The floor screeding process creates a level, stable and suitable base before contractors install tiles, vinyl, timber, laminate or other floor finishes. The process involves much more than spreading cement across a floor. Contractors need to inspect the substrate, establish the correct levels, prepare the surface, place and level the screed, allow enough curing time and check the finished surface before the next flooring stage begins.
In Singapore, homeowners also need to consider HDB renovation requirements when the work takes place in an HDB flat. HDB requires pre-packed screed for applicable dry-area floor works and sets additional waterproofing requirements for bathrooms, toilets, kitchens and open balconies.
If you first want to understand why screeding matters, read our main guide on the purpose of floor screeding.
The basic sequence looks like this:
inspect floor → prepare substrate → establish levels → apply bonding preparation → place screed → level and finish → cure → inspect → install flooring
What Is the Floor Screeding Process?
The floor screeding process is the sequence contractors follow to create the required floor surface before installing the final finish.
A typical process includes:
- Inspecting the existing substrate
- Checking floor levels
- Cleaning and preparing the base
- Setting level pegs or guides
- Creating drainage falls where necessary
- Applying the required bonding preparation
- Mixing or preparing the screed
- Placing the screed
- Levelling the surface
- Finishing the screed
- Allowing it to cure and dry
- Checking evenness, moisture, cracks and hollowness
- Preparing the floor for the final finish
The exact method can change according to the screed product, floor condition, final flooring and project specification.
For example, a bathroom floor may require a controlled fall toward a floor trap, while a living room floor may focus mainly on consistent level and floor height.
Why Does the Screeding Process Matter?
Good screeding creates the foundation for the flooring above it.
When contractors rush the process, the final floor may develop problems such as:
- Uneven levels
- High and low spots
- Poor tile alignment
- Visible imperfections beneath vinyl
- Cracks
- Hollow areas
- Poor drainage
- Mismatched floor heights
- Difficult transitions between rooms
A flooring installer can sometimes correct small irregularities later, but that approach cannot replace proper floor preparation.
The screed should already provide a suitable base before the final flooring goes down.
Step 1: Inspect the Existing Floor
The contractor should start by checking the condition of the existing floor.
This inspection helps answer a simple question:
Is the substrate suitable for screeding?
The contractor should look for:
- Cracks
- Loose concrete
- Existing coatings
- Dust
- Contamination
- Moisture
- Hollow areas
- Uneven levels
- Previous repair patches
- Existing flooring residue
The contractor should also determine the relationship between the floor and nearby areas.
For example:
- Does the bathroom need a lower finished level?
- Will the new floor meet an existing corridor?
- Does a doorway create a height restriction?
- Will different flooring materials meet at the same level?
These questions matter because screeding controls more than smoothness. It can also control the final floor build-up.
Step 2: Check the Required Floor Level
Next, the contractor establishes the level that the screed needs to achieve.
This step should happen before mixing or placing screed.
The contractor may use:
- Laser levels
- Spirit levels
- Straightedges
- Level pegs
- Other setting-out tools
BCA’s ceramic tiling good-practice guide shows contractors using level pegs before screeding so they can maintain a uniform surface.
The contractor should consider the complete floor system:
structural floor + screed + adhesive or underlay + final finish
If the contractor ignores the thickness of the final flooring, the finished level may end up too high or too low.
Step 3: Plan Falls for Wet Areas
A perfectly level floor does not suit every room.
Bathrooms, toilets, open balconies and other drainage areas may need a controlled slope so water moves toward a floor trap.
The contractor should establish that fall during the screeding stage.
This requires careful planning because the floor must achieve two goals at once:
- Maintain a suitable surface for the final finish
- Guide water toward the correct drainage point
Poor falls can create:
- Water ponding
- Slow drainage
- Wet corners
- Water moving in the wrong direction
For this reason, wet-area screeding requires more planning than simply levelling a dry bedroom or living room floor.
Step 4: Clean and Prepare the Substrate
A screed needs a suitable base.
The contractor should remove materials that could interfere with the screed system, such as:
- Dust
- Loose particles
- Debris
- Oil
- Paint contamination
- Weak surface material
If the screed relies on direct bonding to the floor, poor preparation can weaken that bond.
The contractor should also address obvious defects before covering the floor.
Putting screed over loose or unstable material does not solve the underlying problem.
Step 5: Repair Significant Defects Before Screeding
Minor surface variation often forms part of the reason for screeding.
However, major defects need separate attention.
The contractor should investigate:
- Significant cracks
- Loose substrate
- Active moisture
- Movement
- Serious deterioration
A screed should create the required flooring base. It should not act as a convenient cover for an unresolved structural or moisture problem.
If a defect affects the stability of the substrate, the contractor should resolve or assess that defect before continuing.
