PREPARATION OF SURFACES Clause Samples
The "Preparation of Surfaces" clause defines the requirements and standards for readying surfaces before the application of finishes, coatings, or other treatments. It typically outlines the necessary cleaning, repair, and conditioning steps that must be performed to ensure surfaces are free from contaminants, defects, or irregularities. For example, this may involve removing old paint, filling cracks, or sanding rough areas. The core function of this clause is to ensure that subsequent work adheres properly and achieves the desired quality, thereby preventing future failures or defects due to inadequate surface preparation.
PREPARATION OF SURFACES. Before any other surface preparation is conducted, all surfaces shall be power washed to remove dust, salts, dirt and other contaminants. All wash water shall be contained, collected and tested in accordance with the requirements of NCDOT Managing Bridge Wash Water specification. Obtain approval of the Engineer and allow all cleaned surfaces to dry to the touch and without standing water before beginning surface preparation or painting activities. Surface preparation is done with materials meeting Article 1080-13 of the 2012 Standard Specifications. No silica sand or other silica materials are permitted for use. The profile shall be between 1.0 and 3.0 mils when measured on a smooth steel surface. Conduct and document at least 2 tests per beam/girder and 2 tests per span of diaphragms/cross bracing. Spread tarpaulins over all pavements and surfaces underneath equipment used for abrasive blasting as well as equipment and containers used to collect abrasive media. This requirement will be enforced during activity and inactivity of equipment. Before the Contractor departs from the work site at the end of the work day, collect all debris generated during surface preparation and all dust collector hoses, tarps or other appurtenances containing blasting residue in approved containers.
PREPARATION OF SURFACES. Remove plane works with a wooden scraper and smooth surfaces with sand paper No.2 Final and stop ▇▇▇▇▇ with paste filler prepared by mixing plaster of Paris and water to a creamy consistency and adding a raw seine in quantity required to match the surface. Alternatively patent filler as approved by GE may be used. When the surfaces dry up, wipe off superfluous filler, and set aside for 24 hours for the surface to ▇▇▇▇▇▇ rub surface with sand paper No.1/2 until it is thoroughly smooth and clean off.
PREPARATION OF SURFACES. The surface shall be prepared as specified under white washing and colour washing.
PREPARATION OF SURFACES. The surface shall be prepared by removing all mortar droppings and foreign matter and thoroughly cleaned with hair or fiber brush or other means as may be ordered by the Employer/Architects to produce an approved clean and even surface. All loose pieces and scales shall be scrapped off and holes, cracks etc. Stopped with mortar to match with the surrounding finish. The mortar should be cured sufficiently. In case where the surface have been previously white washed or color washed, the old white or color wash shall be entirely removed and surface broomed down before the new white wash is applied. In case the old white wash cannot be removed by brooming, the surfaces shall be cleaned by scrapping.
PREPARATION OF SURFACES. 17.6.1 The surface shall be thoroughly cleaned off loose particles, dust, dirt, efflorescence, chalking, grease, mortar drops and other foreign matter. The surface shall be sand papered with grade I abrasive paper and dusted off to achieve an even and smooth surface free from all dust particles. The contractor will use electric blowers for this purpose. If surface so obtained is uneven, it shall be brought to a perfectly even surface by applying external wall cave putty and allowing it to dry completely and then it shall be rubbed with the abrasive paper and dusted off and finally area cleaned by use of electric blower.
PREPARATION OF SURFACES. New surfaces - The surface shall be thoroughly cleaned of all dirt, dust, matter, drops and other foreign matter before white wash is to be applied.
PREPARATION OF SURFACES. 1. All surfaces shall be cleaned per SSPC-SP1 "Solvent Cleaning" to remove oil and grease prior to any other surface preparation.
2. After fabrication, prepare the following steel surfaces in accordance with SSPC-SP2 "Hand Tool Cleaning" or SSPC-SP3 “Power Tool Cleaning”:
a. Steelwork to be encased in concrete.
b. Steelwork to be hot-dip galvanized.
