Ceramic tile adhesives within the Gulf region, GSO ISO 13007-1:2012

 

GSO full form GCC Standardization Organization

Key Requirements of GSO ISO 13007-1:2012

Category	Description
Adhesive Classification	- C: Cementitious Adhesives - D: Dispersion Adhesives (ready-to-use) - R: Reaction Resin Adhesives (based on synthetic resins)
Performance Class	- C1: Normal Cementitious Adhesive (Adhesion strength ≥ 0.5 MPa) - C2: Improved Cementitious Adhesive (Adhesion strength ≥ 1.0 MPa) - D1: Normal Dispersion Adhesive (Adhesion strength ≥ 0.5 MPa) - D2: Improved Dispersion Adhesive (Adhesion strength ≥ 1.0 MPa) - R1: Normal Reaction Resin Adhesive (Adhesion strength ≥ 0.5 MPa) - R2: Improved Reaction Resin Adhesive (Adhesion strength ≥ 1.0 MPa)
Tensile Adhesion Strength	- C1: ≥ 0.5 MPa - C2: ≥ 1.0 MPa - D1: ≥ 0.5 MPa - D2: ≥ 1.0 MPa - R1: ≥ 0.5 MPa - R2: ≥ 1.0 MPa
Open Time	Minimum of 20 minutes
Slip Resistance	Maximum 0.5 mm (for wall applications)
Deformability	S1: Deformable (able to accommodate slight movements, up to 2.5 mm) - S2: Highly Deformable (able to accommodate larger movements, up to 5 mm)
Fast-Setting Properties	Optional, for faster handling and setting time

Let me know your comments

Testing Process for Water Cleanability (ANSI A118.3 – Section 5.1) - epoxy grout and adhesive

ANSI A118.3-5.1 specifies the water cleanability test for epoxy tile grouts/adhesives, ensuring they can be effectively cleaned with water during installation. Here’s a step-by-step breakdown of the process:

---

Objective:

To evaluate how easily excess grout can be removed from tile surfaces using water before it hardens.

---

Test Procedure:

1. Sample Preparation

• Use standard ceramic tiles (as per ANSI specifications).
• Apply the epoxy grout/adhesive over the tile surface, spreading it using a rubber float or trowel.
• Ensure the grout fills the joints properly and covers a portion of the tile surface.

2. Cleaning Process

• After 30 minutes of application, use a clean sponge and water at room temperature (23°C ± 2°C or 73°F ± 4°F).
• Wipe the tile surface gently to remove excess grout.
• Repeat the cleaning process if necessary using only water.

3. Visual Inspection

• After the tile is cleaned and dried, examine the surface for any residual grout/adhesvie haze or staining.
• The grout should be removable with water, leaving no significant haze behind.

4. Acceptance Criteria

• If the grout cannot be cleaned with water within 30 minutes, it fails the test.
• The grout should not leave a permanent residue on the tile surface after cleaning.

Let me know your comments below, if any.

American national standard specifications for modified epoxy emulsion mortar/grout A118.8 — 1999

This specification describes the test methods and the minimum requirements for modified epoxy emulsion mortar/grout. The chemical and solvent resistance of these mortars/grouts tends to be better than for organic adhesives, on a par with latex-Portland cement mortars, but not designed to meet the requirements for ANSI A108.6 and ANSI A118.3.

Requirement of ANSI 118.8 - Tests for application properties:

J-5.1 Water cleanability: Not less than 40 minutes
J-5.2 Initial set: Not less than 3 hours nor more than 7 hours. (By Gilmore Needles (ASTM C266) using mortar as prepared in J-4.1.)
J-5.3 Final set: Not less than 9 hours nor more than 16 hours.
J-5.4 Bond strength to quarry tile - Requirement: Average shear bond strength to quarry tile shall be greater than 300 psi (21 kg/cm2)
J-5.5 Shear strength of mortars to glazed wall tile:
    7-day shear strength: greater than 200 psi (14 kg/cm2).
    7-day water immersion shear strength: greater than 150 psi (10.5 kg/cm2).
    4-week shear strength: greater than 250 psi (17.4 kg/cm2).
    12-week shear strength: greater than 250 psi (17.4 kg/cm2).
J-5.6 Shear strength of mortars to impervious ceramic mosaic tile
    7-day shear strength: greater than 150 psi (10.5 kg/cm2).
    7-day water immersion shear strength: greater than 100 psi (7 kg/cm2).
    4-week shear strength: greater than 150 psi (10.5 kg/cm2).
    12-week shear strength: greater than 150 psi (10.5 kg/cm2).
J-5.8 Comprehensive strength of the cured material: Greater than 2600 psi (183 kg/cm2).
J-5.9 Tensile strength of the cured material: Greater than 300 psi (21 kg/cm2).
J-5.10 Flexural strength Requirement:
    Modulus of rupture greater than 850 psi (60 kg/cm2).
    Modulus of elasticity not greater than 1.5 x 10^6 psi (1.1 x 10^5 kg/cm2).
J-5.12 Water absorption: 

