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Case Study · Residential Basement & Bedroom

Utility Room, Basement & HVAC Mold Remediation in Gaithersburg, MD

Mold on the painted block walls of a basement utility room around the electrical panel, growth on the lower drywall of a basement wall, settled particulates in a second-floor bedroom carpet pad, and two HVAC systems serving the whole house. Here is how Mold Pro Solutions handled it in Gaithersburg: three separate containments, masonry and framing cleaning, a two-foot flood cut above the damage, carpet pad replacement and remediation of both HVAC systems.

Gaithersburg, MD (Montgomery County) ANSI/IICRC S520 Compliant Single-Family Home Three Containments + 2 HVAC Systems
3 Zones
Utility room, basement wall, bedroom — each contained
2 Systems
HVAC units cleaned, drain pans and condensate lines flushed
4 Days
On site, with 3 HEPA scrubbers + 2 LGR dehumidifiers
Before Remediation
Black mold on lower basement drywall and wet insulation before remediation - Gaithersburg MD
Conditions at Discovery
  • Growth on the block utility-room walls around the electrical panel
  • Mold on the lower drywall of a basement wall and wet insulation
  • Settled particulates in a second-floor bedroom carpet pad
  • Two HVAC systems circulating air through the affected areas
After Remediation
Basement wall with lower drywall removed and clean exposed framing after remediation - Gaithersburg MD
Results Achieved
  • Block walls wire-brushed, cleaned and treated inside containment
  • Drywall cut two feet above the highest damage, framing cleaned
  • Carpet pad replaced and bedroom contents cleaned
  • Both HVAC systems remediated, drain pans and condensate lines flushed

The Scenario

A homeowner in Gaithersburg, MD called Mold Pro Solutions about dark growth on the painted concrete-block walls of the basement utility room, concentrated in the corner around the electrical panel and along the lower courses, and a stretch of basement wall where the drywall had gone black near the floor. Our Montgomery County basement mold guide describes the same pattern: chronic moisture at the base of a below-grade wall.

The inspection confirmed visible fungal growth on the block walls consistent with chronic moisture exposure, suspected growth on the lower drywall and wall assembly, and a second-floor bedroom where settled particulates had reached the carpet pad. The home's two HVAC systems served every one of those spaces, so they were written into the scope from the start. No single water source was identified — the block-wall moisture was chronic — which is why the plan included moisture verification before closing anything up and recommendations for the homeowner to correct the source before reconstruction.

Contributing Factors

Chronic moisture on below-grade block walls — growth concentrated low and in the corners of the utility room
Lower drywall and insulation in contact with a damp wall assembly
Settled particulates upstairs — a bedroom carpet pad affected by what the air carried
Two HVAC systems drawing air from the affected zones, with condensate drainage to check

Initial Findings

Visible
Fungal growth on painted block
walls around the electrical panel
2-ft Cut
Drywall removed to two feet
above the highest damage
2 Systems
HVAC units, drain pans and
condensate lines in the scope
Dark mold growth in the corner of a painted concrete block utility room wall
Utility room — growth in the corner of the painted block wall, low and around the panel
Bedroom carpet pulled back to expose the affected carpet pad
Bedroom carpet — pulled back to expose the affected pad before replacement
HVAC air handler opened for coil and cabinet remediation
HVAC unit — air handler opened for coil and cabinet cleaning
Mold growth along the base of a basement wall behind the baseboard
Basement wall base — growth behind the baseboard at the floor line

Scope of Work Performed

All work followed the ANSI/IICRC S520 Standard for Professional Mold Remediation, the same protocol behind every mold remediation service we perform, with a work log, photos and moisture readings kept throughout.

