This construction methodology for the swimming pool and jacuzzi installation consists of descriptive details and the installation sequence for guiding the employees of a pool installation company.
Scope of work covers the supply and installation of the Swimming Pool and Jacuzzi.
All materials used are in accordance with contract specifications and shall be submitted for approval before ordering.
Any requirements from Municipality shall be incorporated during supply and swimming pool installation and an Environmental permit shall be sought from them and returned granted before any works take place.
Materials used as per the project contract shall be extracted from the contract specification and approved drawings.
Quantity Surveyor in conjunction with the Project Manager shall incorporate these material parts, description, specifications and quantities in the procurement material log sheet.
The Project Manager in co-ordination with the Construction Manager shall ascertain the requirement of Municipality if any from time to time, and all such requirements shall be incorporated during the process of supply and Installation stages.
Following list is a summary of key materials to be used for Water Feature Construction (Swimming Pool and Jacuzzi).
- Sub base
- Polyethylene sheet ga1000 microns
- Reinforced concrete 20 N/mm² (blinding)
- 4mm thick SBS modified bituminous elastomeric water proofing membrane
- 180g/m² non-woven polyester reinforcement
- Protection Screed
- Steel bars
- Water stopper
- uPVC spacer
- Reinforced concrete 40 N/mm² (sub-structure)
- High strength free flowing micro concrete for structural repair
- 4mm cement bound water proofing sealing slurry
- 2mm flexible thin bed mortar tile adhesive
- 20 x 20 x 4mm non slip glass mosaic tiles
- Sandstone coping (SS-05 color : Honed finish with bull nose edge)
- Sandstone cladding (SS-05 color: Honed finish)
- Grout
- Sealant
- Conmix RCP color 5166
- uPVC pipes (Ducting/Sleeves)
- Stainless steel handrail
- Stainless steel slip proof treads
- Shuttering marine plywood
- Tie rod with wing nut
- Shoring rod
- Tie wire
Sequence of Work
Preliminary requirements
- Shop drawings preparation and approval
- Material submittals and Approval
- Approval of Method statement, Inspection Test Plan, Checklist and risk assessment etc.
- Site survey and project planning
- Mock up preparation and approval
- Site installation
- Inspection Testing and Approval
Shop Drawings Preparation and Approval
Preparation & Submission of the shop drawings submittal schedule shall be done in accordance with the Tender/Contract drawings, this shall be provided when contractor receives award of the contract notification.
Upon approval of drawing list design department shall prepare and check the project drawings taking into consideration the following factors;
Project requirements for the product and material that includes dimension details of product, material type, type of finish and quality of finish and/or workmanship.
Permissible tolerance
Product acceptance criteria
Aesthetic (Artistic) specifications and acceptance criteria.
Standardization of products.
According to the nature of the work, the Project Manager shall decide on the necessity to carrying out site measurements.
Preparation of shop drawings shall be in accordance to the schedule submitted.
Project/Construction Manager shall monitor the progress of shop drawings approved via the list of CONTRACTOR/CONSULTANT drawings for reference numbers and approval dates.
All approved shop drawings shall be stamped “Controlled” and shall be issued to the Engineers for site use.
Site survey shall be conducted whenever necessary by the surveyor and measurements shall be taken for any nonstandard items.
The Quantity Surveyor shall quantify the variations based on the approved shop drawings & site measurements.
Material Submittals Approvals
The Project/Construction Manager shall coordinate with the purchasing department to purchase and provide all the necessary approved materials and verification requirements as per contract specifications and contract requirements.
All incoming materials shall be subject to inspection/approval by the Quality Control Engineer. No material shall be withdrawn from stores or storage area before Inspection and approval from the QA/QC.
Stores shall receive the incoming materials to a designated holding area; checks shall be made for Quality and Quantity with any materials not conforming to be clearly labelled and stored separately awaiting QA/QC to follow the procedures of sub contractor’s suppliers NCR.
