What is Stone polymer composite floors?

Understand Stone polymer composite floors

1.0 WHAT IS SPC (Stone polymer composite) floors

SPC, Stone Polymer Composite, is composed of a limestone core, PVC dust, and a stabilizer. Since the composition focuses heavily on the limestone factor, we find that SPC has a rigid, dense core. With that incredibly dense core, SPC(Stone polymer composite) is more impact-resistant than its LVF counterpart, Wood Polymer Composite (WPC). In addition, it is made up of four layers:

  • Top Layer: The upmost layer is composed of a stain-resistant and waterproof UV Ceramic Bead.
  • Second Layer: The second layer is the transparent wear layer that helps provide added protection without affecting the color of your product.
  • Third Layer: The third layer is the high-definition design.
  • Fourth Layer: The fourth layer is the rigid core that helps hinder any expansion and contraction.
understand Stone polymer composite flooring
  1. Edge jointing systems

The edge jointing systems vary and are often patented designs with names including: Uniclic, Dorp-lock,with each having its own individual profile. It is important that the jointing system has sufficient strength and provides sufficient locking force to prevent separation. It should be noted that strength, fit, ease and speed of installation varies substantially between locking systems.

At board ends there are two distinct profile types often used which affect the method of installation. The first is where the profile requires the end of the board being installed to be angled on installation into the end joint of an installed board before marrying the edge joint, known as ‘angle-angle’ installation. With this method tapping blocks are often required to ensure tight board edge joints. The second profile is often referred to as ‘drop lock’ where on installation the long side of the panel is angled into position and as the board is lowered into place the end joints lock. This style relies on the next row of boards completing the locking of the board end joint.

1.02 subfloors

All subfloors should be sound and structurally comply with relevant Australian construction standards (i.e. the supporting timber or concrete which may also have been overlaid with tiles or resilient flooring etc.). Any determined problems with an existing subfloor or overlaid product (for example, squeaks in an existing timber or sheet subfloor or tile fixing integrity) may affect the performance or appearance of the installed laminate floor and should be corrected prior to floor installation.

All subfloors need to be sufficiently flat to accept floating flooring systems, even though tolerances are not always specified in the manufacturer’s instructions and often differ between manufacturers. This is even more critical with floating floors than adhesive fixed floors. If the subfloor is not sufficiently level, then this can lead to board squeaking or separating. A tolerance where deviations do not exceed 2mm beneath a 1m-long straight edge (or 3mm beneath a 1.5m-straight edge) is considered applicable. Some manufacturers specify tighter tolerances and others not as tight. It is important to comply with the specified manufacturer’s tolerances. Where concrete subfloors are not sufficiently flat, leveling compounds and grinding to level the subfloor needs to be undertaken. With timber and timber-based subfloors, packing of joists and sanding of sheet subfloors may be necessary.

1.03 concret slab subfloors

Steps need to be taken to prevent possible moisture uptake into the flooring from the concrete subfloor. Moisture absorption from beneath the floor can cause greater levels of expansion resulting in board distortion and buckling. New slabs need to be given adequately drying time (four to six months) and it should not be assumed that old slabs are ‘dry’ slabs. Some slabs have greater ongoing permeability to moisture vapor than others and slab moisture can vary with water table height and weather conditions. 

Particular care is required with slabs that are below ground level and which can be more prone to pressure effects from ground moisture and also with construction joints between slabs through which there can be a continual transfer of moisture vapor and, at times, moisture by capillary action. Such joints should be sealed as necessary.

Protection from slab moisture is either provided through polyethylene plastic sheeting over the slab or underlay with a similar plastic layer as an integral part of it. When polyethylene sheeting is used it is often 0.2mm (200 microns) thick, taped at overlaps of 200mm and is often brought up to at least floor level at walls and other vertical elements (for example, island benches). Note that some underlays with integral moisture-retarding layer that are significantly less than 0.2mm will not provide the same level of protection, and in some situations an additional polyethylene sheet barrier should be considered.

1.04 Locality and dwelling environment

Conditions of about 18 to 25ºC and 50 to 60% relative humidity are regarded as comfortable conditions. However, when the humidity falls outside the range of 30% (dry conditions) to 70% (moderately humid), then performance effects need further consideration. Low humidity results in greater shrinkage and high humidity in greater expansion. Some problem like squeaks in an existing timber or sheet subfloor or tile fixing integrity)

Prior to laying the floor, a period of 48 hours acclimatization is recommended. When acclimatizing laminate flooring, the boxes remain in their plastic wrap, unopened, for 48 hours so that the flooring can become accustomed to the temperature within the dwelling.


Note that this is not the case with engineered or bamboo floating floors where width movement is greater than length movement.