Step 6: Install Level Pegs or Screed Guides
Level pegs give the contractor reference points across the floor.
These references help control:
- Screed thickness
- Finished height
- Surface evenness
- Required falls
BCA’s floor-screeding sequence specifically illustrates the use of level pegs before contractors place the screed.
Without reliable reference points, the contractor may create a surface that looks smooth locally but changes level across the room.
That becomes especially important in larger spaces.
Step 7: Apply the Bonding Preparation Where Required
Some screed systems need a bond coat between the substrate and the screed.
BCA’s ceramic tiling guide shows a slurry bond coat applied with a brush or roller before contractors immediately place the screed mortar.
This step matters because a bonded screed relies on good contact with the substrate.
However, contractors should not use one bonding method for every product.
They should follow:
- Screed manufacturer instructions
- Project specifications
- Substrate requirements
Different systems can require different primers or preparation methods.
Step 8: Prepare the Screed Material
The contractor then prepares the screed according to the selected system.
Traditional screed may contain:
- Cement
- Sand or suitable aggregate
- Water
- Specified additives
However, HDB renovation work introduces an important local requirement.
HDB states that contractors must use pre-packed screed for applicable floor-finishing works. HDB describes pre-packed material as factory blended to the required proportions and ready for site use after workers add water.
This improves consistency and removes much of the variation associated with mixing separate components on site.
Step 9: Place the Screed
Once the base and material are ready, the contractor places the screed across the prepared floor.
The contractor should work systematically and maintain the planned:
- Thickness
- Height
- Falls
- Surface continuity
The screed needs to connect properly with the prepared substrate and follow the established level references.
The contractor should avoid random patches with different heights unless the floor design specifically calls for them.
Step 10: Level the Screed
After placement, the contractor levels the material to the required height.
BCA’s guide shows workers levelling screed with a timber or aluminium trowel against the established level references.
During this stage, the contractor should pay close attention to:
- High spots
- Low spots
- Doorways
- Corners
- Floor traps
- Adjoining rooms
- Thresholds
A floor can appear smooth while still having poor overall level control.
That is why the contractor should rely on measurement, not only visual judgment.
Step 11: Finish the Screed Surface
Once the contractor establishes the correct level, they finish the surface according to the needs of the final flooring.
The required surface can differ depending on whether the project will use:
- Tiles
- Vinyl
- Timber
- Laminate
- Another flooring system
The contractor should not necessarily create the same surface texture for every finish.
A substrate for vinyl, for example, may need tighter control of small surface imperfections because thin flooring can reveal ridges or patch marks.
Step 12: Protect the Fresh Screed
Fresh screed needs time to develop adequate strength.
People should avoid unnecessary traffic or disturbance during this stage.
The contractor should also protect the area from activities that could damage the new surface.
Common risks include:
- Heavy foot traffic
- Impact
- Early flooring installation
- Other renovation trades working across the floor
Good renovation scheduling matters here.
If multiple trades use the room before the screed reaches a suitable condition, they can damage the surface before the flooring installer arrives.
Step 13: Allow the Screed to Cure
i. Curing helps cementitious screed develop strength and stability.
ii. Curing and drying do not mean exactly the same thing.
iii. Curing refers to the process that allows the cementitious material to develop its intended properties.
Drying refers to moisture leaving the screed until it reaches a suitable condition for the next flooring system.
A screed may feel hard at the surface while still retaining significant moisture internally.
For ceramic tiling, BCA recommends that contractors allow the screeding base to air cure for at least seven days before laying floor tiles. BCA also tells contractors to follow manufacturer recommendations and check moisture after curing.
Do not apply that seven-day figure blindly to every flooring product.
Vinyl, timber and other moisture-sensitive flooring can have different requirements.
Step 14: Check the Screed for Cracks and Hollowness
Before the final flooring goes down, the contractor should inspect the screed.
BCA recommends checking for:
- Cracks
- Hollowness
- Floor evenness
- Moisture condition
Contractors should rectify unacceptable cracks or hollow areas before tiling.
This inspection matters because final flooring can hide the screed.
Once contractors install tiles or vinyl, repairing an underlying screed problem becomes more disruptive.
Step 15: Check Floor Evenness
A smooth-looking floor does not automatically meet the required evenness.
The contractor should check the surface with appropriate measuring tools.
For ceramic tiling, BCA’s good-practice guidance states that the floor should not show a gap greater than 3mm over 2 metres before tiling.
This figure relates to BCA’s ceramic-tiling good-practice guidance. It should not become a universal rule for every flooring material.
Other flooring manufacturers may specify their own tolerances.
The final flooring system should determine the acceptance criteria.
Step 16: Correct Remaining Surface Irregularities
If the screed does not meet the required evenness, the contractor may need further correction.
