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Is Your Subfloor Flatness Ready for Flooring? How to Check for Flatness

Installing new timber flooring can transform your home, enhancing both its beauty and value. However, before diving into picking the perfect flooring, it's crucial to ensure that your subfloor is in great condition. A flat subfloor is vital for a smooth finish and the durability of your flooring. This guide will help you check the flatness of your subfloor. We will cover essential tools, techniques, and detailed steps to help ensure you are well-prepared for your timber flooring installation. This guide is suitable for both a floating floor or direct glue down system from any of Imperial Flooring Australia's Floor covering types.


What is the Australian Subfloor Flatness Standards?


Before installing engineered timber flooring, hybrid flooring, or laminate flooring from Imperial Flooring Australia, it is necessary to achieve a flatness tolerance of 3mm over a 3-meter span.


Why Is Subfloor Flatness Important?


Flatness is essential for successful timber flooring installation. An uneven subfloor can lead to several problems, such as:


  1. Gaps and Lifting: Timber flooring may not lay flat, causing gaps between planks or sections that lift, which can worsen over time.

  2. Stress on Planks: An uneven surface may create stress points that lead to warping or other issues.


  3. Difficulty in Installation: Flooring installation can become complicated and time-consuming on an uneven surface.


By recognising the importance of flatness, you’ve already taken a positive step toward ensuring a successful flooring project.


Tools Required for Measuring Subfloor Flatness


Before you start, gather these tools:


  • Straightedge or Laser Level: A 2-3 metre straightedge or rotary floor laser will help identify high and low spots on your subfloor.

  • Measuring Tape: This is necessary for measuring distances where you note any unevenness.


  • Chalk Line: Use this to create reference lines, making it easier to see where adjustments are necessary.


  • Shims or Flooring Filler: If you find irregularities, shims or a leveling compound will help you make the required adjustments.


Having these tools ready will prepare you for an accurate assessment of your subfloor.


The Measurement Process


Step 1: Clear the Area


First, remove furniture, rugs, or debris from the flooring area to ensure a clear view of the subfloor.


Step 2: Use the Straightedge or Level


Place your straightedge or level flat on the subfloor in various directions—vertically and diagonally.


Check for gaps underneath. Measure these gaps with your measuring tape.


Any gap exceeding 3mm over a 3metre span is typically too uneven for timber flooring installation.


Step 3: Mark High and Low Spots


Take notes or mark high and low points on your subfloor using a chalk line. Identifying these areas will guide your next steps effectively.


Step 4: Repeat


Move your straightedge to different areas of the subfloor and repeat the measuring process. Checking multiple locations ensures a more accurate understanding of your subfloor's overall condition.


Evaluating the Results


Understanding the Measurements


Once you have your measurements, compare all your readings. If your measurements exceed acceptable flatness guidelines, adjustments will be necessary.


Address problem areas promptly to create a flat surface for your timber flooring installation.


Locate Problem Areas


Focus on consistent problem areas. Systematically document your findings. Having a clear idea of where adjustments are needed will simplify your repair efforts.


Making Adjustments


Step 1: Fill Low Spots with Floor Self Levelling Compounds


For low spots, apply a flooring self levelling compound suitable to the subfloor type to bring them up to the level of surrounding areas. Look for products specifically designed for flooring, as these often yield the best results.


Follow the manufacturer's instructions for optimal application.




Step 2: Sand or Grind High Spots


When dealing with high spots, sanding is effective for leveling the surface of timber subfloors, while a floor grinder is recommended for concrete subfloors. Be sure to wear a mask and appropriate safety gear when operating power tools.


Step 3: Recheck Flatness


After adjustments, re-measure using your straightedge or level. This crucial step confirms whether your subfloor now meets flatness standards.


For significant height differences, consider further examination or professional help.


Additional Considerations


Moisture Issues


Check for moisture in your subfloor before installing timber flooring. Excess moisture can cause wood to expand or warp. Installing a moisture barrier eliminates any risks.


Professional Assistance


If the assessment and adjustment process feels overwhelming, hiring a professional might be beneficial. They can provide valuable insights and ensure your subfloor meets all necessary requirements for timber flooring installation.


Final Thoughts on Preparation


Getting your subfloor ready for new timber flooring is a critical step in the flooring project that can affect the final results. Checking for flatness is not only about preventing future issues but also for guaranteeing the beauty and longevity of your new floor.


By utilizing the right tools and following the outlined steps, you can effectively assess and prepare your subfloor. Take your time with this process. If you feel uncertain, don’t hesitate to consult with professionals. A level subfloor sets the stage for a stunning timber floor that enhances your home's look and lasts for years to come.


By ensuring your subfloor is flat, you pave the way for a seamless installation of timber flooring that improves your home's appeal and value.


Floor self levelling
Subfloor low spot of 75mm existing slab poured with Cemimax DL55 Floor Leveller

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