Material shall be handled manually where possible or when no mechanical measures are available in place i.e. forklifts or any other lifting device appropriate for the task.
Material handling within the stores containers shall be by hand only.
Handling of materials in open storage area shall be carried out mechanically to reduce risks involved in manual handling.
All operatives exposed to manual handling shall have undergone manual handling training.
Pallet bases to be checked to allow safe handling by forklift or telehandler.
No stacking of 2 different types of material in one pallet this also goes for stacking pallets; stacked pallets must be of the same material.
No more than 2 pallet loads per stack.
Stacking height should not exceed 3 meters.
Delivery, Storage and Handling
All records of stock materials at the storage area shall be recorded and labelled stating intended location for installation on the project.
All materials shall be marked and monitored by the store keeper.
Materials for each task/zone shall be stored separately.
Unless materials are near the intended installation area and are in the process of installation, materials shall be protected as appropriate.
Protective tapes/coverings shall be made to protect the stored materials of unique nature and specification, materials shall be stocked in groups to increase efficiency of site deliveries.
All hazardous materials shall be stored separately and to manufacturers recommendation in clearly marked COSHH boxes with MSDS and COSHH assessments for each item understood and signed by staff required to handle / work with it. This file shall be held in the site office and made available to CONTRACTOR/CONSULTANT upon request.
Purchasing Department shall liaise with the QS department and prepare a detailed material list for each item in accordance with the approved shop drawings.
The first sample of each item shall be submitted for approval and the production process shall continue as per schedule, each product / item shall be labelled with a unique number for its identity.
Supplier’s Quality control shall take care of the quality issues if any of the material once approved and passed by their QC team.
The materials shall then be stacked in pallets, protection wrapped around them awaiting delivery call off from site.
When materials delivered to site QA/QC and CONTRACTOR/CONSULTANT representative along with the storekeeper shall inspect all goods for conformity.
If a non-conformance arises the contractor shall issue the supplier with an NCR.
The store keeper and Logistics Team shall ensure safety and soft handling of all delivered materials.
Site Inspection
Prior to starting installation activities, each specified area shall be inspected by the survey team to ensure grading is in accordance with the approved specification for handover. If any discrepancies occur client shall be informed and a coordinated outcome shall prevail.
Only approved material shall be used.
Delivered material shall be stored at lay down area and shall always be subject to contractor consultant representative inspection.
Methods for Water Feature Construction
For Excavation, Trenching, Backfilling & Grading, Method Statement to be submitted separately.
For Irrigation Installation Work Method Statement to be submitted separately.
For Soft Landscaping Work Method Statement to be submitted separately.
For Electrical and Mechanical Installation, Method Statement to be submitted separately.
For Site Furniture work Method of Statement to be submitted separately.
For Thermal Moisture Protection Method Statement to be submitted separately.
Swimming Pool and Jacuzzi
For Setting Out, Excavation and Backfilling refer to Method: “Trenching, excavation, Backfilling and grading works.
Sub grade: Any loose material shall be compacted or removed, the site shall be wet down to ensure compaction and if required further with a plate compactor or vibrating roller.
Sub base: The sub base shall be compacted to not less than 98% maximum dry density determined in accordance with BS 1377 Part 4, field density tests shall be carried out at a frequency of 3 tests per 500m2 laid or as directed by the Engineer. Watering may be used to aid in compaction and if required compacted further with a Whacker plate and/or vibrating roller.
Polyethylene Sheet: After compaction and its test is completely done, Polyethylene sheet will be laid over the compacted sub base prior to blinding.
Blinding: The sub base shall be topped with a 100mm thick layer of concrete indicated in the approved drawing. Blinding shall be laid over the plastic gauge, polyethylene sheet, encasing the concrete bottom and sides and bottom.
Water Proofing & Protection Screed
The pool shall be waterproofed with an approved material, first by applying bituminous primer with the required coating, 4mm thick torched applied membrane and with a 3.2mm thick protection board.