    50 percent relative humidity to immersion – less than 5.0%
    Immersion to dry – less than 7.0%

Write your comment below....

MENA, American, and European Building Codes

 

1. MENA Building Codes (Middle East & North Africa)

MENA countries adopt a mix of international codes (IBC, BS, Eurocodes) with modifications for local conditions.

Saudi Arabia

• Saudi Building Code (SBC) – Based on IBC, NFPA, and ACI
  • SBC 101 – General Building Requirements
  • SBC 201 – Structural Requirements
  • SBC 301 – Loads & Forces
  • SBC 401 – Excavation & Foundations
  • SBC 501 – Concrete Structures (based on ACI 318)
  • SBC 601 – Masonry Structures
  • SBC 701 – Steel Structures (based on AISC)
  • SBC 801 – Timber Structures
  • SBC 1001 – Fire Protection (based on NFPA)
  • SBC 1101 – Energy Conservation

United Arab Emirates (UAE)

• UAE Fire and Life Safety Code of Practice
• Abu Dhabi International Building Code (ADIBC) – Based on IBC
• Dubai Building Code (DBC) – Aligned with IBC & British Standards

Egypt

• Egyptian Building Code
  • ECP 203 – Concrete Structures (based on ACI 318)
  • ECP 205 – Soil Mechanics & Foundations
  • ECP 207 – Masonry Structures
  • ECP 208 – Seismic Design
  • ECP 209 – Steel Structures

Other MENA Countries

• Qatar Construction Standards (QCS 2014)
• Kuwait Building Code (KBC)
• Oman Building Regulations

---

2. American Building Codes (USA)

The United States uses both national and state-specific codes. The most widely adopted are:

General Building & Structural Codes

• International Building Code (IBC) – Published by ICC
• International Residential Code (IRC) – ICC
• ASCE 7 – Minimum Design Loads & Associated Criteria
• ACI 318 – Building Code for Structural Concrete
• AISC 360 – Specification for Structural Steel Buildings
• ANSI A117.1 – Accessibility Standards

Fire Protection & Safety Codes

• NFPA 101 – Life Safety Code
• NFPA 5000 – Building Construction & Safety Code
• NFPA 70 (NEC) – National Electrical Code

Energy & Sustainability Codes

• IECC (International Energy Conservation Code)
• ASHRAE 90.1 – Energy Standard for Buildings
• LEED Certification (Voluntary)

Specialized Codes

• ADA (Americans with Disabilities Act) – Accessibility Requirements
• AISC 341 – Seismic Provisions for Structural Steel
• ACI 350 – Environmental Engineering Concrete Structures

---

3. European Building Codes

Europe follows the Eurocodes (EN 1990 – EN 1999) for structural design and various EU directives for sustainability.

Eurocodes (Structural Design Standards)

• EN 1990 – Basis of Structural Design
• EN 1991 – Actions on Structures (Wind, Snow, Seismic, Fire)
• EN 1992 – Design of Concrete Structures
• EN 1993 – Design of Steel Structures
• EN 1994 – Composite Steel & Concrete Structures
• EN 1995 – Timber Structures
• EN 1996 – Masonry Structures
• EN 1997 – Geotechnical Design (Foundations & Soil Mechanics)
• EN 1998 – Seismic Design of Structures
• EN 1999 – Aluminum Structures

Other European Standards & Regulations

• EPBD (Energy Performance of Buildings Directive) – Sustainability
• EN 13501 – Fire Classification of Construction Products
• ISO 45001 – Occupational Health & Safety
• BS 9999 – Fire Safety in Building Design & Use (UK)

ASTM C267-1982: Standard Test Methods for Chemical Resistance of Mortars, Grouts, and Monolithic Surfacings and Polymer Concretes

ASTM C267-1982 outlines standard test methods to evaluate the chemical resistance of mortars, grouts, monolithic surfacings, and polymer concretes when exposed to various chemical environments. The test procedure generally involves the following steps:

1. Sample Preparation

• Prepare specimens of the test material according to the standard dimensions and curing conditions specified in the standard.
• The samples must be properly cured to ensure they reach the desired mechanical properties before exposure to chemicals.

