5-210 SECTIO N 519 – MEMBRAN E WATERPROOFING
519.0 1 DESCRIPTION . This work shall consist of the application of a membrane to bridge decks to serve
as a waterproof barrier between the concrete deck and the bituminous concrete surface pavement. This shall consist of either a torch applied membrane or a spray applied mem brane as required by the Contract . Torch applied membranes shall incorporate the use of a prime coat over the horizontal deck surface and an acceptable polyurethane liquid membrane on the lower portion of the curb face and adjacent deck area. Spray applied membranes shall incorporate a primer, the waterproofing membrane, tack coat, and any required aggregate.
519.0 2 MATERIALS . Materials shall meet the requirements of the following subsection s:
Waterproofing Membrane System, Type I ................................ ................................ 726.08(a) Waterproofing Membrane System, Type II ................................ ............................... 726.08(b) Spray applied membranes shall be a Type I waterproofing membrane system and torch applied membranes shall be a Type II waterproofing membrane system .
519.0 3 SUBMITTALS . The following information shall be pr ovided by the Contractor to the Engineer
prior to application of the membrane system:
a.Safety data sheets (SDS) and material detail sheets prepared by the membrane manufacturer, provided a minimum of 7 calendar day s prior to the scheduled commencement of work.
b.Written certification from the manufacturer regarding the applicator’s qualifications and references for a minimum of three membrane projects completed by the applicator within the last 5 years, provided a minimum of 7 calendar day s prior to the application of any system component. The certification shall apply only to the named individuals performing the application.
519.0 4 WEATHE R LIMITATIONS . Membranes shall not be applied in rainy weather or when the
temperature is below 40°F without the authorization of the Engineer.
519.0 5 SURFAC E PREPARATION . The surface of the deck shall have a smooth, fine -textured finish.
All honeycombed areas and surface cavities shall be cleaned and filled with Agency and manufacturer approved patching materials. 5-211 The entire deck shall be abrasive blast -cleaned to ach ieve an anchor profile that is clean and free of laitance, oil, and foreign materials. Prior to blast cleaning , the surface shall be dry and free of sharp protrusions. In addition to these requirements, the deck surface shall meet any additional requireme nts of the manufacturer ’s recommendations.
519.0 6 Constructio N Details .
a.General Requirements . All work performed shall be in accordance with the manufacturer’s recommendations. The entire system shall be applied by an individual ( applicator) certified by the manufacturer. The manufacturer shall have a competent technical representative with necessary equipment to perform the quality control testing at the job site during all phases of preparation and installation. The t echnical representative will be responsible for performing and reporting all quality control testing required during membrane application. The technical representative shall present all quality -control testing equipment to the Engineer to verify calibration dates and demonstrate their competency to perform quality control testing. Quality control testing includes, but is not limited to , measuring and verifying substrate moisture content and temperature, primer adhesion, membrane thickness, membran e pin holes, and membrane adhesion.
b.Material Storage . All components of the membrane system shall be stored in accordance with the material detail sheets.
c.Surface Condition . Prior to application of primer, the concrete deck shall be cured such that the moisture content reaches 6% or less. Except on minor areas of the deck as approved by the Engineer, torching or other forms of rapidly evaporating free moisture from the surface will not be allowed to achieve initial surface conditions. Cracks sho uld be blown out to ensure excess water is not present. The Contractor shall supply a portable electronic surface moisture meter capable of measuring the moisture content percentage of concrete surfaces. Immediately prior to the application of the primer, the deck shall be cleaned using brooms and compressed air that is free of oil. The concrete surfaces shall be inspected and approved by the Engineer and the applicator prior to priming. 5-212 (d) Application of Primer . The air temperature for primer application shall be at least 40˚F and rising. The primer shall consist of one coat covering the entire deck with an overall coverage rate of 200 square feet per gallon or as specified by the manufacturer. The primer shall be applied by brush, roller, or s prayer. The primer shall cure tack -free in accordance with the manufacturer’s recommendations before application of the waterproofing membrane.
e.Membrane Application . The waterproofing membrane shall be applied by equipment approved by the Engineer. The equipment shall be capable of applying the membrane in a uniform manner onto the prepared substrate in accordance with the manufacturer’s recommendations to ensure bond with the primed surface and elimination of air bubbles. In small areas, the membrane shall be hand -welded by torch around drains, joints, and along the curb as directed by the Engineer. The applicator shall be responsible for the protection of adjacent areas. Sheet membrane shall be installed in a shingled pattern so that water is permitt ed to drain to the low areas of the deck without accumulating against seams. Laps shall be staggered at the beginning and ends of rolls, shall overlap the previous roll , and shall be sealed in accordance with the manufacturer’s recommendations. Prior to suspension of work for any reason, all exposed edges shall be heated, troweled, and sealed in accordance with the manufacturer’s recommendations. The Contractor shall repa ir or correct any deficiencies in the membrane system and substrate noted during quality control testing as recommended by the manufacturer’s representative to the satisfaction of the Engineer at no additional cost to the Agency . If the membrane is damaged or de -bonding from the deck surface occurs after application and quality control testing is complete , the membrane shall be patched or repaired in accordance with the manufacturer’s recommendations at no additional cost to the Agency .
