SECTION 07130

BENTONITE WATERPROOFING

PART 1 GENERAL

SECTION INCLUDES

Bentonite clay waterproofing in panel form.

RELATED SECTIONS

Section 02223 - Backfilling.

[Section [_____-__________]:	Concrete formwork substrate for attaching bentonite clay panels.]

Section [______-____________]: Concrete foundation substrate.

[Section [______-____________]: Concrete mud slab.]

Section 07212 - Board Insulation: Rigid insulation protective cover.

****** [OR] ******

Section [______-____________]:	[________] cover.

REFERENCES

SYSTEM DESCRIPTION

Waterproofing System: Capable of resisting water head of [____] feet ([____] mm) and preventing moisture from migrating to interior.

SUBMITTALS

Submit under provisions of Section [01300.] [________.]

Shop Drawings: Indicate required flashings, [control] [and] [expansion] joints, sealing at [openings,] [projections,] [reglets,] [sealants,] [and] waterproofing of [holes,] [slots,] [sleeves,] [and] [________].

Product Data: Provide product criteria, characteristics, accessories, jointing and seaming methods, and termination conditions.

Manufacturer's Installation Instructions: Indicate special preparation of substrate, panel attachment methods, and perimeter conditions requiring special attention.

Manufacturer's Certificate: Certify that [Products] [________] meet or exceed [specified requirements]

[________].

QUALIFICATIONS

Installer: Company specializing in performing the work of this section [with minimum [__________] years [documented] experience] [approved by manufacturer].

MOCKUP

Provide mockup of waterproofing system under provisions of Section [01400.] [________.]

Mockup: [100] [____] sq ft ([10] [____] sq m) of [horizontal] [and] [vertical] waterproofed panel; to represent finished work including internal and external corners, sealing, counter flashings, [control] [and] [expansion] joints, [protective cover].

Mockup may [not] remain as part of the Work.

DELIVERY, STORAGE, AND HANDLING

Deliver, store, protect and handle products to site under provisions of Section [01600.] [________.]

Maintain bentonite products dry.	Protect with waterproof cover.

Maintain minimum ambient storage temperatures of [40] [____] degrees F ([5] [____] degrees C) for bentonite gel products.

ENVIRONMENTAL REQUIREMENTS

Maintain ambient temperatures above [40] [____] degrees F ([5] [____] degrees C) for [24] [____] hours before and during application.

WARRANTY

Provide [five] [____] year warranty under provisions of Section [01700.] [________.]

Warranty: Include coverage for waterproofing failing to resist penetration of water.

[For warranty repair work, be responsible for removing and replacing materials concealing waterproofing.]

PART 2 PRODUCTS

MANUFACTURERS

[__________________________________] Product [_________].

[__________________________________] Product [_________].

[__________________________________] Product [_________].

Substitutions: Under provisions of Section [01600.] [________.]

MATERIALS

Bentonite: Granulated pure, dry, self expanding, bentonite clay; comprised of 90 percent minimum sodium montmorillonite; 90 percent minimum passing No.20 (850 micro m) mesh sieve and 10 percent maximum passing No.200 (75 micro m) mesh sieve.

PANELS

Single Panels: Single corrugated core, smooth faced Kraft paper panels, core filled with self expanding bentonite clay granules:

Nominal Panel Size:	[48 x 48 x 3/16] [____x____x____] inches ([1200 x 1200 x 5] [____x____x____] mm).

Minimum Bentonite Fill: 1 lb/sq ft (5 kg/sq m).

Minimum Panel Weight:	[18] [____] lbs ([8] [____] kg).

Triple Panels: Triple corrugated core, smooth faced Kraft paper panels, center core filled with self expanding bentonite clay granules, outer layers placed at right angles to core layer:

Nominal Panel Size:	[48 x 48 x 5/8] [____x____x____] inches ([1200 x 1200 x 16] [____x____x____] mm).

Minimum Bentonite Fill: 1 lb/sq ft (5 kg/sq m).

Minimum Panel Weight:	[24] [____] lbs ([11] [____] kg).

Joint Packing: Biodegradable Kraft paper containers filled with bentonite clay granules; 1-1/4 inches (32 mm) square or 2-3/8 inch (60 mm) triangular x 24 inches (600 mm) long.

****** [OR] ******

Joint Packing: Water soluble plastic filled with bentonite clay granules; 2 inch (50 mm) diameter x 24 inches (600 mm) long.

Joint Seal: Moist and hydrated bentonite clay gel using [water and glycol for below freezing application] [and] [water for above freezing application].

ACCESSORIES

Fasteners:	Galvanized nails.

Adhesive: Manufacturer's recommended type.

Polyethylene Sheet: [4] [____] mil ([1] [____] mm) thick.

Flexible Flashings: [____] [inch] [mil] ([____] mm) thick, [butyl] [EDPM [________]; [________] manufactured by [____________].

Protection Board: Rigid insulation specified in Section [07212.] [________.]

