To effectively seal an interior brick chimney, the process involves proper surface preparation followed by the application of a suitable sealant.
Here's a breakdown of the steps involved in sealing your interior brick chimney, based on common practices and the provided information:
Sealing Your Interior Brick Chimney: A Step-by-Step Process
Proper preparation is key to ensuring the sealant adheres correctly and provides lasting protection against moisture and efflorescence.
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Check for Any Cracks to Fill With Masonry Crack Filler.
- Inspect the brick and mortar joints for any cracks or gaps. These need to be repaired before sealing to prevent moisture penetration through the structure.
- Use a suitable masonry crack filler to fill all detected imperfections. Ensure the filler is pressed firmly into the cracks and smoothed flush with the surface. (Source.)
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If Present, Remove Efflorescence.
- Efflorescence is a white, powdery substance that can appear on brick surfaces due to moisture pulling salts from the masonry to the surface as it evaporates.
- If efflorescence is present, it must be completely removed. This usually involves brushing and potentially using a masonry cleaner designed for efflorescence removal, following the product instructions carefully. (Source.)
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Clean Off Any Remaining Debris.
- After addressing cracks and efflorescence, thoroughly clean the entire chimney surface.
- Remove any loose debris, dirt, dust, or old paint using a brush, wire brush, or vacuum. A clean surface ensures the sealant can penetrate and bond properly.
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Allow Brick to Dry Before Sealing.
- Moisture is the enemy of effective sealing. After cleaning or any repairs involving water, the brick surface must be completely dry.
- Allow sufficient time for the brick to dry thoroughly according to ambient conditions. Sealing over damp brick can trap moisture and lead to future problems.
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Apply DRYLOK Siloxane 7 Penetrating Sealer.
- Once the surface is prepared and dry, apply the sealant.
- DRYLOK Siloxane 7 Penetrating Sealer is specified for this task. Penetrating sealers soak into the pores of the brick and mortar, providing water repellency without forming a film on the surface that can alter the appearance or peel.
- Apply the sealer according to the manufacturer's instructions, which typically involves using a brush, roller, or sprayer. Ensure even coverage across the entire surface you wish to seal.
Following these steps ensures the brick chimney is properly prepared and sealed, helping to protect it from moisture damage and staining.
