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Concrete Floor Alkalinity Ph Testing

How We Fixed it: Drying a Water Damaged Sub Floor

Water Extraction with a powerful truck-mounted extraction machine
Drying by tenting wet carpet

Installation of drymatic in the upstairs area to create an ideal environment for drying

Installation of Spitfire in subfloor space to bring temperatures up to 45-60 degrees for ideal drying temperatures for yellow tongue flooring.

Installation of Direct-it-in kits to dry walls in upstairs and downstairs areas

Use of Direct-it-in to dry kitchen cabinetry

Installation of Dri-Eaz LGR 7000 and R200 dehumidifiers to draw moisture from the air
Installation of 2 x Injectidry with plates units to draw moisture from chipboard through grout lines in tiles.

Installation of 3 x HEPA filter 500s to draw heated air through upper subfloor air space and expel to outside

Final Outcome

  • Reduction to acceptable moisture levels in building components recorded in subfloor open void area
  • Reduction of moisture levels to acceptable moisture levels in building components in upper enclosed truss area between floor levels
  • Reduction to walls and wall base plates to acceptable levels reduction in moisture in chipboard sub-flooring between levels with significant results carpets recovered in 4 bedrooms
  • Kitchen cabinetry saved

Future suggestions

Would have used desiccant dehumidification in place of LGRs as they work in a higher temperature range.

The client is very happy with the results due to the fast turnaround enabling tenants to be put in property faster, therefore, saving money. This was an insurance quoted job.

Our client was having difficulties with carpet tiles adhering to​ the concrete floor. We were asked to conduct to see if the carpet tiles were not sticking due to the high alkalinity (ph levels) of the concrete.

Project Highlights

6

Test Points

Successful Diagnosis of Problem

Methodology

For each test point, a small sample of concrete dust was obtained. The sample was then treated with a pH dye indicator solution and then a small amount of barium sulphate was added as an activator. pH values were then read by comparing the colour of the sample to a standard

Results

For installation of flooring on concrete the guidelines (ASTM F710) state that the pH of the concrete should be between 7 and 9. The pH values from all sample locations were very alkaline (all greater than pH 11). We found that the alkalinity of the slab is therefore a likely cause of the failure of carpet adhesive. It is recommended that flooring installers be consulted for advice on how to address the issue

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