Waterproofing shall be done strictly following manufacturers recommendation, project specifications and as per applicable standards.
The waterproofing shall be inspected and to be approved by the Contractor/Consultant.
Once the waterproofing works is completed a 50mm thick protection screed shall be applied over the waterproofing membrane.
Manufacturer recommendation shall be followed when screed is started.
Exposed concrete surface shall be finished using equipment suitable to produce the required finish.
Where necessary to protect the finish to the concrete surface the wet Hessian or plastic sheeting shall be supported off the surface of the concrete.
The concrete shall be cured continuously from the initial set by clean water ponding.
Minimum time required is normally 3 days, but curing for 7 days or longer shall be done if required.
After the concrete surface have achieved its final curing, waterproofing to be applied entirely on the concrete using approved material following the manufacturer’s recommendation on coating application.
Rebar and Formworks
A casting area shall be prepared on site in a designated area for the casting of the precast concrete base slab and wall of Pool/Jacuzzi.
Formworks that conforms to the dimension of the base slab and wall shall then be constructed; to ensure that the geometry does not change during the pouring process; bracers will be added to enhance the strength
The rebar for the formworks in the base Slab and wall shall be in accordance with the bending configurations and dimensions as per approved shop drawings and contract specification in preparation for pouring of the precast foundations Concrete slab & wall of the Pool/Jacuzzi.
Pool Shell (Reinforcement, Concrete & Waterproofing)
Pool/Jacuzzi shell shall be constructed initially by a 350mm thick base slab and 300mm thick concrete wall with the required size, dimension, and shape indicated in the approved drawing.
Cement and sand mixed mortar reinforced with wire mesh to be applied to form a fillet on floor and wall corners.
Upon completion of rebar and formworks of the wall and prior to concreting works, Piping works sleeves for the MEP shall be fixed with the necessary fittings as per the sizes and locations shown in the approved shop drawing and to be inspected and approved by the Contractor/Consultant.
Method of Render/Plaster (if Required)
Background Preparation
The fair‐faced concrete background should be thoroughly cleaned devoid of dust, loose particles, wood pieces, mould oil and grease and other related substances.
Remove all the imperfections from the surface to be rendered using 110v grinder.
The suction in the background of fair-faced concrete shall be thoroughly neutralized by applying clean potable water.
Free water on the surface shall be allowed to disperse before applying CP2.
Allow the water to evaporate completely before the application of the cement render/plaster.
The fixing of all attachments such as pipes, electrical fittings (if included in scope), and other related items shall be carried out before the rendering/plastering begins.
Mixing (Using Electric agitator)
RCP (5166) supplied in 50kg bag must be mixed with potable water only, in a clean plastic bucket or a clean non-corrosive, uncontaminated metal tub.
To ensure a homogeneous and uniform mix, an electric agitator or paddle mixer must be used.
The amount of water to be added is 9.50 litters per 50kg bag (i.e. approx. 19% by weight).
Add the RCP color to water, turn the content of the bag carefully and stir frequently.
Once mixed allow to stand for 5 minutes and mix again before applying.
No further water should be added to the mix.
Hard and set plaster should not be remixed.
Mixing (Using Render Electric pump)
Render electric pump with operating voltage of 440v (Certificate to be provided prior to use of machine), 3 Phase will also be utilized in some areas CP2/RCP supplied in 50 kg bag to be located to the Hooper by two operatives and should have necessary safety equipment to avoid any accident or safety violation.
Mounted on top of the Hooper is steel slashed for tearing off the bag.
The main hose is 10 meter long without any joint on it, the size of the hose is 25/40mm, from the machine up to the end and pressure is very low, any how to arrest the movement the hose is vertically to the work area through scaffolds and properly tied on the scaffolding ( if necessary).
Starting of the electric pump (inspect machine before try to start if it is having the safety mechanism working).
Once the pump utilizing is over on each day to be cleaned with water to avoid any clot in the hose and pump.
