Installation of your Anti-Flood Airbricks (also found in the installation guides)
Note: Allow approximately 30-60 minutes per airbrick
Step 1: Locate the airbrick(s) to be replaced. Prior to installation, temporarily remove the screw (don't lose it!) & face cover. Remove the documents, sticker and check the closing valve is clipped in position & functioning correctly. Refit the face cover and screw.
Step 2: Using the necessary drill bit (masonry), drill multiple pilot holes around the mortar of the brick(s).
Step 3: Using a hammer drill or chisel, carefully break away the airbrick & remove all debris. Ensure there is no remaining mortar to restrict installation. You can do this by offering the airbrick temporarily in position.
Step 4: Clean out the aperture, water or SBR can be used to clean & prime the area, as the new cement will bond better. Note: SBR can cause mild staining so take care - & take care not to get the face of the bricks wet, as this make pointing more difficult.
Step 5: As neatly as possible, cement your airbrick in position, with even, full beds & perps - & with the correct mix (typically 1 part cement to 4 parts soft sand). Your airbrick has ridges at the rear to help stop cementing being pushed out the back. This stage is very important so take time & care - as water will find any entry.
Step 6: Clean off any 'snot's or bleeding cement, ensuring a neat finish. Take note of the airbricks serial number & removed the face sticker. You are finished!
Some important side notes
β’ Ensure that the mortar is completely dry before removing the face screw & face plate for future maintenance inspections. (typically 7 days)
β’ Double (or triple) airbricks can be replaced with two (or three) airbrick replacements placed one on top of the other, & aligned with the mortar joints of the two (or three) courses of bricks.
β’ The 8mm lip on the bottom rear edge of the brick can be removed using a hack saw to ensure the top brick sits comfortably above the lower brick.