519.0 7 PROTECTIO N OF MEMBRANE . Care shall be exercised to prevent damage to the completed
membrane, especially during paving operations. All damaged areas shall be cleaned and patched to the satisfaction of the Engineer. A rubber -tired or rubber -tracked paver shall be used t o place the bottom course of bituminous mix. The temperature of the bituminous concrete pavement to be placed on the membrane shall be as recommended by the membrane manufacturer and approved by the Engineer. 5-213 (a) Membrane Waterproofing, Spray Applied . An aggregate wearing surface shall be adhered to the top membrane coat. Unless otherwise specified, the aggregate shall be broadcast at the rate of 0.25 to 0.50 pounds per square foot to achieve adequate uniform coverage. Where bituminous concrete pavement will be applied to the membrane surface, a tack coat compatible with the membrane system shall be used between the membrane and the bituminous concrete pavement. The surface preparation and tack coat shall be applied per the manufacturer’s recommendations.
b.Membrane Waterproofing, Torch Applied Sheet . No traffic shall be permitted on an exposed membrane surface. The specified bituminous overlay shall be placed on the membrane within three days after application. The Contractor shall maintain a small supply of Portland cement on the project during the time of paving. The cement dust shall be sparingly cast over the membrane surface to reduce tackiness and thereby prevent the paver or truck tires from sticking to the me mbrane and damaging it. The paver operator shall be directed not to ride the curb lines while paving such areas since the screed shoe may damage the polyurethane sealant on the vertical curb face.
519.0 8 PROTECTIO N OF EXPOSE D SURFACES . The Contractor shall exercise care in the application
of the waterproofing materials to prevent surfaces not receiving treatment from being spattered or marred. Particular reference is made to the face of curbs, copings, finished surfaces, substructure exposed surface, and outside faces of the bridge. Any material that spatters on these surfaces shall be removed and the surfaces cleaned to the satisfaction of the Engineer.
519.0 9 METHO D OF MEASUREMENT . The quantity of Membrane Waterproofing, Spray Applied or
Membrane Waterproofing, Torch Applied Sheet to be measured for payment will be the number of square yards of the specified type used in the complete and accepted work. Measurement will be based on the horizontal distance bet ween the face of the curbs and the horizontal length of membrane installed. Any material specified to be lapped up the face of the curb will not be included in the measured quantity. 5-214 519.1 0 BASIS OF PAYMENT . The accepted quantity of Membrane Waterproofing, Spray Applied and Membrane Waterproofing, Torch Applied Sheet will be paid for at the Contract unit price per square yard. Payment will be full compensation for furnishing, transporting, handling, and plac ing the waterproofing system specified, including primer, tack coat, aggregate, mastic, polyurethane membrane sealant, and surface preparation, and for furnishing all materials, labor, tools, equipment, and incidentals necessary to complete the work. Payme nt will be made under: Pay Item Pay Unit
519.10 00 Membrane Waterproofing, Spray Applied ................................ ............... Square Yard
519.20 00 Membrane Waterproofing, Torch Applied Sheet ................................ .....Square Yard
5-215 SECTIO N 522 – LUMBE R AND TIMBER
522.0 1 DESCRIPTION . This work shall consist of detailing, furnishing, fabricating, transporting,
framing, and placing or erecting lumber, structural timber, or structural glued laminated timber , installing hardware , and applying preservative treatment.
522.0 2 MATERIALS . Materials shall meet the requirements of the following subsection s:
Joint Sealer, Hot Poured ................................ ................................ ............................ 707.0 2(a) Coatings for Wood ................................ ................................ ................................ .....708.0 5 Structural Lumber and Timber ................................ ................................ ................... 709.01 Miscellaneous Hardware, Shapes, and Fabricated Materials ................................ .....709.01(h) Nonstructural Lumber ................................ ................................ ................................ 709.02 Structural Glued Laminated Timber ................................ ................................ .......... 709.03 Timber Preservative ................................ ................................ ................................ ...726.01 Waterproofing Pitch ................................ ................................ ................................ ...726.0 3 Galvanizing ................................ ................................ ................................ ................ 726.0 6 Unless otherwise specified, all metal parts and hardware shall be galvanized.
522.0 3 GENERA L FABRICATIO N REQUIREM ENTS . Glued laminated timber furnished under this
section shall be fabricated by an AITC or APA -EWS licensed laminator and shall comply with ANSI/AITC A190.1 . In addition to being a licensed laminator, the fabricator shall have been in continuous operation for at least five years, and shall demonstrate the capability to fabricate the end products specified. Unless otherwise specified, all material shall be fabricated prior to preservative treatment. Dimensions and bolt hol e locations of prefabricated material shall be within a tolerance of 1/16 inch of the details specified.
522.0 4 SUBMITTALS . Unless otherwise specified, as soon as practical after award of the Contract, the
Contractor shall prepare and submit fabrication d rawings for glued laminated timber in accordance with Subsection 105.06 . The Contractor shall prepare and submit construction draw ings for structural timber erection in accordance with Subsection 105.06 . The erection plan shall include methods and sequenc e of structural timber erection, temporary bracing requirements, the equipment to be used for the erection, the necessary computations to indicate the magnitude of stress in the segments during erection and to demonstrate that all of the erection equipment has adequate capacity for the work to be performed, and provisions for all stages of construction, including temporary stoppages. The Contractor shall follow the erection plan as approved .
Referenced in this section
Sections that cite this one
MEMBRANE WATERPROOFING in other states
Get an email when 519 changes
Vermont revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.
Source: Vermont Standard Specifications for Construction, 2024 Edition. Pages 624–628 of 1,380. View official source ↗