****** [OR] ******

Protection Board: Type recommended by manufacturer.

****** [OR] ******

Protection Board: [1/8] [1/4] [1/2] [____] inch ([3] [6] [13] [____] mm) thick [biodegradable hardboard] [polystyrene foam sheet] [asphalt wood fiberboard] [bitumen impregnated glass fiberboard] [________]; [________] manufactured by [____________].

PART 3 EXECUTION

EXAMINATION

Verify substrate surfaces are smooth and durable; free of matter detrimental to application of waterproofing system.

Verify items which penetrate surfaces to receive waterproofing are securely installed.

PREPARATION

Clean and prepare surfaces to receive waterproofing in accordance with manufacturer's instructions.

[Remove concrete fins, projections, and form ties.]

Fill holes, cracks, honeycombs, and voids with bentonite gel seal, minimum [1/8] [____] inch ([3] [____] mm) thick, extending minimum [3] [____] inches ([75] [____] mm) beyond defect.

Seal [construction joints] [through wall projections] with [joint seal] [joint packing].

APPLICATION ON VERTICAL SURFACES

Apply bentonite panels in accordance with manufacturer's instructions.

Apply single bentonite panels with [masonry nails] [adhesive], starting at base of foundation.

Fold and secure panels around corners with corrugations vertical. Secure unfolded panels with corrugations horizontal.

Lap adjoining panels [1-1/2] [____] inches ([38] [____] mm).

Stagger vertical joints at mid-panel on succeeding courses.

Cut panels parallel to corrugations to avoid bentonite loss.

Place joint packing continuous [along junction of wall and footing and] at termination of panels. Secure to prevent movement.

APPLICATION ON HORIZONTAL SURFACES BELOW SLABS AT HYDROSTATIC CONDITIONS

Apply bentonite panels in accordance with manufacturer's instructions.

Place polyethylene sheet over substrate; lap joints [4] [____] inches ([100] [____] mm).

Apply [triple] [single] bentonite panels with joints lapped [1-1/2] [____] inch ([38] [____] mm). Secure laps to prevent displacement. Stagger joints of adjoining panel rows.

Cut panels parallel to corrugations to avoid bentonite loss.

[Do not extend bentonite panels over pile caps or footings supporting slab edges.]

Place temporary protective polyethylene sheet over installed panels.

Trowel joint seal to beads [1] [____] inch ([25] [____] mm) high around penetrations and [1/2] [____] inch ([13] [____] mm) high around chair legs not placed on pads. Cover beads with polyethylene sheet collars, cut to size.

Align bentonite panels with edge of slab, protect with polyethylene sheet except in areas inaccessible after form stripping.

APPLICATION ON HORIZONTAL SURFACES BELOW SLABS AT NON-HYDROSTATIC CONDITIONS

Apply bentonite panels in accordance with manufacturer's instructions.

Place polyethylene sheet over substrate; lap joints [4] [____] inches ([100] [____] mm).

Apply [triple] [single] bentonite panels with adjoining edges abutted. Secure panels to prevent displacement.

Stagger joints of adjoining panel rows.

Cut panels parallel to corrugations to avoid bentonite loss.

[Do not extend bentonite panels over pile caps or footings supporting slab edges.]

Place protective polyethylene sheet over installed panels; lap joints 4 inches (100 mm).

Trowel joint seal to beads 1 inch (25 mm) high around penetrations and 1.2 inch (13 mm) high around chair legs not placed on pads. Cover beads with polyethylene collars, cut to size.

APPLICATION ON CONCRETE HORIZONTAL SURFACES BELOW GRADE

Apply bentonite panels in accordance with manufacturer's instructions.

Apply single bentonite panels with [masonry nails] [adhesive].

Fold and secure panels around corners with corrugations vertical.

Lap adjoining panels [1-1/2] [____] inches ([38] [____] mm).

Stagger vertical joints minimum [16] [____] inches ([400] [____] mm) on succeeding courses.

Cut panels parallel to corrugations to avoid bentonite loss.

Extend panels up vertical surfaces minimum [12] [____] inches ([300] [____] mm) [to overlap vertically applied bentonite panels].

Lay bentonite joint [seal] [packing] continuous along and around vertical protrusions and at abutting walls. Secure to prevent movement.

JOINTS

Apply bentonite packing and sealer at [construction] [control] [________] joints.

PROTECTION OF FINISHED WORK

Protect finished Work under provisions of Section [01500.] [________.]

Do not permit traffic over unprotected or uncovered waterproofing.

Protect installed waterproofing from precipitation or ground water with temporary polyethylene sheeting. When backfilling begins, remove sheeting.

Protect waterproofing from damage by adhering protection board over waterproofing surface. Scribe and cut boards around projections and interruptions.

SCHEDULE

WATERPROOFING SCHEDULE

Foundation Wall:	Single panel waterproofing, one additional panel at internal and external corners.

Subgrade Tunnel:	Triple panel waterproofing on walls and roof; two additional panels at external corners.

END OF SECTION