BCA notes that contractors may use self-levelling screed to correct floor evenness where necessary before tiling.
This does not mean every screeded floor needs self-levelling compound.
Contractors normally use it when the remaining irregularities require finer correction.
A useful distinction is:
| Floor Screed | Self-Levelling Compound |
|---|---|
| Builds floor level and height | Corrects smaller surface irregularities |
| Can form drainage falls | Usually aims for a flat surface |
| Can form a thicker floor layer | Often creates a thinner correction layer |
| Contractor manually establishes levels | Material flows more readily |
| Forms part of the main floor build-up | Often refines the final substrate |
Step 17: Check Moisture Before Final Flooring
Moisture matters because the next flooring material may trap it.
BCA advises contractors to check the moisture content after the screed has cured and notes that the permissible moisture level depends on the project requirements.
This becomes particularly important with:
- Vinyl
- Timber
- Laminate
- Adhesive-based flooring systems
A surface that looks dry does not necessarily contain little enough moisture for every floor finish.
The flooring manufacturer’s requirements should guide the final decision.
Step 18: Install the Final Flooring
Once the screed meets the required conditions, the flooring contractor can proceed with the final finish.
Possible finishes include:
- Ceramic tiles
- Homogeneous tiles
- Vinyl
- Timber
- Laminate
- Parquet
- Stone
The screeding process ends when the floor provides the correct foundation for the next system.
The flooring itself then follows its own installation requirements.
How Does the Floor Screeding Process Change in an HDB Flat?
HDB rules can affect both the material and floor build-up.
Dry Areas
HDB requires pre-packed screed for applicable dry-area floor work, including areas such as:
- Living rooms
- Dining rooms
- Bedrooms
- Storerooms
- Household shelters
Bathrooms and Toilets
For applicable bathroom and toilet floor-finishing work, HDB requires:
- Pre-packed waterproofing screed
- Waterproofing membrane
- Minimum 150mm membrane upturn against relevant walls, kerbs and pipes
- Appropriate floor-trap details
- A water test after replacement work finishes
Kitchens and Open Balconies
HDB requires pre-packed waterproofing screed before new floor finishes in kitchens and open balconies, along with specified waterproofing provisions around sanitary stacks where applicable.
The key point:
Contractors should not treat every room as if it needs the same screed system.
What About the 50mm HDB Limit?
HDB lists a 50mm combined thickness limit for floor finishes and screed in several renovation categories.
That does not mean:
Every individual screed layer must always stay below 50mm.
The rule applies to the complete floor build-up for the relevant work category.
A contractor should therefore consider:
- Screed thickness
- Tile or flooring thickness
- Adhesive or other system layers
- Existing floor condition
before setting the final level.
How Long Does the Floor Screeding Process Take?
There is no single duration for every project.
The overall timeframe depends on:
- Floor area
- Existing substrate condition
- Required screed thickness
- Room layout
- Wet or dry area
- Screed product
- Weather and ventilation
- Curing requirements
- Final flooring
The physical placement of screed may take much less time than the curing and drying period that follows.
This distinction matters.
A contractor may finish spreading and levelling the material quickly, but the floor may still need days or longer before the next flooring system can proceed.
Floor Screeding Process Before Tiles
When tiles will go on top, the contractor should focus on:
- Floor level
- Soundness
- Evenness
- Drainage falls where required
- Moisture condition
- Curing
BCA’s ceramic-tiling guidance requires contractors to inspect screed soundness and evenness before tiling and to address cracks or hollow areas first.
The tile installer then handles:
- Setting out
- Adhesive or mortar system
- Tile alignment
- Joints
- Final finish
Screeding and tiling form separate stages.
Floor Screeding Process Before Vinyl
Vinyl creates a different challenge.
Thin vinyl can reveal small imperfections underneath it.
The contractor should therefore pay particular attention to:
- Ridges
- Small depressions
- Patch marks
- Surface transitions
- Moisture
- Final flatness
A broad screed can establish the main floor level, while a finer smoothing or self-levelling layer may still become necessary before vinyl installation.
The vinyl manufacturer’s substrate requirements should guide that final preparation.
Common Floor Screeding Process Mistakes
Starting Without Checking Finished Floor Height
This can create poor transitions at doorways or adjoining rooms.
Screeding Over Dust or Loose Material
Poor substrate preparation can compromise the floor system.
Guessing the Level by Eye
Contractors should establish reference points before placing the screed.
Ignoring Wet-Area Falls
A visually flat bathroom floor can still drain poorly.
Treating Screed as Waterproofing
Wet areas often require a separate waterproofing system.
Using the Same Screed Specification Everywhere
Dry and wet areas can require different systems.