1
Assessment
Photos, Moisture Readings & Work Log
Every affected area photographed, moisture-meter readings taken on the walls and framing, a work log opened and unaffected finishes protected before any material was disturbed.
2
Engineering Controls
Three Separate Containments
Full critical containments of 6-mil fire-retardant poly with zip poles, zipper doors, floor protection and signage at the utility room, the basement drywall area and the bedroom; HVAC registers sealed; negative pressure maintained for the whole project.
3
Air Quality
HEPA Scrubbers & LGR Dehumidifiers
Three HEPA air scrubbers and two commercial LGR dehumidifiers ran across the containments until the drying goals were met — three days of equipment time.
4
Treatment
Utility Room Block-Wall Remediation
Block walls HEPA-vacuumed, wire-brushed and mechanically cleaned; penetrations, plumbing, sill plates, exposed framing and the concrete floor perimeter detail-cleaned around the energized panel without disturbing it; EPA-registered antimicrobial applied, then an encapsulant on the cleaned masonry for a cleanable finished surface.
5
Removal
Basement Drywall — Two-Foot Flood Cut
Affected drywall and insulation removed to a minimum of two feet above the highest visible damage, bagged inside containment; the exposed framing HEPA-vacuumed, cleaned and treated, with moisture verified before anything could be closed.
6
Contents
Bedroom Carpet Pad & Contents Cleaning
Carpet lifted, the affected pad removed and replaced, the carpet and the room's contents HEPA-vacuumed and cleaned under containment.
7
HVAC
Two HVAC Systems Remediated
Both systems cleaned and treated, including the drain pans and condensate drains, which were cleaned and flushed so the equipment would not keep feeding moisture and spores back into the house.
8
Completion
Final HEPA Cleaning & Moisture Verification
Detailed HEPA vacuuming and damp-wiping of every containment, moisture readings checked against the drying goals, and the areas left clean and open for the separately quoted reconstruction.
Poly containment with red zipper door sealing the basement work area
Step 2 — Containment — 6-mil poly with a zipper door sealing the basement work zone
Technician HEPA-vacuuming a bedroom carpet during remediation
Step 6 — Bedroom — HEPA vacuuming the carpet and contents inside the third containment

Results

Before Remediation
Fungal growth on the utility-room block walls
Black lower drywall and wet insulation on a basement wall
Affected carpet pad in an upstairs bedroom
Two HVAC systems serving the affected spaces
After Remediation
Block walls cleaned, treated and encapsulated inside containment
Drywall cut two feet above the damage, framing cleaned and verified dry
Carpet pad replaced, carpet and contents cleaned
Both HVAC systems remediated with condensate drainage flushed
"Our mission is simple: remove the mold, solve the moisture problem, and give homeowners peace of mind."
— Mold Pro Solutions | Safer Home. Healthier Family. Lasting Results.

Key Takeaways

Block walls are cleaned, not painted
Masonry gets HEPA vacuuming and wire brushing down to clean block, then treatment and an encapsulant on the clean surface. Paint over growth is the problem the next owner finds.
Two feet above the damage
A flood cut two feet above the highest visible damage reaches drywall and insulation that look fine but are not; the cut height is confirmed with the moisture meter, not guessed.
One house, three containments
The utility room, the basement wall and the bedroom were sealed separately, so work in one zone never contaminated another and the rest of the house stayed in use.
Upstairs can be affected by what happens downstairs
Settled particulates reached a bedroom carpet pad two floors up — the reason the scope followed the air, not just the visible growth.
HVAC remediation includes the condensate side
Drain pans and condensate lines were cleaned and flushed; a dirty pan keeps an air handler wet. See our air quality testing page for how a system shows up in the air.
Chronic moisture needs a source fix
No single water source was identified on the block walls, so the homeowner was advised to correct exterior drainage and any water entry before reconstruction. Remediation is not waterproofing.

Curious what a project like this costs? See our mold remediation cost guide for Montgomery County for typical price ranges by project size.

Project Overview
LocationGaithersburg, MD
CountyMontgomery County
Property TypeSingle-Family Home
Affected SpaceUtility room, basement wall, 2nd-floor bedroom, two HVAC systems
Removal RuleDrywall cut 2 ft above the highest damage
StandardANSI/IICRC S520
CategoryMold Remediation + HVAC + Contents
Clearance TestNot in this scope — independent verification available on request
Project by the Numbers
Containments3
HEPA air scrubbers3
LGR dehumidifiers2
HVAC systems remediated2
Equipment time3 days
Days on site4
What Was Verified
  • IICRC S520 followed throughout
  • Three 6-mil containments, negative pressure, sealed registers
  • Block walls wire-brushed, treated and encapsulated
  • Two-foot flood cut on the affected drywall
  • Framing cleaned and moisture-verified
  • Bedroom carpet pad replaced, contents cleaned
  • Both HVAC systems remediated
  • Final HEPA detail cleaning

ANSI/IICRC S520 Certified

Every Mold Pro Solutions remediation follows the industry standard — and includes a 2-Year Mold-Free Warranty.