2. Selection of Chemical Reagents

• The specimens are exposed to a variety of chemical solutions, which may include acids, alkalis, solvents, and other aggressive substances depending on the intended application of the material.

3. Immersion and Exposure

• The test specimens are immersed or partially immersed in the selected chemical reagents.
• The exposure time varies and is determined based on the specific test requirements. Common durations include 7 days, 28 days, or longer.

4. Evaluation Criteria

After the exposure period, the specimens are assessed for changes in:

• Weight Loss or Gain – Determined by weighing the specimens before and after exposure.
• Dimensional Changes – Measured to evaluate expansion, contraction, or surface degradation.
• Surface Condition – Visual inspection for signs of cracking, softening, discoloration, or other surface changes.
• Strength Testing – Mechanical strength tests (compressive, flexural, or tensile strength) may be performed before and after chemical exposure to assess the material's degradation.

5. Data Recording and Reporting

• The test results, including weight changes, visual observations, and mechanical property variations, are recorded and analyzed.
• Results are compared to control samples to determine the level of chemical resistance.

Conclusion

ASTM C267-1982 provides a standardized method to assess the durability of construction materials when exposed to harsh chemical environments. The test helps engineers and material scientists select appropriate materials for applications requiring high chemical resistance.

Would you like further details on specific chemicals or testing conditions, please comment below.

Tile installation in the FRP pools

What is FRP Pool?

FRP (Fiberglass Reinforced Plastic) pools are swimming pools made from a combination of fiberglass and plastic resin, reinforced with a layer of fiberglass cloth. This type of pool is known for being durable, lightweight, and resistant to corrosion, which makes it an ideal choice for both residential and commercial pool installations. Here’s a breakdown of what makes FRP pools distinct:

Key Features of FRP Pools:

1. Material Composition:

   • Fiberglass: The primary material used in FRP pools is fiberglass, a strong and lightweight material that provides excellent structural integrity and resistance to wear.
   • Reinforced Plastic Resin: The fiberglass is bonded with a resin (typically polyester or vinyl ester), which creates a smooth, non-porous surface that resists algae growth and is easy to maintain.

2. Durability:

   • FRP pools are highly durable and resistant to cracking, fading, and corrosion. Unlike concrete pools, which can suffer from cracks and require frequent repairs, FRP pools retain their strength and aesthetic appeal for many years.
   • They are especially resistant to the chemicals commonly used in pool maintenance, making them an excellent choice for long-term use.

3. Ease of Installation:

   • FRP pools are pre-fabricated in a factory and delivered as a single, molded unit. This means they can be installed much faster than traditional concrete pools, typically in just a few days or weeks, compared to months for concrete pools.
   • Installation involves excavating the site, placing the pre-formed pool shell, and connecting the plumbing and electrical systems.

4. Low Maintenance:

   • The smooth surface of FRP pools makes them less prone to algae growth and dirt accumulation. This reduces the need for frequent cleaning and chemical treatments.
   • They are also resistant to staining from pool chemicals, which helps maintain the pool's appearance over time.

5. Aesthetic Appeal:

   • FRP pools are available in various shapes, sizes, and colors. The smooth, glossy finish provides a modern and sleek look, and the surface stays clean and shiny for years.

6. Cost-Effective:

   • Although FRP pools are generally more expensive than vinyl liner pools, they are often more affordable than custom concrete pools when factoring in the long-term maintenance and durability.

Types of FRP Pools:

• Above-Ground FRP Pools: These are made for above-ground installations, offering all the benefits of FRP, including easy maintenance and fast installation.
• In-Ground FRP Pools: These are custom-designed for in-ground installations and are made to blend seamlessly into your landscape design.

