Why the brick wall is usually the last thing to stop smelling
Most converted warehouses in River North were built with soft, low-fired common brick laid in lime-rich mortar. When a building becomes lofts, that masonry is often sandblasted or wire-brushed to show off the texture, which strips the hard outer face and leaves an open, porous surface. Smoke particles and the sticky compounds in cannabis and tobacco smoke land on that surface and wick inward, especially in the mortar joints, which are softer than the brick itself.
Painted drywall can be washed and primed. A brick wall that has been smoked against for a few years is a different job: the residue is spread through a rough, deep surface with thousands of small cavities, and every warm afternoon or blast of forced air releases a little more of it. That is why people often clean everything else in a loft, notice a big improvement, and then find the brick wall still gives off a stale or skunky note when the sun hits it.
Brick at a glance
- Most absorbent part
- Mortar joints, then sandblasted brick faces
- Typical warning sign
- Odor strongest when the wall is warm from sun or heat
- Hardest to clean
- Deep raked joints and high sections near the ceiling
- Biggest risk in cleaning
- Over-wetting soft brick or using harsh acid that erodes mortar
- Sealing
- An option after cleaning, never a substitute for it
How a brick wall is usually worked on
The order matters more than any single product. Ask any provider to describe each stage for your wall.
- Test a small patch.A low, out-of-the-way area is cleaned first to see how the brick and mortar react, whether the color shifts, and how much residue comes off on a white cloth.
- Dry soil removal.Loose dust and soot are vacuumed with a soft brush attachment before anything wet touches the wall, so the grime is not driven deeper into the pores.
- Controlled wet cleaning.A masonry-appropriate cleaner is applied with low moisture and agitated with brushes, working in sections from the top down. Dripping is caught before it runs across clean brick or onto floors.
- Rinse and dry fully.Residue loosened by the cleaner has to be lifted away, not left to dry back in. The wall then needs time to dry, which in Denver's dry air is often faster than people expect, but a thick wall still takes days.
- Re-smell before deciding on sealing.After drying, the wall is checked warm and cool. Only if odor persists in specific areas is a sealer or encapsulating coating considered for those sections.
Finishing options after cleaning
| Option | Effect on look | Effect on odor | Things to ask |
|---|---|---|---|
| Leave unsealed | Keeps the raw, matte texture | Fine if cleaning removed the residue; any leftover keeps releasing | Can the wall be re-smelled after a warm week before deciding? |
| Breathable penetrating sealer | Little visible change, sometimes slightly darker | Slows release of remaining residue and makes future cleaning easier | Is it vapor-permeable so moisture can still leave the brick? |
| Clear film-forming coating | Can add sheen and look plasticky | Locks residue in but can trap moisture | What happens if water gets behind it? |
| Odor-sealing primer and paint | Covers the brick entirely | Most reliable on stubborn sections | Is the owner or HOA allowed to paint exposed brick in this building? |
Common questions
Can I just scrub the brick myself with a degreaser?
Light, occasional smoking can sometimes be handled that way if you work in small sections, keep it low-moisture and rinse well. Years of indoor smoking usually means residue deep in the joints that household scrubbing will not reach.
Will sealing brick change how my loft looks?
Penetrating sealers usually change little; film-forming coatings can add gloss. Ask for a test patch in a corner and look at it in daylight before the whole wall is done.
General information for RiNo, not a quote or professional advice. In an emergency, call 911.