Fist up all water to be filled in the pump and circulate through the hose and remove it in the site where the main contractor provided for waste disposal.
All above said operation has to be carried out with proper PPE in use i.e. gloves, Eye protection glass, Overall, Helmet with face protection, Safety shoes, Rubber boots, etc.
Necessary barricades to be provided in the work area and around pumps are in motion.
Electric Pump Safety Measure:
- Store in dry area
- Proper earthing to be provided to avoid any electric shock.
- Tag certificate to be by 3rd party.
- 440v cables to be kept off ground-away from water.
CP2 (Grey)/RCP (5166) Application
Rush Coat: CP2 Grey shall be applied as a spatter dash/rush coat to a thickness of 4‐8mm.
A rough texture is to be obtained to provide a mechanical key for the next coat, a minimum of 48 hours has to elapse prior to the application of the second coat.
Water curing is an absolute must during this period.
Second (CP2 Grey ) / Final Coat (RCP 5166): With the second/final coat application, a one coat thickness from 8mm to 20mm can be build‐up land finished by felting or floating.
The finished plaster has to be water cured for a period of 2 days (3‐4 times daily).
Plaster machine is used and the plaster is applied in a continuous operation and finished manually to the specified thickness to meet the requirements of BS 5262/5492.
Curing: The render/plaster should be kept moist by curing for at least three to four days with gentle spray of potable water
Disposal of Waste:
All waste will be identified, segregated, handled, and disposed off in coordination with the main contractor regarding the designated areas for waste materials.
Waste material shall be loaded into a wheel barrow or waste tubs and removed to allocate waste points.
Areas and scaffolds shall be swept clean.
Burying or burning waste materials on site will not be permitted.
Washing waste materials down sewers or into waterways will not be permitted.
During handling and application of render plaster contractor shall provide protection for interface works.
Finishing (Mosaic Tiles)
The Mosaic tiles shall be fabricated into pattern as shown in the approved drawings, set on a 25mm thick bedding of grout using approved bonding additive as per specification.
Tiles shall be tapped into place using a non-marking rubber mallet to ensure a strong bond between all surfaces.
Joint spacing between the surfaces of the tiles may vary in accordance with the architects detail for each product.
Grouting shall be carried out in accordance with the specification using approved epoxy grouting mortar.
Care shall be taken when doing the grouting to ensure that any spills or excess material is cleaned up prior to being allowed to set.
Cracked or broken tiles shall not be laid.
Prior to grouting, the area shall be inspected by the QA/QC Controller and any tiles found to be cracked or broken shall be lifted and replaced.
Swimming Pool Steps
Pool/Jacuzzi steps shall be constructed with a Reinforced concrete as per the shape, size and dimensions indicated in the approved drawing.
Steps shall be topped with a 20mm thick plastering, waterproofed with approved waterproofing materials as per specification required and to be finished with Mosaic tiles approved materials.
Installation of Sandstone Cladding
Area to be cladded will be cleaned from dust and other foreign materials.
Setting out for cladding will be done on wall from the coping level.
Epoxy glue will be applied to the sandstone for effective bonding.
3mm joint will be maintained for every sandstone.
Sandstone finishes will be sealed with approved sealant prior to inspection.
Scaffoldings will be provided for walls to be cladded over on height of 1 meter.
Installation of Sandstone Coping:
Area to be coped with sandstone will be cleared from dust, greasy materials and others.
Setting out for coping will be done as per approved drawings.
Mortar will be made in site in accordance to the specification with mixer machine.
Mortar bed will be laid over the cleaned concrete surface, proper levelling will be done by land edge.
Cement slurry will be spread over the mortar bed before installation of sandstone.
Sandstone coping will be placed over the slurry mortar bed as per pattern approved.
Sandstone coping will be levelled with rubber hammer to attained require level and bonding.
3mm joint will be maintained for every sandstone.
Sandstone finishes will be sealed with approved sealant prior to inspection.