3. After fabrication, prepare the following steel surfaces in accordance with SSPC-SP3 "Power Tool Cleaning":
a. Interior steelwork to be painted with Type A Primer.
4. After fabrication, prepare the following steelwork in accordance with SSPC-SP6 "Commercial Blast Cleaning":
a. Steel to be painted with Type B primer.
b. Architecturally Exposed Structural Steel.
PREPARATION OF SURFACES. The surfaces shall be dry, free from dust, dirt, oil and other foreign material.
(a) Five layer treatment consisting of the following: A layer of cold bituminous primer at a rate of 400 gms per smt. A layer of special roofing asphalt (Hot) at a rate of 1.2 Kg. per square metre. A layer of bitumen felt Hessian base self finished type 3, grade 1 of approved makes. Minimum lap at the ends and sides of felt shall be 100 mm and 75 mm respectively and joints shall be sealed properly with bitumen. A layer of special roofing asphalt (Hot) at a rate of 1.2 Kg. per square metre. A layer of pea size gravel of 6 mm down size at a rate of 0.0006 cms per square metre.
(b) Seven layer treatment consisting of the following : The first four layers shall be same as the first four layers stated above in five layers treatment. The other layers shall be: Apply second layer of Hessian based self finished tarfelt, with minimum 100 mm and 75 mm lap at end and sides of strips. A layer of special roofing asphalt (Hot) at a rate of 1.2 Kg. per square metre. Apply final layer of pea gravel of 6 mm down size at a rate of 0.0006 Cmt./Smt. The contractor shall give guarantee against any leakage, and rectify any defect in water proofing, as mentioned in Bills of Quantities.
PREPARATION OF SURFACES. All surfaces to receive roofing shall be clean, dry, free from fins or projections and loose materials, and with cracks or voids filled with cement mortar.
PREPARATION OF SURFACES. Before any other surface preparation is conducted, all surfaces shall be power washed to remove dust, salts, dirt and other contaminants. All wash water shall be contained, collected and tested in accordance with the requirements of NCDOT Managing Bridge Wash Water specification. Obtain approval of the Engineer and allow all cleaned surfaces to dry to the touch and without standing water before beginning surface preparation or painting activities. Surface preparation is done with materials meeting Article 1080-13 of the 2012 Standard Specifications. No silica sand or other silica materials are permitted for use. The profile shall be between 1.0 and 3.0 mils when measured on a smooth steel surface. Conduct and document at least 2 tests per beam/girder and 2 tests per span of diaphragms/cross bracing. Spread tarpaulins over all pavements and surfaces underneath equipment used for abrasive blasting as well as equipment and containers used to collect abrasive media. This requirement will be enforced during activity and inactivity of equipment. Before the Contractor departs from the work site at the end of the work day, collect all debris generated during surface preparation and all dust collector hoses, tarps or other appurtenances containing blasting residue in approved containers. Clean a 3" x 3" area at each structure to demonstrate the specified finish, and the inspector will preserve this area by covering it with tape, plastic or some other suitable means so that it can be retained as the Dry Film Thickness (DFT) gauge adjustment standard. An acceptable alternative is for the Contractor to provide a steel plate with similar properties and geometry as the substrate to be measured. The contractor and or quality assurance representative shall notify the Engineer of any area of corroded steel which has lost more than 50% of its original thickness. All parts of the bridges not to be painted and the travelling public shall be protected from overspray. Submit a plan to protect all parts of bridge that are not required to be painted and a plan to protect the traveling public and surrounding environment while applying all coats of paint to a structure. Ensure that chloride levels on the surfaces are 7 µg/cm2 or lower using an acceptable sample method in accordance with SSPC Guide 15. The frequency of testing shall be 2 tests per span after all surface preparation has been completed and immediately prior to painting. Select test areas representing the greatest amou...