Re Sarnafil G476 Self-Adhered Waterproofing System by byb38912

VIEWS: 72 PAGES: 12

									Sika Sarnafil Inc.
World Class Roofing and Waterproofing



WATERPROOFING TECHNICAL BULLETIN                                             #02-07

Date: April 27, 2007

To:     Sika Sarnafil Waterproofing Applicators
        Sika Sarnafil Sales Staff & Sales Representatives
        Sika Sarnafil Regional Technical Staff
        Sika Sarnafil Customer Service Staff
        Sika Sarnafil Services Staff
        Sika Sarnafil Marketing

From: Waterproofing Technical Department

Re:     Sarnafil G476 Self-Adhered Waterproofing System Installation Instructions




Following are the Sarnafil Self-Adhered Waterproofing System Installation Instructions.
They are divided into four sections. This information supplements the Adhered
Specification and Details. Please read each section carefully.

Section 1 – Required Quality Assurance Procedures

Section 2 – Sarnafil G476 Self-Adhered Membrane Installation
            Procedures

Section 3 – Flashing Installation Instructions

Section 4 – Hot-Air Welding of Lap Areas




                 Sika Sarnafil Inc., 100 Dan Road, Canton, MA 02021
                 Tel.: 1-800-451-2504, Fax: 781-828-5365, www.sikacorp.com
Sika Sarnafil Inc.
World Class Roofing and Waterproofing


Section 1 – Required Quality Assurance Procedures
General

The following quality assurance (QA) procedures are set forth to ensure proper performance of
the Sika Sarnafil adhered waterproofing system. Following these procedures will help ensure a
quality installation. Membrane adhesion and seam integrity are critical system performance
parameters which can minimize the exposure to liability for the Applicator, Sika Sarnafil, and the
building owner. It is the Applicator’s responsibility to ensure the quality of the installation through
acceptable membrane adhesion and watertightness.

Pre-installation Adhesion Test – On a daily basis the Sika Sarnafil Waterproofing Applicator
(Applicator) shall test adhesion to the substrate ahead of the next day’s work. Each day, on a
properly prepared area of substrate which includes surface conditioner, the Applicator shall
install an adhesion test strip of G476 Self-Adhered membrane approximately 6” - 8” wide by
18” - 24” long in the area of the next days work. Leave 2 - 3” of the membrane unadhered at
either end to grab and pull on the sample. Random areas are to be selected and one test patch
per 2000 sf of substrate to be covered shall be applied for all horizontal waterproofing
substrates. Apply one test patch per 50 linear feet of flashing substrate. The following day, prior
to actual installation, the test patches shall be pulled from the substrate. The tested area is then
cleaned for the actual installation provided that the test results are acceptable.

The adhesion sample must be dated and labeled with a sample number and saved for
inspection by the Sika Sarnafil Technical Representative. All sample locations must be
documented with the sample number, date, and location on a project plan, and labeled as a pre-
installation adhesion test (example – mm/dd/yy Pre #1).

Post-installation Adhesion Test – on a daily basis the applicator shall make test cuts in the
field of the membrane to confirm acceptable adhesion from the previous day’s work. Membrane
adhesion samples approximately 6” - 8” wide by 18” - 24” long shall be cut and pulled from the
substrate. The Applicator shall take 1 adhesion sample per 2000 sf at random locations. A new
piece of Self Adhered G476 shall be installed to infill the sample location. The infill piece shall
be no smaller than 1/4” in width and length than the piece that was removed, nor any larger, i.e.
do not overlap foam backing from the infill piece onto the field sheet. A patch of Sarnafil
bareback membrane that is at least 3” larger than the sample area must be installed over the
infill piece.

The adhesion sample must be dated and labeled with a sample number and saved for
inspection by the Sika Sarnafil Technical Representative. The patch shall be labeled with
permanent marker to show the same date and sample number. Mark the date and location on
the project plan and label it as a post installation adhesion test (example – mm/dd/yy Post #1).
Sika Sarnafil Inc.
World Class Roofing and Waterproofing

Acceptable Adhesion Criteria – Adhesion shall be considered acceptable when the cohesive
failure of the foam backing or concrete occurs over at least 75% of the sample, i.e., 75% of the
foam tears from the membrane and remains on the substrate, or the foam is covered with a thin
layer of concrete over 75% of its surface, when the sample is removed.

