SpecFlow Premium Self-Leveling Underlayment (Pack of 6)
SpecFlow is a cement-based non-shrinking self-leveling floor underlayment for interior use
SpecFlow is a high-quality, non-shrinking self-leveling underlayment that requires only mixing with water to produce a smooth, flat, hard surface. Feather-edge compatible and suitable for use under carpet, tile adhesives, and other floor finishes. Works best with SpecPrime primer.
Features
- Self-leveling — no troweling required
- Accepts foot traffic within 2–4 hours
- Apply from a featheredge up to 2" thick, or up to 5" with added pea gravel
- Pumpable for large-scale projects
- Superior bond strength to substrate
- Produces a smooth, blemish-free finish — no grinding or sanding needed
- Featheredge compatible without risk of chipping or spalling
- Compatible with adhesives for carpet, tile, and other floor coverings
Specifications
| Initial Set Time | 50 minutes at 70°F |
|---|---|
| Final Set Time | 80 minutes at 70°F |
| Compressive Strength | 3,000 psi at 1 day; 5,500 psi at 28 days |
| Bond Strength | 1,000 psi at 14 days (with SpecPrime) |
| Flexural Strength | 1,150 psi at 28 days |
| Yield | 0.50 cu. ft. per bag |
| Density | 125 lbs. per cubic foot |
| Coverage | ~24 sq. ft. per 50 lb. bag at 1/4" thickness |
| Packaging | 50 lb. bags |
| Shelf Life | 12 months in cool, dry storage |
Common Applications
Interior Floor Leveling
Used to correct uneven or damaged concrete slabs prior to flooring installation.
Commercial Flooring Prep
Ideal for retail, office, hospitality, and industrial interior floor systems.
Residential Renovations
Used in homes to prepare floors for tile, wood, laminate, or vinyl installation.
Subfloor Correction
Repairs and smooths imperfections in existing concrete substrates.
Recommended Substrates
SpecFlow is suitable for use over:
- Interior concrete slabs
- Properly prepared cementitious surfaces
- Primed substrates (using compatible primer systems)
- Sound, structurally stable interior floors
Application Instructions
Surface Preparation
- Surface must be clean, sound, and free of contaminants
- Remove dust, grease, paint, curing compounds, and loose material
- Mechanical profiling (shot blasting or equivalent) is recommended
- Use primer system where required for proper bonding
Priming
- Apply approved primer (such as SpecPrime) to ensure adhesion
- Allow primer to dry to proper tack condition before placement
Mixing
- Add clean water to mixing container first
- Slowly add SpecFlow powder while mixing
- Mix until smooth and lump-free consistency is achieved
- Do not overwater or retemper after mixing
Placement
- Pour or pump onto prepared surface
- Allow material to self-level naturally
- Use gauge rake or spreader for control if needed
- Work in sections for large areas
Curing
- Allow surface to cure according to site conditions
- Protect from rapid drying, drafts, or temperature extremes
- Flooring can typically be installed once fully cured and dry
Coverage Rates
- Approximately 24 sq ft per 50 lb bag at 1/4 inch thickness
- Coverage varies based on slab condition and application depth
Performance Characteristics
Flow Time
- Approximately 20 minutes working time at 70°F
Set Time
- Initial set typically within 1–2 hours depending on conditions
Strength Development
- High compressive strength suitable for interior flooring systems
Finish Quality
- Produces a smooth, flat surface requiring minimal or no grinding
Packaging
- 50 lb bags
- Pallet quantities available
Shelf Life & Storage
Shelf Life
- 12 months in unopened packaging
Storage Conditions
- Store in a dry, cool environment
- Keep bags sealed and off concrete floors
- Protect from moisture and humidity
Frequently Asked Questions
What is SpecFlow used for?
It is used to level and smooth interior concrete floors before installing tile, carpet, vinyl, or other flooring systems.
Does SpecFlow require troweling?
No. It is self-leveling and flows across the surface without manual troweling.
Can it be used outdoors?
No. SpecFlow is designed for interior applications only.
Do you need a primer before applying SpecFlow?
Yes, a compatible primer is typically required for proper bonding.
How thick can it be applied?
It can be applied from featheredge thickness up to typical leveling depths depending on project requirements.
How long before flooring can be installed?
Installation timing depends on environmental conditions and moisture levels, but it must be fully cured and dry.
Technical Data Summary (TDS)
Product Type
- Cement-based self-leveling underlayment
Use
- Interior floor leveling and smoothing
Working Time
- ~20 minutes at 70°F
Application Method
- Pour or pump
Coverage
- ~24 sq ft per 50 lb at 1/4"
Finish
- Smooth, flat cementitious surface
Use Location
- Interior only
Packaging
- 50 lb bags
Shelf Life
- 12 months
Safety Data Summary (SDS)
Hazard Information
SpecFlow may cause:
- Eye irritation
- Skin irritation
- Respiratory irritation from dust
- Serious eye damage with prolonged exposure
Recommended PPE
- Safety goggles
- Gloves
- Dust mask or respirator during mixing
- Protective clothing
First Aid
Eye Contact
- Flush with water for at least 15 minutes
Skin Contact
- Wash with soap and water
Inhalation
- Move to fresh air
Ingestion
- Seek medical attention if symptoms occur
Supporting Documents
Description
SpecFlow is a cement-based non-shrinking self-leveling floor underlayment for interior use
SpecFlow is a high-quality, non-shrinking self-leveling underlayment that requires only mixing with water to produce a smooth, flat, hard surface. Feather-edge compatible and suitable for use under carpet, tile adhesives, and other floor finishes. Works best with SpecPrime primer.
