SECTION 680 — WATERPROOFING
680.1 DESCRIPTION —
This work is the application of two-coat painted waterproofing, membrane waterproofing, or fiberglass-membrane waterproofing, as indicated, to cement concrete structures.
(a) Bituminous Material.
One of the following, as specified in Section 702:
Cut-back Asphalt Primer, Class WP-1 or Emulsified Asphalt, Class E-8 as an alternate.
Asphalt Cement, Class WA-1
Asphalt Cement, Class WM-1
Asphalt Cement, Class J-1
(b) Waterproofing Fabric.
AASHTO-M117 or ASTM-D173. Certify as specified in Section 106.03(b)3.
(c) Fiberglass Fabric.
ASTM-D1668, Asphalt type. Certify as specified in Section 106.03(b)3.
680.3 CONSTRUCTION —
Do not apply waterproofing in wet weather or when the air temperature is below 50F.
Where applicable, spray equipment may be used, if permitted.
Satisfactorily dry and clean the surfaces to be waterproofed.
Apply one coat of primer of the required type to surfaces of concrete or steel that are to be in contact with waterproofing.
For each paint coat or mop coat, use 4 1/2 gallons of bitumen for each 100 square feet of surface. When heating bitumen, stir frequently. Equip heating kettles with armored thermometers. Work the primer in satisfactorily, to give a uniform coating, then dry at least 24 hours before applying first paint or mop coat.
Fill grooves, as directed, with Asphalt Cement, Class J-1, before or after applying primers and waterproofing. Fill expansion joints, as directed, with Asphalt Cement, Class J-1, before applying primers and waterproofing. Dry and clean joints before they are filled. Overfill slightly to allow for shrinkage.
Use care to prevent damage to the waterproofing caused by construction operations. Lay wood planks, plywood, or suitable sheet material over the waterproofing when trucking or tracking is unavoidable. Repair damage, as directed.
(b) Two Coat, Painted Waterproofing.
Apply one coat of cold Cut-back
Asphalt Primer, WP-1, and two coats of hot Asphalt Cement, Class WA-1.
Apply one coat of cold Cutback Asphalt Primer, Class WP-1, three hot mop coats of Asphalt Cement, Class WM-1, and two layers of asphalt type waterproofing fabric.
Apply the primer; allow it to dry the specified time. Apply a mop coat 2 inches wider than one-half the width of the fabric to be laid. Lay a one-half width strip of fabric on this mop coat and press it into place. Mop the top surface of this fabric and an adjacent section of the surface, 2-inches wider than one-half the fabric width. On this mopping, lay a full width of fabric and press it into place, completely covering the first strip. Then lay full-width strips of fabric in hot moppings, pressing each strip into place so each strip laps the preceding strip by 2 inches. Completely cover and seal the fabric with each mopping. Use fabric side laps not less than 2 inches wide and end laps not less than 12 inches wide. Give the entire surface a final mop coat that completely seals the weave of the fabric.
Firmly bond the completed waterproofing. Do not place one layer of fabric directly on another layer or surface at any point not covered with a mop coat.
Take special care to seal laps. At the edges of the waterproofing and at places where it is punctured by openings such as drains or pipes, prevent water from getting between the waterproofing and the waterproofed surface.
Do not break the waterproofing at expansion joints; instead, fold each ply of fabric 3 inches, doubled over the joint, and pressed down in order to allow for a small amount of movement.
For flashing against girders, curbs, and spandrels, place single sheets of fabric on a primer, then cover with a mop coat. Overlap edges of the other waterproofing at least 12 inches. Embed the upper edges of the flashing, placed on concrete surfaces in grooves, then seal with Asphalt Cement, Class J-l.
Where required, place fabric, free from punctures, pockets or folds, and turn without break into drainage castings. Take special care to make the waterproofing effective along the sides and ends of the girders and at stiffeners or gussets.
As directed, use an extra layer of fabric to reinforce waterproofing applied to surfaces with change abruptly in direction.
On vertical or approximately vertical surfaces, lay the strips of fabric vertical or with the slope, overlapping each adjacent strip as specified; on other surfaces, lay the strips shingle fashion, beginning at the lowest elevation of the surface to be waterproofed. Allow sufficient fabric for a suitable lap or anchor at the upper edge of the surface to be waterproofed.
Regulate the work so fabric laid at the end of the day has received the final coat of bitumen.
Do not patch, unless permitted. Where patching is permitted, extend the patch at least 12 inches beyond the outermost edge of the damaged portion. Extend the second, and each succeeding, ply of the patch at least 3 inches beyond the preceding ply.
(d) Fiberglass-Membrane Waterproofing.
Apply one coat of cold Cut-back Asphalt Primer, Class WP-1, four hot mop coats of Asphalt Cement, Class WM1, and three layers of asphalt type fiberglass fabric.
Apply as specified in Section 680.3(c).
680.4 MEASUREMENT AND PAYMENT —
(a) Two-Coat Painted Waterproofing.
Incidental to the class of cement concrete to which it is applied and no separate or additional compensation will be allowed.
(b) Membrane Waterproofing.
(c) Fiberglass-Membrane Waterproofing.
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