If the result of either the pre-installation or post-installation adhesion test is unacceptable, no
further installation shall take place until acceptable adhesion can be demonstrated and
maintained. Unacceptable adhesion may be due to one or more of the following factors:
1) substrate preparation/condition, 2) surface conditioner application, 3) the self-adhered
membrane installation method, including proper rolling-in of the membrane. Contact the Sarnafil
Regional Technical Department for assistance.

The contractor shall identify the extent of the area with unacceptable adhesion through
additional test samples taken in all directions adjacent to the original failure point. All areas of
unacceptable adhesion shall be removed. The preparation process and pre-installation
adhesion test is to be repeated. Once acceptable adhesion can be demonstrated, the
membrane shall be replaced. Repair of areas with unacceptable adhesion shall be made by the
applicator at no cost to the owner.

Several factors can affect adhesion such as moisture, dust, temperature, humidity, concrete
additives, and substrate smoothness. The substrate must be clean, smooth, and dry. The
minimum substrate, ambient, and membrane temperature is 40° F (4.4° C) and rising. Surface
conditioner must be applied at a rate of 800 – 1000 sf/gal. (20 - 25 m2/liter) immediately
preceding membrane installation and allowed to dry completely. If any substrate is not covered
by membrane the same day that the surface conditioner was applied, the surface preparation
and surface conditioner application must be repeated immediately prior to membrane
application.

Seam Samples – A minimum of 3 seam test samples, each at least 1 inch wide, must be taken
on a daily basis by the Applicator. Samples should be taken at the start of each days welding,
late morning, and immediately after lunch break.

    1. The sample is taken by cutting a cross-section of the seam approximately one-inch wide.
       Make the cut across the seam about 6 inches long centered over the edge of the weld
       and remove the sample.

    2. Using Vice-Grips or pliers, pull the seam apart. The seam is considered acceptable when
       the top membrane separates within itself. Hand welded seams should be a minimum of ¾
       in. wide and machine welded seams should be a minimum of 1 in. wide.

    3. Repair the sample area by hot-air welding a patch that is at least 3 inches larger than the
       opening in all directions.
Sika Sarnafil Inc.
World Class Roofing and Waterproofing

    4. The seam sample must be dated and labeled with a sample number and saved for
       inspection by the Sika Sarnafil Technical Representative. The patch shall be labeled with
       permanent marker to show the same date and sample number. Mark the date and
       location on the project plan and label it as a seam sample (example – mm/dd/yy seam
       #1).

Seam Probing – The Applicator is responsible for probing of all hot-air welds including seams,
patches, and details.

After the membrane has cooled from hot-air welding, check the seams for continuity using a
rounded flat head screwdriver or other acceptable tool (seam probe). Press the edge of the
screwdriver firmly into the seam area while moving it along the seam. Mark areas where the probe
can penetrate the seam for repair and or patching.




                                        End of Section
Sika Sarnafil Inc.
World Class Roofing and Waterproofing


Section 2 – G476 Self-Adhered Membrane Installation Procedures

General

    1. Prior to installation, the applicator must read and understand the G476 Self-Adhered
       Membrane – Required Quality Assurance Procedures, and follow them throughout the
       project.

    2. Apply G476 SA membrane to only clean, smooth, dry substrates when both substrate
       and ambient temperatures are 40° F (5° C) , and rising, or higher.

    3. The basic application technique is shown in this document. Variations of the installation
       technique may exist. Review other techniques with Sika Sarnafil prior to starting the
       project.

    4. Consult Sika Sarnafil Specifications, Details, and Product Data Sheets for additional
       information.

Surface Conditioner 150

    1. Use Surface Conditioner 150 as received. Do not dilute.

    2. Surface Conditioner 150 must be applied to all horizontal and vertical concrete and
       masonry substrates.

    3. The substrate must be free of laitance, dirt, dust, debris, oils and other contaminants.
       Spalled or damaged concrete must be repaired prior to coating.