Benefits of FRP Pools:

• Quick Installation: As mentioned, FRP pools come as pre-molded units, so installation is much faster than other types of pools.
• Low Maintenance and Cleaning: The non-porous surface of FRP makes it resistant to algae and stains, making cleaning and maintenance easier.
• Long-Lasting: With proper care, FRP pools can last for decades without the need for major repairs.
• Energy Efficient: The smooth surface reduces friction in the water, which can help with energy efficiency, especially when used in conjunction with efficient pool pumps and heaters.

Tiling on FRP Pools:

Fiberglass Reinforced Plastic (FRP) pools are known for their durability, but to maintain their performance, proper installation is crucial. When applying epoxy adhesive to bond FRP panels or addressing deflection issues, following the right precautions ensures a strong and lasting result. Here's a guide to help you with the process.

1. Surface Preparation for Epoxy Adhesive Application

• Clean Thoroughly: Before applying the epoxy adhesive, make sure the FRP panels are clean. Use a mild detergent or degreaser to remove any grease, dirt, or oil, and allow the surface to dry completely.
• Scuff the Surface: Lightly sand the FRP with fine-grit sandpaper (80-120 grit) to create a rough surface that helps the adhesive bond better.

2. Choosing the Right Epoxy

• Select a Suitable Epoxy: Choose an epoxy that is designed specifically for bonding FRP materials. Ensure that the adhesive is waterproof or rated for underwater use if it's going to be applied in submerged areas of the pool.
• Check Waterproofing: If you're applying epoxy in an underwater or water-exposed area, make sure the product is rated for such conditions.

3. Mixing and Application

• Follow Mixing Instructions: Always mix the resin and hardener according to the manufacturer’s instructions. Incorrect ratios can result in a weak bond or improper curing.
• Even Application: Apply a thin, even layer of epoxy to the surface. Avoid using too much adhesive, as it can cause issues with bonding.

4. Temperature and Humidity Considerations

• Ideal Curing Conditions: Epoxy adhesives cure best at temperatures between 50-90°F (10-32°C). Avoid applying epoxy in extreme temperatures or high humidity.
• Allow Adequate Curing Time: Let the adhesive cure completely before exposing it to any load or moisture. Premature exposure can compromise the bond.

5. Ventilation and Safety Precautions

• Work in a Well-Ventilated Area: Epoxy adhesives emit fumes that can be harmful. Always work in a well-ventilated area or wear a respirator if necessary.
• Wear Protective Gear: Protect your skin and eyes by wearing gloves, goggles, and long sleeves when working with epoxy. Wash off any epoxy that contacts your skin immediately.

6. Addressing Deflection During Installation

Deflection refers to the bending or movement of FRP panels under load. Excessive deflection can weaken the adhesive bond and damage the panels. Here are the steps to minimize deflection during installation:

Proper Support and Framing

• Ensure Proper Support Spacing: Make sure the panels are supported adequately. Follow the manufacturer's guidelines for the spacing of supports to prevent excessive deflection.
• Strong Substructure: Use a robust and level substructure to support the panels. This will prevent them from sagging or bowing under their own weight or external forces.

Reinforcing the FRP Panels

• Use Reinforcements: For larger spans or areas expected to bear heavy loads, consider adding metal or composite reinforcements behind the panels to minimize deflection.
• Consider Ribbed Panels: Some FRP panels come with built-in ribs for added strength. These are ideal for high-stress areas where deflection might be a concern.

Deflection Limits and Monitoring

• Check Manufacturer’s Guidelines: Always follow the manufacturer’s recommended deflection limits. Exceeding these limits can lead to structural issues.
• Monitor During Installation: Keep an eye on the panels during installation to make sure they aren’t deflecting beyond acceptable limits. Adjust support spacing if necessary.

Thermal and Moisture Considerations

• Account for Temperature Changes: FRP panels can expand and contract with temperature fluctuations. Ensure the support system allows for this movement to avoid bending or deflection.
• Prevent Water Accumulation: Make sure that water doesn’t collect behind or beneath the panels, as moisture can contribute to deflection.

7. Post-Installation Checks and Maintenance

• Inspect for Pre-Deflection: Before installation, inspect the panels for any pre-existing warping or defects. This ensures the adhesive will bond properly and that the panels remain stable.
• Monitor for Deflection: After installation, regularly check the panels for signs of deflection or sagging, especially in areas that bear heavy loads.

