Replacing a brick vent is a manageable DIY project that improves subfloor ventilation, helps reduce moisture build-up, and refreshes tired brickwork. Proper ventilation is important for preventing dampness and deterioration in older homes.
Step 1: Gather Your Tools & Materials
You’ll need:
- Brick bolster or cold chisel
- Hammer
- Brick trowel
- Pointing tool
- Wire brush
- Mortar mix
- Replacement brick vent
- Safety glasses, gloves, and dust mask
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Example Brick Vent
Terracotta Brick Vent (Australian Made)
Step 2: Remove the Old Brick Vent
Carefully chip away the mortar around the existing vent using a hammer and bolster.
Tips:
- Work slowly to avoid damaging surrounding bricks
- Remove mortar from the joints first
- If necessary, lightly score joints with an angle grinder
Once loosened, gently pull the vent out.
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Step 3: Clean the Opening
Use a wire brush and remove all loose mortar and debris.
The cavity should be:
- Clean
- Dry
- Structurally sound
A clean opening helps the new mortar bond properly. We also recommend removing loose mortar thoroughly before repointing.
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Step 4: Test Fit the New Vent
Insert the new vent without mortar first.
Check:
- Fitment
- Alignment
- Depth
- Level
The vent should sit flush with the surrounding brickwork.
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Step 5: Mix and Apply Mortar
Mix mortar to a firm consistency — not too wet.
Apply mortar around:
- Top
- Bottom
- Sides of the opening
Older brick homes often perform better with softer mortar mixes that allow natural movement in the brickwork.
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Step 6: Install the New Brick Vent
Press the vent firmly into place.
Use a spirit level to ensure:
- It sits straight
- It is flush with the wall
- Airflow openings remain clear
Remove excess mortar immediately.
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Step 7: Finish the Joints
Tool the mortar joints neatly to match the existing brickwork.
Clean off excess mortar with a damp sponge before it hardens.
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Mortar Smoothing & Pointing Tools
Step 8: Allow the Mortar to Cure
Leave the area undisturbed while curing.
Typical curing times:
- Initial set: 24 hours
- Full cure: Several days
Avoid excessive moisture during curing.
Proper ventilation beneath homes is important to reduce damp and moisture problems over time.
Common DIY Mistakes to Avoid
- Using mortar that is too wet
- Damaging surrounding bricks during removal
- Blocking vent airflow with excess mortar
- Using mortar stronger than the surrounding brickwork
- Skipping safety equipment