    4. Apply surface conditioner evenly to a clean, dry, frost-free substrate using a standard
       pump/air sprayer with a fan or cone tip nozzle at a rate of 800-1000 ft2/gallon (20 -25
       m2/liter). Surface Conditioner 150 may also be roller applied if spraying is not practical.
       Use a heavy nap roller cover and spread conditioner evenly over the substrate.
       Note: The coverage rate will be reduced considerably when this method is used.

    5. Do not apply surface conditioner during periods of inclement weather or when ambient
       or substrate temperatures are below 25° F (-4° C). Temperature must be 25° F (-4° C)
       and rising for surface conditioner application.

    6. Allow surface conditioner to dry one hour or until dry to the touch. Surface conditioner
       must dry completely prior to the installation of the membrane. Dry time will vary
       depending on temperature and humidity. Remove all heavy or puddled areas to ensure
       thorough drying.
Sika Sarnafil Inc.
World Class Roofing and Waterproofing



    7. Reapply surface conditioner if rain occurs prior to application of membrane or if
       substrate becomes dusty.

    8. Apply only as much surface conditioner as can be covered with membrane on the same
       day. Surface conditioner must be reapplied to previous applications if not covered the
       same day with membrane.


G476 Self-Adhered Membrane

    1. Unroll approximately 6 - 8 feet (1.8 m - 2.4 m). Use the unrolled portion of the sheet to
       align and position the G476 SA membrane on the substrate. For subsequent sheets,
       overlap the adjacent sheet with the selvedge. (Photo A) Be certain to tightly butt the
       foam backing of adjoining sheets. Check under the selvedge along the 6 - 8 feet (1.8 m -
       2.4 m) of overlap for foam to foam contact and correct alignment. (Photo B) The foam
       backing should not overlap onto the adjacent membrane, nor should there be a gap
       between the foam backing of adjacent sheets. If either of these conditions exist,
       reposition the sheet to properly butt the two foam backings.




      Photo A                                        Photo B
Sika Sarnafil Inc.
World Class Roofing and Waterproofing

    2. Once the sheet is properly aligned, pull back the 6 - 8 feet (1.8 m - 2.4 m) of the unrolled
       portion of the membrane back over the roll to expose the underside. Carefully cut the
       release liner across the width of the roll and remove it from the foam backing. (Photos C
       & D) Insure that the sheet remains properly aligned.




      Photo C                                         Photo D

    3. Place the membrane with the release liner removed onto the substrate using care not to
       disrupt the alignment. (Photo E) Roll the 6 - 8 feet (1.8 m - 2.4 m) of adhered membrane
       immediately into place.

    4. Pull the roll back onto the adhered portion of the sheet until the end of the release liner is
       visible and accessible. (Photo F)




     Photo E                                           Photo F
Sika Sarnafil Inc.
World Class Roofing and Waterproofing

    5. Begin to slowly remove the release liner in the direction of the membrane application as
       the remainder of the sheet is carefully unrolled. (Photo G)

    6. Roll the membrane completely with a suitable weighted foam covered roller to assure
       bond to the substrate. (Photo H)

    7. Repeats steps 1 - 6 above for additional sheets.




     Photo G                                            Photo H


    8. Use a min. 8 inch (20.3 cm) wide cover strip where membranes meet at end laps and all
       non-selvedge edges. Butt adjoining sheets closely, center the cover strip over both
       membranes and hot-air weld. Do not overlap foam backing onto membrane.

    9. Hot-air weld all membrane overlaps according to Sika Sarnafil specifications and
       instructions.

    10. Complete all flashing according to Sika Sarnafil specifications, flashing installation
        instructions, and details.




                                        End of Section
Sika Sarnafil Inc.
World Class Roofing and Waterproofing


Section 3 – Flashing Installation Instructions


Flashing Installation Using G476 Self-Adhered Membrane


    1. Apply surface conditioner to all concrete and masonry surfaces prior to membrane
       application. Allow surface conditioner or adhesive to dry completely prior to installing the
       membrane.

