Karndean LooseLay flooring offers a flexible installation option characterized by its floating floor capability and potential for adhesive application. This article details the installation procedures, subfloor preparation requirements, and adhesive considerations based on available documentation. The system is designed for both residential and commercial applications, with varying adhesive requirements depending on anticipated foot traffic and environmental conditions.
Subfloor Preparation
Proper subfloor preparation is critical for a successful Karndean LooseLay installation. The documentation emphasizes the importance of a clean, smooth, and dry subfloor. Existing cushioned vinyl or non-approved underlayments must be removed before proceeding. Specific moisture content thresholds must be met, varying based on the adhesive system used.
For concrete subfloors, the documentation specifies acceptable Relative Humidity (RH) levels dependent on the adhesive:
- Karndean K-99 HM: 11lbs. (Calcium Chloride) 99% (RH)
- Karndean DrySet: 8lbs. (Calcium Chloride) 95% (RH)
- Karndean K-Spray: 10lbs. (Calcium Chloride) 98% (RH)
- Karndean 2-part Epoxy: 8lb. (Calcium Chloride) 90% (RH)
If moisture readings exceed these values, a damp proof membrane (DPM) or moisture suppression system is required. The documentation notes that some national standards may also require control of the concrete slab’s pH level.
Wood subfloors require a moisture content not exceeding 13%. The documentation does not specify a method for measuring wood subfloor moisture content.
Installation Methods
Karndean LooseLay flooring can be installed using several methods, selected based on the interior environment. These methods include grid stick, full coverage adhesive application, and a floating installation without adhesive in certain circumstances.
Grid Stick Method
The grid stick method utilizes Karndean DrySet, K99-HM, or K-Spray adhesive. It involves applying 4-inch strips of adhesive to all perimeter walls, door thresholds, and at 13-foot intervals parallel to the perimeter, creating a grid pattern. This method is suitable for light foot traffic, non-commercial spaces, and stable in-room climates. The adhesive must be allowed to fully tack off before installation. Tiles or planks must be fitted tightly to the wall and to each other across the entire room. This method is not recommended for 1m x 1m tiles.
Full Coverage Adhesive Application
Full coverage application involves applying adhesive to the entire floor area using an appropriate method and spread rate (e.g., notched trowel, roller). This method is recommended for general foot traffic and light commercial environments with stable in-room climates. As with the grid stick method, the adhesive must fully tack off before installation, and tiles/planks must be fitted tightly together and to the walls. Karndean DrySet, K99-HM, or K-Spray adhesives can be used.
Full Coverage with 2-Part Epoxy
For high-spillage wet areas, sunrooms, conservatories, or areas with panoramic windows, full coverage using Karndean 2-part Epoxy is recommended. This provides the highest level of moisture resistance.
Floating Installation (No Adhesive)
The documentation indicates that LooseLay can be installed without adhesive in many cases, leveraging a special backing designed to grip the subfloor. However, adhesive may be necessary in high-traffic areas or for larger installations to ensure a secure fit.
Plank/Tile Arrangement
The design of Karndean LooseLay products features randomly distributed patterns. To avoid noticeable areas of heavy or light color shading, the documentation recommends unboxing and shuffling the tiles or planks before installation. This ensures a more balanced and natural appearance.
Installation Procedure – General Steps
The general installation procedure, as outlined in the documentation, involves the following steps:
- Prepare the Subfloor: Ensure the subfloor is clean, smooth, and dry, meeting the specified moisture content requirements.
- Acclimate the Planks: Allow the flooring to adjust to room temperature for at least 24 hours before installation.
- Mark the Layout: Mark the center of the room and plan the layout for a balanced look, working outward from the center.
- Lay the Planks: Place each plank on the subfloor, pressing down firmly to ensure a secure fit. Adhesive is not always required, depending on the chosen installation method and environmental conditions.
- Trim Edges: Use a utility knife to cut planks for edges and corners, ensuring a snug fit.
- Secure with Adhesive (Optional): In areas with heavy traffic or for larger installations, apply adhesive to the perimeter or under individual planks as recommended by Karndean.
- Remove Spacers: Once the floor is complete, remove any spacers used to maintain expansion gaps.
- Install Baseboards/Trim: Add baseboards or trim to cover the expansion gap.
Underlayment Considerations
Generally, underlayment is not required for Karndean LooseLay flooring. However, the documentation notes that Karndean’s Quiet Choice acoustic underlayment can be used for additional acoustic performance if desired. LooseLay must not be installed over cushioned vinyl or non-approved underlayments.
Adhesive Selection
The choice of adhesive is crucial and depends on the specific application and environmental conditions. The documentation details several approved adhesives:
- Karndean K-99 HM: Suitable for applications with up to 99% RH.
- Karndean DrySet: Suitable for applications with up to 95% RH when used without adhesive. Requires two coats for optimal performance.
- Karndean K-Spray: Suitable for applications with up to 98% RH.
- Karndean 2-part Epoxy: Recommended for high-spillage wet areas and environments with significant moisture exposure, suitable for up to 90% RH.
Frequently Asked Questions (FAQs)
The documentation addresses several frequently asked questions:
- Subfloor Preparation: Ensure the subfloor is clean, dry, and level. Use a leveling compound to correct imperfections and vacuum thoroughly.
- Installation Over Existing Floors: Karndean flooring can be installed over many existing floors, including concrete, tile, and vinyl, provided the surface is smooth and even.
- Professional Installation: While Click Lock and LooseLay methods are suitable for DIY installation, Glue Down installations are best left to professionals for optimal results.
- Required Tools: Tools vary by installation method but generally include a utility knife, measuring tape, roller, and trowel (for Glue Down).
Conclusion
Karndean LooseLay flooring provides a versatile flooring solution with multiple installation options. Successful installation relies heavily on proper subfloor preparation, appropriate adhesive selection based on environmental conditions, and adherence to the manufacturer’s guidelines. While the LooseLay format often allows for a floating installation, adhesive application may be necessary for enhanced stability and performance in specific applications. Careful consideration of these factors will ensure a durable and aesthetically pleasing result.