Conclusion

Proper preparation, the right adhesive, and support are key to ensuring that your FRP pool panels are securely bonded and free from deflection issues. By following these precautions, you'll ensure a strong and lasting result for your pool, with panels that perform well for years to come.

CONCRETE UNIT MASONRY - TMS 602/ACI 530.1/ASCE 6

  

Key requirement of TMS 602/ACI 530.1/ASCE 6 sections or related standards:

Component	Type	Minimum Strength Requirement	Reference Standard
Masonry Units (CMU)	Concrete Masonry Units (CMU)	2,000 psi (13.8 MPa)	TMS 602/ACI 530.1/ASCE 6 Section 3
Masonry Units (Clay Bricks)	Solid Clay Bricks	2,500 psi (17.2 MPa)	TMS 602/ACI 530.1/ASCE 6 Section 3
Masonry Units (Stone)	Stone (e.g., limestone)	2,000 psi to 3,000 psi (13.8 MPa to 20.7 MPa)	TMS 602/ACI 530.1/ASCE 6 Section 3
Masonry Units (Lightweight)	Lightweight Concrete Blocks	1,500 psi (10.3 MPa)	TMS 602/ACI 530.1/ASCE 6 Section 3
Mortar Strength	Type M Mortar	2,500 psi (17.2 MPa)	TMS 602/ACI 530.1/ASCE 6 Section 4
Mortar Strength	Type S Mortar	1,800 psi (12.4 MPa)	TMS 602/ACI 530.1/ASCE 6 Section 4
Mortar Strength	Type N Mortar	750 psi (5.2 MPa)	TMS 602/ACI 530.1/ASCE 6 Section 4
Mortar Strength	Type O Mortar	350 psi (2.4 MPa)	TMS 602/ACI 530.1/ASCE 6 Section 4
Grout Strength	Fine Grout	2,000 psi (13.8 MPa)	TMS 602/ACI 530.1/ASCE 6 Section 5
Grout Strength	Coarse Grout	2,000 psi (13.8 MPa)	TMS 602/ACI 530.1/ASCE 6 Section 5
Tensile Bond Strength	Type M Mortar	50 psi (0.34 MPa)	TMS 602/ACI 530.1/ASCE 6 Section 4
Tensile Bond Strength	Type S Mortar	40 psi (0.28 MPa)	TMS 602/ACI 530.1/ASCE 6 Section 4
Tensile Bond Strength	Type N Mortar	30 psi (0.21 MPa)	TMS 602/ACI 530.1/ASCE 6 Section 4
Tensile Bond Strength	Type O Mortar	20 psi (0.14 MPa)	TMS 602/ACI 530.1/ASCE 6 Section 4
Tensile Bond Strength	Concrete Block (CMU)	50 psi (0.34 MPa)	TMS 602/ACI 530.1/ASCE 6 Section 4
Tensile Bond Strength	Clay Brick	40 psi (0.28 MPa)	TMS 602/ACI 530.1/ASCE 6 Section 4
Reinforcement Strength	Steel Reinforcement (Rebar)	60,000 psi (413.7 MPa) minimum yield strength	TMS 602/ACI 530.1/ASCE 6 Section 6
Shear Strength (Unreinforced)	Unreinforced Masonry Wall	100 psi (0.69 MPa)	TMS 602/ACI 530.1/ASCE 6 Section 7
Shear Strength (Reinforced)	Reinforced Masonry Wall	300 psi (2.07 MPa) minimum, depending on reinforcement	TMS 602/ACI 530.1/ASCE 6 Section 7

Key Points to Note:

• Masonry Units: The minimum compressive strength requirements for masonry units such as concrete blocks, clay bricks, and stone are found in Section 3 of the code.
• Mortar: Mortar strength requirements for different types (Type M, S, N, O) are specified in Section 4.
• Grout: The strength of fine and coarse grout is detailed in Section 5.
• Tensile Bond Strength: The required bond strengths for various types of mortar are also covered in Section 4.
• Reinforcement: The specifications for reinforcement strength (e.g., rebar) are found in Section 6.
• Shear Strength: The shear strength for both unreinforced and reinforced masonry walls are mentioned in Section 7.

Let me know your comments with additional details and clarifications below.