See Our Full Process →
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Frequently Asked Questions

By physical removal: HEPA vacuuming, wire brushing and mechanical cleaning of the block and the mortar joints, detail cleaning around penetrations and the floor perimeter, then an EPA-registered antimicrobial and, once dry, an encapsulant that leaves a cleanable surface. Painting over the growth is not remediation.

Moisture and growth travel up inside drywall paper and insulation beyond what shows on the surface. Removing to a minimum of two feet above the highest visible damage, confirmed with moisture readings, reaches clean, dry material.

Settled fungal particulates had reached the carpet pad in a second-floor bedroom. The scope follows where the air went, not only where the growth was visible, so the pad was replaced and the room cleaned under its own containment.

Yes. The panel area is cleaned without disturbing energized components: HEPA vacuuming and hand cleaning of the surrounding block, penetrations and framing, with the panel itself protected and left to a licensed electrician if anything inside needs attention.

The chronic moisture on the block walls has no single identified source, so exterior drainage and any water entry need correction, and the HVAC condensate drainage has to stay clear. Reconstruction waits until the framing reads dry and the source is addressed.

Customer Reviews

What Montgomery County Homeowners Say

Trinh Le

King farm, Rockville MD

★★★★★

Outstanding service from Mold Pro Solutions! They handled a complex mold remediation job quickly and professionally. Sean, in particular, was incredibly knowledgeable, pe... Read more

Mold Remediationvia Google

Zora Martin

Crown, Gaithersburg

★★★★★

I used this company for the first time after noticing good reviews. The customer service was excellent, and could not have had better results for the mold remediation pro... Read more

Mold Inspectionvia Google

Doug Terle

Aspen Hill, Rockville MD

★★★★★

Sean and his team were prompt and thorough with remediation and a number of repairs. Price assessment: Reasonable price Read more

Mold Remediationvia Google

Zoe V

Manor Woods, Rockville MD

★★★★★

This company is very flexible and very caring and great to work with. They did mold remediation for us and successfully cleaned the whole house, ensuring no more mold iss... Read more

Mold Remediationvia Google

Jason Cohen

Great Seneca, Germantown MD

★★★★★

Responsive, scheduled relatively quickly, actually showed up at the scheduled time, the techs were very respectful of my home and did a great job cleaning up after themse... Read more

Mold Remediationvia Google

Jason C.

Neelsville, Germantown MD

★★★★★

Responsive, scheduled relatively quickly, actually showed up at the scheduled time, the techs were very respectful of my home and did a great job cleaning up after themse... Read more

Mold Remediationvia Yelp

Kitty BenSimon

Crown, Gaithersburg

★★★★★

I cannot recommend Mold Pro Solutions enough. Discovering mold in our home was stressful, but their team handled everything with white-glove professionalism. They didn't... Read more

Flood restoration, Remodelling, Mold inspectionvia Google

Zeus Dolor

Dumont Oaks, Silver Spring

★★★★★

Mold Pro Solutions did an excellent job from start to finish. They were professional, responsive, and took the time to explain what was causing the mold problem and what... Read more

Mold Remediationvia Google

Rachel Michele

Glen Mar Park, Bethesda

★★★★★

Very highly recommend Sean

Mold Remediationvia Google

Sandrine Church

Orchard Knolls, North Potomac

★★★★★

Exceptional experience that is hard to find. Sean is incredibly knowledgeable professional, personable, and concerned about safety above all. Proposals are super reasonab... Read more