When considering this further, it also becomes apparent that adjoining floor areas are generally different sizes. That is, a 15m-long by 1m-wide hallway may adjoin through a doorway to a bedroom that is 3m long by 3m wide. As such, the hallway floor under high humidity conditions would expand more in its length than the bedroom floor. Consequently, there will be a difference in the movement of the two floor areas where they adjoin. To prevent one floor area from having an adverse effect on the other, it is necessary to separate the two floor areas. Therefore, control joints need to be added and this is referred to as compartmentalization. An example with applicable trims is shown in the diagram opposite. With these joints, one floor area can no longer impair the movement of the other. The diagram shows a hallway with a control joint to separate the movement of the hallway floor from that leading into the room off it. As such, controls joints may be needed within the main body of a floor as well as with doorways to rooms off hallways.

The next aspect to consider is the overall size of the room or floor area that may extend from one room to another. Manufacturers’ installation instructions require intermediate control joints if the floor area is over a certain size. This may be, say, 10m in length and 8m in the width of the floor, which in some instances may influence decisions regarding the laying direction. It is important, however, that the specific manufacturer’s instructions are followed with regard to this as a different manufacturer may, for example, specify 10m in both floor width and length of the floor.

  1.  Production other

Manufactory accepted product tolerance, upon and down warping, edge damage (not damage surface & Décor ) and some of unqualified product. The tolerance inclusive edge, thickness, width, T&G etc.

Products tolerancewarpingEdge damageUnqualified
<0.15mm<15% of length<0.5% of length<0.3%



Thoroughly examine the flooring prior to installation for grade, color, finish and quality. Ensure adequate lighting for proper inspection.

SPC(Stone polymer composite) products are plastic which has a benefit in them being moisture resistance and therefore not subject to dimension change with humidity, however, they are subject to dimensional change with changing temperature which similarly needs to be attended to at installation.

It was indicated that SPC(Stone polymer composite) products expand and contract depending on the temperature. If the temperature rises then the flooring will expand in both width and length, and the contrary is that a lowering in temperature will cause the flooring to contract. The greater the variation between summer and winter, the greater the seasonal movement that will occur and therefore the need for trims within the floor.

Please understand flooring NOT SUITABLE for all of the / all of these environment :

  1. Strong sun-light room and no cover window . 
  2. New plywood sub-floor . 

Plywood may Let’s SPC flooring cupping or warping if sunlight strong, Please avoid direct strong sunlight to SPC flooring if subfloors are plywood. The curtain is really helping. Please to know if spc (Stone polymer composite) cupping, bulk, or warping because of sub-floor plywood warranty do not cover. 

Strong sunlight will take temperature rises, then the flooring will be expanding on both width and length, and SPC (Stone polymer composite) will be cupping, bulk or warping, or bulge up. Please avoid direct strong sunlight to SPC flooring. We do not cove by warranty.

If you should be installing Stone polymer composites in a strong sunlight room we are recommending leave 10mm/10meters on each side of the flooring expansion and curtain.

If flooring is not acceptable, do not install the floor. Please contact the seller immediately and arrange for replacement. Industry-standard allows up to 5% of material may be culled for blemishes or defects without being considered defective. Please note our products contain a standard pattern variation and installers should be working from multiple open boxes to ensure boards are blended throughout. The manufacturer cannot accept responsibility for the installation of flooring with visible defects. Installation of this product warrants the acceptance by the installer or owner for the quality of the material, as well as conditions in which the material is being installed therein.

It is the Installer/Owner’s responsibility to ensure that the conditions are acceptable prior to the installation of the flooring. The manufacturer declines any and all problems associated with the flooring that is related to or attributed to improper Jobsite conditions. Any splits, cracks, grain raising, checking, edge fracturing, splintering, cupping, crowning/peaking, warping, twisting, expansion/contraction, telegraphing, buckling or chipping that occurs during or after the floor has been installed and as a result of abuse, misuse, improper maintenance or care, exposure to excessive or insufficient moisture, improper installation technique and improper environmental conditions including excessive heat from radiant heat systems are not covered under the manufacturer’s warranty.

Prior to installation of any flooring, the installer must ensure that the Jobsite and subfloor meet the requirements of these installation instructions.

All necessary accessories, including trim, must be present at the job site prior to beginning installation. The manufacturer is not responsible for flooring failure resulting from unsatisfactory Jobsite and/or subfloor conditions.

When purchasing flooring, we recommend adding 5%-15% to actual square footage needed for cutting allowance and to compensate for culled material. It is acceptable that up to 5% of material be outside the range of acceptance and not be considered defective.

It shall be the responsibility of the Installer to document installation date, product SKU and Lot information, duration of product acclimation, flooring moisture content, subfloor moisture content, site relative humidity and site temperature. This information must be documented by the installer and a copy provided to the property owner to ensure product warranty coverage.

Failure to follow any and all of FLOORCO recommended installation guidelines will void warranty coverage.