Features
- Self-leveling — no troweling required
- Accepts foot traffic within 2–4 hours
- Apply from a featheredge up to 2" thick, or up to 5" with added pea gravel
- Pumpable for large-scale projects
- Superior bond strength to substrate
- Produces a smooth, blemish-free finish — no grinding or sanding needed
- Featheredge compatible without risk of chipping or spalling
- Compatible with adhesives for carpet, tile, and other floor coverings
Specifications
| Initial Set Time | 50 minutes at 70°F |
|---|---|
| Final Set Time | 80 minutes at 70°F |
| Compressive Strength | 3,000 psi at 1 day; 5,500 psi at 28 days |
| Bond Strength | 1,000 psi at 14 days (with SpecPrime) |
| Flexural Strength | 1,150 psi at 28 days |
| Yield | 0.50 cu. ft. per bag |
| Density | 125 lbs. per cubic foot |
| Coverage | ~24 sq. ft. per 50 lb. bag at 1/4" thickness |
| Packaging | 50 lb. bags |
| Shelf Life | 12 months in cool, dry storage |
Common Applications
Interior Floor Leveling
Used to correct uneven or damaged concrete slabs prior to flooring installation.
Commercial Flooring Prep
Ideal for retail, office, hospitality, and industrial interior floor systems.
Residential Renovations
Used in homes to prepare floors for tile, wood, laminate, or vinyl installation.
Subfloor Correction
Repairs and smooths imperfections in existing concrete substrates.
Recommended Substrates
SpecFlow is suitable for use over:
- Interior concrete slabs
- Properly prepared cementitious surfaces
- Primed substrates (using compatible primer systems)
- Sound, structurally stable interior floors
Application Instructions
Surface Preparation
- Surface must be clean, sound, and free of contaminants
- Remove dust, grease, paint, curing compounds, and loose material
- Mechanical profiling (shot blasting or equivalent) is recommended
- Use primer system where required for proper bonding
Priming
- Apply approved primer (such as SpecPrime) to ensure adhesion
- Allow primer to dry to proper tack condition before placement
Mixing
- Add clean water to mixing container first
- Slowly add SpecFlow powder while mixing
- Mix until smooth and lump-free consistency is achieved
- Do not overwater or retemper after mixing
Placement
- Pour or pump onto prepared surface
- Allow material to self-level naturally
- Use gauge rake or spreader for control if needed
- Work in sections for large areas
Curing
- Allow surface to cure according to site conditions
- Protect from rapid drying, drafts, or temperature extremes
- Flooring can typically be installed once fully cured and dry
Coverage Rates
- Approximately 24 sq ft per 50 lb bag at 1/4 inch thickness
- Coverage varies based on slab condition and application depth
Performance Characteristics
Flow Time
- Approximately 20 minutes working time at 70°F
Set Time
- Initial set typically within 1–2 hours depending on conditions
Strength Development
- High compressive strength suitable for interior flooring systems
Finish Quality
- Produces a smooth, flat surface requiring minimal or no grinding
Packaging
- 50 lb bags
- Pallet quantities available
Shelf Life & Storage
Shelf Life
- 12 months in unopened packaging
Storage Conditions
- Store in a dry, cool environment
- Keep bags sealed and off concrete floors
- Protect from moisture and humidity
Frequently Asked Questions
What is SpecFlow used for?
It is used to level and smooth interior concrete floors before installing tile, carpet, vinyl, or other flooring systems.
Does SpecFlow require troweling?
No. It is self-leveling and flows across the surface without manual troweling.
Can it be used outdoors?
No. SpecFlow is designed for interior applications only.
Do you need a primer before applying SpecFlow?
Yes, a compatible primer is typically required for proper bonding.
How thick can it be applied?
It can be applied from featheredge thickness up to typical leveling depths depending on project requirements.
How long before flooring can be installed?
Installation timing depends on environmental conditions and moisture levels, but it must be fully cured and dry.
Technical Data Summary (TDS)
Product Type
- Cement-based self-leveling underlayment
Use
- Interior floor leveling and smoothing
Working Time
- ~20 minutes at 70°F
Application Method
- Pour or pump
Coverage
- ~24 sq ft per 50 lb at 1/4"
Finish
- Smooth, flat cementitious surface
Use Location
- Interior only
Packaging
- 50 lb bags
Shelf Life
- 12 months
Safety Data Summary (SDS)
Hazard Information
SpecFlow may cause:
- Eye irritation
- Skin irritation
- Respiratory irritation from dust
- Serious eye damage with prolonged exposure
Recommended PPE
- Safety goggles
- Gloves
- Dust mask or respirator during mixing
- Protective clothing
First Aid
Eye Contact
- Flush with water for at least 15 minutes
Skin Contact
- Wash with soap and water
Inhalation
- Move to fresh air
Ingestion
- Seek medical attention if symptoms occur
