa in and out.
After clean up, use a small, flat screwdriver to prise the mortar cover up at the bottom.
The High Performance Bushfire Weepa has a specially formulated grate (with stainless steel mesh set behind) which chars and self extinguishes.
Make sure the new Weepa is installed when the masonry wall is built.
Loosen the Weepa and pull out proud of masonry.
Lay on render around the Weepa.
Screen off around the Weepa.
Pat the Weepa flush with the surface.
Float around the Weepa.
For easy removal later, wipe the mortar guard clean now, then again after painting.
After finish and cleanup remove the mortar guard for beautiful weepholes.
Mark the outline of the weep hole on each board at recommended centres and between each batten, then cut out with a jab saw.
Fix board as recommended by supplier.
Attention: Weepa does not encourage cutting out weep hole after fixing as this could compromise the waterproof membrane.
Check Weepa depth at back to ensure adequate clearance of studs and flashing.
Ventilation must not be impeded
If necessary, cut the back off the Weepa and remove dags.
Apply recommended glue to Weepa and push into weep hole slot so it acts as formwork for coating or finish.
Smooth off excess glue. Allow to dry.
Apply render or coating.
Screed as desired.
Sponge as required.
Clean the Weepa cover of excess render, finish and paint at each stage.
After final finish and clean up remove cover.
End result: beautiful and functional Weepa weep holes!