Table of Contents
A “Method of Statement for Protection Screed of Waterproofing Membrane” is a document or written procedure that outlines the step-by-step process for applying a protection screed over a waterproofing membrane in construction projects. This method of statement is typically prepared by the contractor or the construction team and serves as a guideline to ensure that the installation of the protection screed is carried out efficiently and according to the specified requirements.
During the project civil works associated with screeding, the Project Manager is ultimately responsible for the implementation of this method.
The Site Engineers are responsible for the appropriate execution, arrangement, coordination, and supervision of the work, quality, and delivery.
From batching, transporting, checking temperature and slump, and taking the necessary concrete test cube samples upon arrival at the site, the approved Concrete Ready Mix Supplier is responsible for the continuous delivery of the concrete as per the approved Concrete Design Mix & Project Specification requirements.
The Project QA/QC Manager and Engineers are responsible for ensuring that the Construction Team adheres to this Method of Statement for Protection Screed of Waterproofing Membrane and follows the site inspection procedures.
QA/QC Engineers are required to keep an eye on, verify, regulate, and record the quality of the concrete delivered to the site as well as the waterproofing membrane protection screed work during the casting process.
The implementation of the HSE plan at the work site will be ensured by a Safety Engineer or Safety Officer.
HSE Requirements
The protection of current utility services and employee safety should come first. Make sure that everyone involved is fully aware of the HSE policy of the organization.
Any machinery and equipment must only be operated by persons who have received proper training and experience.
At the project site, you will need to wear protective gear and equipment.
Any particular protective gear or equipment needed, as well as any signage referring to the wearing of helmets, eye protection, ear defenders, visibility vests, etc., shall be ordered and made available for usage on the site by the HSE engineer.
Any site regulations, such as the wearing of safety helmets, are made known to all the subcontractors.
When necessary, HSE will train employees on the proper handling and lifting of materials, especially when handling materials that potentially result in hand injuries.
The safety officer must issue a task risk assessment, which must be posted permanently in the working area.
Tools and Equipment
- Concrete Mixer: A concrete mixer is a vital piece of equipment used to combine cement, sand, and water in the correct proportions to create the protection screed mixture. These mixers come in various sizes, from small portable units for smaller projects to large, truck-mounted mixers for larger-scale applications.
- Trowels: Trowels are hand tools used by workers to apply and spread the protection screed over the waterproofing membrane. They come in different shapes and sizes, such as rectangular, pointed, or gauging trowels, depending on the specific requirements of the project and the surface being covered.
- Spirit Level: A spirit level, also known as a bubble level, is a precision tool used to ensure that the surface of the protection screed is leveled correctly. It helps in achieving a uniform thickness and a smooth, even finish, preventing any potential water pooling or unevenness.
- Straight Edge: A straight edge is a long, straight, and rigid tool that is used to screed and level the surface of the protection screed during application. It helps the workers achieve the desired thickness and a consistent surface plane.
- Gauging Rake: A gauging rake is a specialized tool with adjustable depth control used to apply the protection screed to a specific thickness. It helps the workers achieve an even thickness over the entire area.
- Brush or Broom: A brush or broom is used to create a textured finish on the protection screed surface. This texture enhances the bond with subsequent layers or finishes that may be applied over the protection screed.
- Measuring Instruments: Measuring tools, such as tape measures and rulers, are essential for accurately determining the dimensions of the area to be covered by the protection screed. Accurate measurements are crucial for calculating the right amount of materials required.
- Personal Protective Equipment (PPE): Workers involved in the installation of the protection screed must wear appropriate PPE, which may include safety goggles, gloves, dust masks, and protective clothing. PPE ensures their safety and minimizes exposure to potentially harmful substances.
- Water Sprayer: A water sprayer or curing compound may be used to keep the protection screed moist during the curing process. This helps prevent premature drying and ensures optimal strength development.
- Cleaning Equipment: Brooms, brushes, and cleaning materials are necessary for preparing the substrate before applying the protection screed. Proper surface preparation is essential for ensuring a strong bond between the protection screed and the waterproofing membrane.
Methodology for Waterproof Membrane Screed Protection
To make sure there is no damage or any subpar craftsmanship, inspection of the final layers of waterproofing should be done.
Only once the unacceptable condition has been corrected, proceed with concreting the protection screed at the necessary thickness of 50 mm.
In accordance with Manufacturer/Supplier recommendations, clean and prepare the waterproofing surface.
The only way to know if a product is safe is to test it out.
Establish the high level elevation of Concrete Protection Screed and the reference elevation from Surface Slab Level (SSL) in accordance with the approved shop drawing and specifications.
Install the approved gauge of polyethylene sheets in accordance with the waterproofing method statement.
Install the forms along the protection screed’s construction joints.
Obtain consulting engineers’ approval before applying or placing concrete.
Concrete Placement
Before placing an order for concrete to a ready mix supplier, consider the weather, such as hot, sandstorm, wet, or sunny.
For concrete bonding, pure water should be sprinkled on top of the polyethylene sheet layer.
Take the appropriate precautions for QC testing of concrete, such as slump testing, temperature testing, and volume testing, upon arrival of the ready-mix concrete at the concrete check point.
Use concrete mobile pumps or direct pouring with a chute to place ready-mixed concrete while adhering to the basic method statement for placing concrete.
Level the concrete in accordance with the approved screed level after the ready-mix concrete has been applied to the area.
Finish the screed’s surface in accordance with the requirements or with engineers’ approval.
Apply an approved curing agent or water curing as soon as the first set of concrete occurs, with consultant approval.
Quality Control Activity for Method of Statement for Protection Screed of Waterproofing Membrane
Check the ready mix concrete’s slump and temperature
Make sure the ready-mix concrete on site is of quality.
Ensure that a proper concrete cube sample is carried out in accordance with project specifications.
Make sure the pouring activity is done with high-quality workmanship and the necessary thickness.
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