Testing and Commissioning
The systems will be tested and commissioned to ensure they are in accordance with, the requirements of the specifications, drawings, relevant guidelines, standards and to the satisfaction of the Supervision Consultant including the HSE requirements.
Method Statement for Cast in Place Concrete
Sub grade: Any loose material shall be compacted or removed. The site shall be wet down to ensure compaction and if required further with a plate compactor or vibrating roller.
Sub base
The sub base shall be compacted to not less than 95% maximum dry density determined in accordance with BS 1377 Part 4.
Field density tests shall be carried out at a frequency of 2 tests per 1000m2 laid or as directed by the Architect.
Watering may be used to aid in compaction and if required compacted further with a Whacker plate and/or vibrating roller.
The application of levelling mortar shall only be done according to construction drawing details, spread over the compacted sub base materials before concrete pouring.
Concrete grade and supply
Concrete strength shall be as stipulated in the contract specifications or as detailed in the approved drawings, supplied by offsite batching plants and delivered to site in concrete agitator trucks.
Lean concrete if less than 1m3 shall be mixed on site.
The components and ratio to mix concrete shall be ensured.
Concrete shall be pre-ordered 24 hours in advance of the pour then confirmed of the day of the pour with the delivery time, quantity and grade.
Two methods or a combination of methods may be used to place concrete depending on access, volume of pour, conditions at the time and the structure being poured.
Concrete shall be poured by direct discharge from the truck, using a static or truck mounted concrete pump.
Embedded items: Prior to concreting a pre-pour inspection shall be carried out to check cleanliness, formwork and false work if any.
Reinforcement bars and dowels; reservation holes for later installations e.g. hand rails, balustrades, tree wells and lighting fixtures; utilities and other underground requirements shall be fulfilled and rechecked ahead of pouring.
Pouring concrete
Concrete shall be placed in a controlled manner and at a rate to ensure that undue pressure is not exerted on the shutters and those cold joints do not form.
A polythene sheet shall be laid over the sub base surface prior to pouring to avoid water penetration under the paving.
Whatever is the physical method of getting the concrete into place, it must keep the chute low and close to the placed concrete and not to drop it or drag it too far.
Concrete shall not be allowed to fall freely more than 1.5 meter to keep concrete in the correct consistency and avoid any segregation.
Concrete shall be vibrated in order to remove the entrapped air voids and to ensure complete filling of the forms.
The process of reducing entrapped air inside the concrete is called consolidation, which is normally achieved through the use of mechanical vibrators.
For vibrating Poker vibrators (compressed air driven) shall be used.
Sampling and Testing
Sampling and testing of the concrete shall be carried out by independent testing laboratory.
Testing and sampling frequencies shall be performed in accordance with the standards and contract specifications.
The concrete mixed temperature at discharge from the concrete agitator truck shall not exceed 32°C.
Concrete QA Inspector shall check and record the concrete temperature each time a slump test is taken.
If the concrete temperature exceeds 32°C at the point of placement, it shall be rejected.
During the pour, concrete placement temperatures are to be regularly reported back to the Concrete Batch Plant even if the temperature is below 32°C.
Finishing and curing
Exposed concrete surfaces shall be finished using equipment suitable to produce the required finish.
Where necessary to protect the finish to the concrete surface the wet Hessian or plastic sheeting shall be supported off the surface of the concrete.
The concrete shall be cured continuously from the initial set by clean water ponding.
Minimum time required is normally 3 days, but curing for 7 days or longer shall be done if required.
Each area shall be offered for inspection before installation and after completion.
Subcontractor representative shall be available at site to supervise and monitor the work area.
Inspection & Testing shall be done in accordance with the approved “Inspection & Test Plan” and check list signed off.
All materials & equipment shall be delivered to site wrapped in protection as per manufacturer’s practice.
Protection shall only be removed to conduct material quality control procedures or when installation of material is on-going.
All installed materials/items shall be protected as far as reasonably practicable after installation and shall remain in that state until final handover to contractor/consultant/client.