Mold Remediationvia Google

Cameron Goudarznia

Congressional Country Club Falconhurst, Potomac

★★★★★

We recently hired Mold Pro Solutions to remediate mold in our bathroom and attic, and the experience was excellent from start to finish. The team was professional, knowle... Read more

Mold Remediationvia Google

Dunia Rodriguez

Saddle Ridge, Potomac

★★★★★

I had Mold Pro Solutions remediate mold in my basement after discovering moisture damage behind the walls. From the initial inspection to the final cleanup, the entire pr... Read more

Mold Remediationvia Google

Tatiana Bermudez

Kenwood, Bethesda

★★★★★

Mold Pro Solutions did an outstanding job remediating mold in my basement. They showed up on time, tested everything, and explained the whole process step by step. The wo... Read more

Mold Remediationvia Google

Mariangela Prete

Glen Hills, Potomac

★★★★★

Mold Pro Solutions did a fantastic job on our shower mold remediation and reconstruction. They thoroughly removed all the mold, treated the area properly, and rebuilt the... Read more

Mold Remediationvia Google

Olga Wakid

Edgemoore, Bethesda

★★★★★

Outstanding service from Mold Pro Solutions! They handled a complex mold remediation job in our attic and HVAC system quickly and professionally. The team was punctual, t... Read more

Mold Remediationvia Google

Micheal B.

River Falls, Potomac Md

★★★★★

I highly recommend Mold Pro Solutions! We recently discovered mold in our attic and were incredibly stressed about it. From the initial inspection to the final walkthroug... Read more

Mold Remediationvia Google

Ned Suleiman

neelsville, Germantown MD

★★★★★

We recently had to deal with a stressful situation in our kitchen that required both mold remediation and a complete rebuild. I cannot recommend mold Pro solutions enough... Read more

Mold Remediationvia Google

Brian Pickering

Woodcliffe Park, Boyds MD

★★★★★

I had mold remediation completed in my utility room and HVAC unit by Mold Pro Solutions, and the entire experience was smooth and stress-free. The team was professional,... Read more

Mold Inspection & Remediationvia Google

Scott Gershman

Crown, Gaithersburg MD

★★★★★

Outstanding Service – Incredibly Professional and Neat! I cannot recommend Mold Pro Solutions highly enough. Discovering mold is always stressful, but their team made the... Read more

Mold Inspection & Remediationvia Google

Jsalaum

Clarksburg village, Clarksburg MD

★★★★★

Incredible team! Their professionalism was on full display from start to finish—they were punctual, respectful, and clearly knew their stuff. I suspected a minor issue, b... Read more

Mold Inspection & Remediationvia Google

Johan

King Farm, Rockville MD

★★★★★

I can’t thank Mold Pro Solutions enough! They recently remediated and completely rebuilt my master bedroom shower after a mold issue. They worked so efficiently and did s... Read more

Mold Remediationvia Google

Trinh Le

King farm, Rockville MD

★★★★★

Outstanding service from Mold Pro Solutions! They handled a complex mold remediation job quickly and professionally. Sean, in particular, was incredibly knowledgeable, pe... Read more

Mold Remediationvia Google

Zora Martin

Crown, Gaithersburg

★★★★★

I used this company for the first time after noticing good reviews. The customer service was excellent, and could not have had better results for the mold remediation pro... Read more

Mold Inspectionvia Google

Doug Terle

Aspen Hill, Rockville MD

★★★★★

Sean and his team were prompt and thorough with remediation and a number of repairs. Price assessment: Reasonable price Read more

Mold Remediationvia Google

Zoe V

Manor Woods, Rockville MD

★★★★★

This company is very flexible and very caring and great to work with. They did mold remediation for us and successfully cleaned the whole house, ensuring no more mold iss... Read more

Mold Remediationvia Google

Jason Cohen

Great Seneca, Germantown MD

★★★★★

Responsive, scheduled relatively quickly, actually showed up at the scheduled time, the techs were very respectful of my home and did a great job cleaning up after themse... Read more

Mold Remediationvia Google

Jason C.

