A* RESULT
Fast-track products from F. Ball and Co. Ltd. have enabled a school hall in Staffordshire to be refurbished during the exam season without disruption to students.
Contractors from Basford-based B&P Flooring were called to refurbish the floor of a school hall at Alleyne’s Academy, in Stone, after it was damaged by floods. The team installed new wood floorcoverings over an area of 195m2
after carefully
preparing the subfloor to optimise the appearance and performance of the newly-installed flooring.
To begin with, contractors removed existing wooden blocks from the floor and used a mechanical scabbler to remove old adhesive residues left behind.
Lifting the wooden blocks resulted in minor damage to the building’s existing concrete screed, causing holes up to 25mm deep to appear. These were repaired using F. Ball’s Stopgap 1200 Pro levelling compound mixed with Stopgap graded aggregate.
Stopgap 1200 Pro is a fast setting, fast drying two-component levelling compound, which can be used directly over old adhesive residues, in which case there is no need to prime beforehand. It can also be filled up to 30mm to repair damaged subfloors when mixed with aggregate. The levelling compound is moisture resistant, allowing it to be applied before a waterproof surface membrane where a moisture management solution is required to stop the adverse effects of excess subfloor moisture on subsequently installed floorcoverings.
Once the repairs to the subfloor were complete, contractors applied F. Ball’s Stopgap P131 general-purpose primer, diluted with seven parts of water to every one part of primer, over the subfloor. When applied over absorbent surfaces, such as concrete or sand/cement screeds, Stopgap P131 serves to promote the application characteristics and stop the unacceptably rapid drying of subsequently applied levelling compounds. Priming also prevents pinholing – tiny bubbles formed by the slow escape of air from the subfloor, which burst on reaching the surface of the levelling compound as it cures and can affect the appearance of a finished installation.
30 | EDUCATION
Once the primer was dry, Stopgap 1200 Pro levelling compound was applied at a thickness of approximately 5mm over the primed subfloor.
Before the project began, it was determined that moisture levels in the subfloor exceeded the maximum threshold for installing wood floorcoverings, which are particularly susceptible to damage from moisture. Where subfloor relative humidity levels exceed 65% relative humidity (RH) and wood floorcoverings are to be installed, a moisture management solution is essential to stop excess subfloor moisture attacking adhesives and damaging floorcoverings, potentially resulting in complete floor failure.
For this reason, contractors applied F. Ball’s Stopgap F77 one-part waterproof surface membrane to create a barrier to impede the passage of excess subfloor moisture to the level of the floorcoverings. Stopgap F77 allows a barrier against moisture values of up to 98% RH to be created with a single coat application in as little as three hours.
After the waterproof surface membrane had cured, another layer of Stopgap 1200 Pro was applied to create a perfectly smooth base for the receipt of new wooden floorcoverings. If applied to Stopgap waterproof surface
membranes within 24 hours of the membrane curing, there is no need to prime the surface beforehand. Contractors went over the levelling compound with an F. Ball spiked roller to dispel any trapped air to avoid pinholing occurring.
When the levelling compound had cured, contractors used F. Ball’s Styccobond B95 high performance wood flooring adhesive to install new oak blocks over the entire floor area in a herringbone pattern. Styccobond B95 is a one- part, flexible, moisture-curing adhesive for installing a wide range of wood floorcoverings. For this purpose it is designed to accommodate the natural movement of wood over the lifetime of the floorcoverings. It is solvent and isocyanate-free, quick to develop a high bond strength and provides good grab − an advantage for contractors creating the parquet design.
Commenting on the project, managing director of B&P Flooring Mark Stevenson said: “Using Stopgap 1200 Pro allowed us to complete the project to a high standard, quickly, meaning no work was ongoing while the students were taking their exams.”
www.f-ball.co.uk
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