Installing Flooring Too Early
A hard surface does not guarantee suitable moisture conditions.
Skipping Final Evenness Checks
Small floor irregularities may become obvious after contractors install tiles or vinyl.
Covering Cracks or Hollow Areas
The contractor should address defects before the final flooring hides them.
Ignoring HDB Renovation Rules
HDB requirements can affect material choice, waterproofing and total floor build-up.
How Do You Know When the Screeding Process Is Complete?
The screeding stage does not end when the contractor finishes trowelling the surface.
The process reaches completion when the screed:
- Has achieved the planned level
- Maintains required falls
- Has cured sufficiently
- Meets the required moisture condition
- Shows acceptable evenness
- Has no unresolved cracks
- Has no unacceptable hollow areas
- Meets the requirements of the final flooring system
Only then should the next trade move forward.
Should You Screed a Floor Yourself?
Small DIY levelling jobs may look simple in videos, but full floor screeding requires accurate control over several variables.
A contractor needs to manage:
- Floor levels
- Thickness
- Material consistency
- Bonding
- Drainage falls
- Working time
- Surface finishing
- Curing
- Moisture
- Final tolerances
Wet areas add waterproofing and drainage requirements.
HDB renovation work also introduces local rules that homeowners need to follow.
For these reasons, full-room screeding generally suits experienced flooring or renovation contractors better than casual DIY work.
Where Does Friendly Painting SG Fit Into the Renovation Sequence?
Floor screeding belongs mainly to the flooring or renovation trade rather than normal painting work.
However, a renovation that includes screeding often affects nearby walls and ceilings.
After contractors complete major flooring work, homeowners may need:
- Wall patching
- Crack repair
- Surface preparation
- Ceiling painting
- HDB repainting
- Condo repainting
- Full-home painting
A practical renovation sequence often looks like:
floor preparation → screeding → flooring installation → wall repairs → surface preparation → final painting
This sequence reduces the risk of damaging freshly painted surfaces during heavy flooring work.
If you need painting after the flooring stage, see Friendly Painting SG’s HDB painting services or visit Friendly Painting SG.
Final Thoughts
The floor screeding process works best when contractors treat it as a controlled flooring stage rather than simply spreading mortar across concrete.
A reliable process follows this order:
inspect → prepare → establish levels → plan falls → bond where required → place → level → finish → cure → inspect → install flooring
Each stage affects the next.
Poor preparation can weaken the base. Incorrect levels can create bad transitions. Poor falls can cause drainage problems. Insufficient curing or moisture checks can affect the final flooring.
For Singapore homeowners, HDB requirements also matter. Pre-packed screed, waterproofing provisions and floor-build-up limits can apply depending on the room and renovation scope.
For the broader explanation of why homeowners use screed, how it differs from concrete and how HDB requirements affect floor build-ups, continue with our pillar guide: What Is the Purpose of Floor Screeding?.
Frequently Asked Questions About the Floor Screeding Process
What is the floor screeding process?
The floor screeding process involves inspecting and preparing the substrate, establishing levels, placing and levelling the screed, allowing it to cure, checking evenness and moisture, and preparing the surface for the final flooring.
What happens before floor screeding starts?
The contractor should inspect the substrate, identify defects, clean the floor, establish finished levels and determine whether the area needs drainage falls.
Why do contractors use level pegs during screeding?
Level pegs provide reference points that help contractors maintain the required screed height and floor surface across the room.
Does floor screeding require a bond coat?
Some bonded screed systems require bonding preparation. BCA’s ceramic-tiling guide illustrates a slurry bond coat before screed placement, but contractors should follow the requirements of the actual screed system.
How do contractors level floor screed?
They establish reference levels and use suitable straightedges or trowels to bring the screed to the required height and surface.
How long should floor screed cure?
The answer depends on the screed system and final flooring. For ceramic tiling, BCA’s good-practice guidance includes at least seven days of air curing for the screeding base before tile installation.
How flat should screed be before tiles?
For ceramic tiling, BCA good-practice guidance specifies no more than a 3mm gap over 2 metres before tiling. Other flooring systems may use different requirements.
Can contractors install vinyl directly over floor screed?
They can only do so when the screed meets the vinyl system’s requirements for surface condition, flatness, moisture and preparation. Some floors need an additional smoothing layer.
Does HDB require pre-packed screed?
Yes, HDB requires pre-packed screed for applicable floor-finishing works in dry areas and specifies waterproofing screed requirements for certain wet-area works.
Is floor screeding the same as self-levelling?
No. Floor screed can create the main floor build-up, establish height and form falls. Self-levelling compounds usually correct smaller surface irregularities or refine the substrate.
What comes after floor screeding?
After the screed has cured, dried and passed the necessary checks, contractors can prepare and install the final flooring system.