Neelsville, Germantown MD

★★★★★

Responsive, scheduled relatively quickly, actually showed up at the scheduled time, the techs were very respectful of my home and did a great job cleaning up after themse... Read more

Mold Remediationvia Yelp

Kitty BenSimon

Crown, Gaithersburg

★★★★★

I cannot recommend Mold Pro Solutions enough. Discovering mold in our home was stressful, but their team handled everything with white-glove professionalism. They didn't... Read more

Flood restoration, Remodelling, Mold inspectionvia Google

Zeus Dolor

Dumont Oaks, Silver Spring

★★★★★

Mold Pro Solutions did an excellent job from start to finish. They were professional, responsive, and took the time to explain what was causing the mold problem and what... Read more

Mold Remediationvia Google

Rachel Michele

Glen Mar Park, Bethesda

★★★★★

Very highly recommend Sean

Mold Remediationvia Google

Sandrine Church

Orchard Knolls, North Potomac

★★★★★

Exceptional experience that is hard to find. Sean is incredibly knowledgeable professional, personable, and concerned about safety above all. Proposals are super reasonab... Read more

Mold Remediationvia Google

Cameron Goudarznia

Congressional Country Club Falconhurst, Potomac

★★★★★

We recently hired Mold Pro Solutions to remediate mold in our bathroom and attic, and the experience was excellent from start to finish. The team was professional, knowle... Read more

Mold Remediationvia Google

Dunia Rodriguez

Saddle Ridge, Potomac

★★★★★

I had Mold Pro Solutions remediate mold in my basement after discovering moisture damage behind the walls. From the initial inspection to the final cleanup, the entire pr... Read more

Mold Remediationvia Google

Tatiana Bermudez

Kenwood, Bethesda

★★★★★

Mold Pro Solutions did an outstanding job remediating mold in my basement. They showed up on time, tested everything, and explained the whole process step by step. The wo... Read more

Mold Remediationvia Google

Mariangela Prete

Glen Hills, Potomac

★★★★★

Mold Pro Solutions did a fantastic job on our shower mold remediation and reconstruction. They thoroughly removed all the mold, treated the area properly, and rebuilt the... Read more

Mold Remediationvia Google

Olga Wakid

Edgemoore, Bethesda

★★★★★

Outstanding service from Mold Pro Solutions! They handled a complex mold remediation job in our attic and HVAC system quickly and professionally. The team was punctual, t... Read more

Mold Remediationvia Google

Micheal B.

River Falls, Potomac Md

★★★★★

I highly recommend Mold Pro Solutions! We recently discovered mold in our attic and were incredibly stressed about it. From the initial inspection to the final walkthroug... Read more

Mold Remediationvia Google

Ned Suleiman

neelsville, Germantown MD

★★★★★

We recently had to deal with a stressful situation in our kitchen that required both mold remediation and a complete rebuild. I cannot recommend mold Pro solutions enough... Read more

Mold Remediationvia Google

Brian Pickering

Woodcliffe Park, Boyds MD

★★★★★

I had mold remediation completed in my utility room and HVAC unit by Mold Pro Solutions, and the entire experience was smooth and stress-free. The team was professional,... Read more

Mold Inspection & Remediationvia Google

Scott Gershman

Crown, Gaithersburg MD

★★★★★

Outstanding Service – Incredibly Professional and Neat! I cannot recommend Mold Pro Solutions highly enough. Discovering mold is always stressful, but their team made the... Read more

Mold Inspection & Remediationvia Google

Jsalaum

Clarksburg village, Clarksburg MD

★★★★★

Incredible team! Their professionalism was on full display from start to finish—they were punctual, respectful, and clearly knew their stuff. I suspected a minor issue, b... Read more

Mold Inspection & Remediationvia Google

Johan

King Farm, Rockville MD

★★★★★

I can’t thank Mold Pro Solutions enough! They recently remediated and completely rebuilt my master bedroom shower after a mold issue. They worked so efficiently and did s... Read more

Mold Remediationvia Google
2-Year Mold-Free Warranty Included

Mold on a block wall or around the electrical panel in Gaithersburg?

Utility rooms, basement walls, carpets upstairs and the HVAC systems that connect them — our IICRC-certified team remediates the whole chain across Montgomery County. Written estimate, no obligation.

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