 

BHE Façade Specifications - Exterior Stone Cladding Requirements

BHE Façade Specifications stands for Bauer Hochbau Engineering. It is a company or organization that provides engineering and consulting services related to building structures, including façades, stone cladding, and other architectural elements.

The BHE Façade Specifications for Exterior Stone Cladding outline the technical requirements for materials, installation, and design for stone cladding systems used on building exteriors. While specific BHE Façade Specifications might vary, the general requirements for minimum and maximum specifications for stone cladding are as follows:

BHE Façade Specifications - Exterior Stone Cladding Requirements:

Specification Category	Minimum Requirement	Maximum Requirement
Stone Type	Durable, weather-resistant stone such as granite, limestone, marble, sandstone	High-strength natural stone with enhanced weathering properties
Compressive Strength of Stone	2,000 psi (13.8 MPa)	5,000 psi (34.5 MPa)
Thickness of Stone Panels	20 mm (0.8 inches)	50 mm (2 inches)
Panel Size	300 mm x 300 mm (12 inches x 12 inches)	1,200 mm x 1,200 mm (48 inches x 48 inches)
Stone Panel Weight	50 kg (110 lbs) per panel	100 kg (220 lbs) per panel
Fixing Systems	Mechanical fixing systems (anchors, clips)	Mechanical or adhesive systems, with anchors providing sufficient support based on wind load calculations
Minimum Anchor Spacing	600 mm (24 inches)	900 mm (36 inches)
Joint Width	6 mm (0.24 inches)	12 mm (0.47 inches)
Expansion Joints	Located at 10 m intervals, or as required by design	Based on the total length and temperature changes, typically every 6-8 m
Waterproofing and Drainage	10 mm drainage gap behind panels, proper waterproofing membrane behind stone cladding	Additional drainage provisions depending on exposure
Fire Resistance	Class A1 (non-combustible stone)	Fire-resistance up to 4 hours depending on the system and thickness
Wind Load Resistance	Capable of resisting a wind load of 1.5 kN/m² (31.7 psf)	Capable of resisting wind loads up to 3 kN/m² (63.4 psf)
Tensile Bond Strength	50 psi (0.34 MPa) for adhesive-bonded systems	Higher tensile strengths for mechanically fixed systems

Key Points and Clarifications:

• Stone Type: The stone selected for the cladding should be durable, resistant to weathering, and able to handle external environmental conditions, especially in coastal or industrial areas. Natural stones like granite, limestone, and sandstone are common choices.
• Compressive Strength: The stone should have a minimum compressive strength of 2,000 psi (13.8 MPa) to ensure durability and safety. Some projects may require higher-strength stone for added performance, particularly in severe climates or areas with heavy load-bearing requirements.
• Thickness and Weight: Stone cladding panels are typically between 20 mm to 50 mm thick, depending on the aesthetic and structural requirements. The weight of the panels is crucial to ensure the support structure (e.g., anchors and wall) is designed to bear the load.
• Fixing Systems: Mechanical fixing systems such as anchors, brackets, or clips are commonly used to secure the stone panels. Adhesive bonding systems are also utilized but must meet specific performance criteria.
• Wind Load Resistance: Depending on the height of the building and the geographical location (wind zones), stone cladding systems must be able to resist wind pressures. Minimum requirements typically call for resistance to 1.5 kN/m² (31.7 psf), but higher resistance may be necessary for buildings in high-wind regions or skyscrapers.
• Fire Resistance: The stone used in cladding should have a Class A1 fire rating, indicating that the material is non-combustible. Depending on the thickness and installation method, the system can provide up to 4 hours of fire resistance.
• Joint Width and Expansion Joints: The joint width between stone panels typically ranges from 6 mm to 12 mm (0.24 inches to 0.47 inches) to allow for thermal expansion and contraction. Expansion joints should be placed at appropriate intervals based on the size of the façade, typically at 6-10 meter intervals, to prevent cracking or movement.
• Waterproofing and Drainage: Proper waterproofing and drainage systems are essential to prevent water penetration behind the stone cladding, which could lead to structural damage. The typical drainage gap behind the panels is 10 mm or more to allow water to escape.
• Maintenance and Cleaning: Stone cladding systems should be designed to minimize cleaning requirements. If cleaning is necessary, it should be possible without damaging the surface or finish of the stone.

Let me know the comments below.