    2. Notes:

            a. Drying time increases with cooler temperatures and on days of high humidity
               because of slow evaporation of the water.

            b. The Applicator shall count the amount of pails of surface conditioner used per
               area, per day, to verify conformance to the specified coverage rate.

    3. G476 SA membrane field sheet should be applied continuously from the horizontal to the
       vertical flashing substrate wherever possible. Work the membrane into corners as tightly
       as possible to minimize bridging. Folding the membrane and then applying pressure to
       form a crease can help to contour the membrane into the corner.

    4. Cut flashing membrane to a workable length. Adjacent sheets of self-adhesive
       membrane must be overlapped using the selvedge, or non-selvedge sheets are butted
       closely. Never overlap the foam backing with pressure sensitive adhesive onto the top of
       the adjacent membrane. Press the bonded membrane firmly into place with a hand
       roller.

    5. Hot-air weld all membrane overlaps. Use a min. 8 inch (20.3 cm) wide cover strip where
       flashing membranes meet at end laps, butt joints, and all non-selvedge edges. Butt
       adjoining sheets closely, center the cover strip over both membranes and hot-air weld.
       Complete inside and outside corner flashing details with prefabricated corner patches
       (Sarnacorners - Universal).
Sika Sarnafil Inc.
World Class Roofing and Waterproofing

Flashing Installation Using Standard Bareback Membrane and Sarnacol 2170 Adhesive

    1. Using a solvent-resistant paint roller, apply the adhesive to the properly prepared
       substrate. Apply the adhesive at a rate of approximately 1-1/2 to 2-1/2 gallons per 100
       square feet (0.61 - 1.02 liters/sq. m) of surface depending upon the substrate. Consult
       Product Data Sheet for exact application rate. Apply the adhesive in a smooth, even
       coating with no holidays, globs, puddles or similar irregularities. Coat only an area which
       can be completely covered with flashing membrane in the same day’s operation. Allow
       the adhesive to dry completely before proceeding to the next step.

    2. Drying time increases with cooler temperatures and on days of high humidity because of
       slow evaporation of the solvent.

    3. When the adhesive on the substrate is dry, coat the underside of the flashing membrane
       with adhesive at a rate of 1/2 gallon per 100 sq. ft. (0.2 liter/sq. m). When the adhesive
       has dried sufficiently to produce strings when touched with a dry finger, the coated
       membrane shall be rolled onto the previously-coated substrate being careful to avoid
       wrinkles. Do not allow adhesive on the underside of the membrane to completely dry.
       Do not apply adhesive in the seam area.

    4. The amount of membrane that can be coated with adhesive before applying to the
       substrate will be determined by ambient temperature, humidity, and manpower. Overlap
       the adjacent flashing sheet a minimum of 4 inches (10.2 cm). Extend the flashing
       membrane a minimum of 5 inches (12.7 cm) on to the field sheet. Press the bonded
       membrane firmly into place with a hand roller.

    5. Count the number of pails of adhesive used per area per day to verify conformance to
       the specified adhesive rate.




                                        End of Section
Sika Sarnafil Inc.
World Class Roofing and Waterproofing


Section 4 – Hot-Air Welding of Lap Areas

General

    1. Overlaps shall be with the flow of water where possible.

    2. All workers intending to perform the installation shall be trained and qualified, and shall
       have successfully completed a waterproofing course of instruction provided by Sika
       Sarnafil prior to welding.

    3. All surfaces to be welded shall be clean and dry. No adhesive shall be present within lap
       areas.

    4. Visible evidence that welding is proceeding acceptably is smoke during the welding
       operation, shiny membrane surfaces, and an uninterrupted flow of black material (“bleed
       out”) from the edge of completed joints.

Setting the Welding Temperature

    1. Hand welded seams shall be completed in two stages. Equipment shall be allowed to
       warm up for at least one minute prior to start of welding.

    2. Attain correct welding temperature by holding the nozzle approximately one inch from
       the membrane surface for 5 seconds (use the back side of the membrane or a piece of
       scrap). Move the nozzle away and quickly run your finger over the heated membrane
       surface (Caution: The membrane will be very hot. Do not leave your finger in contact
       with the membrane for more than 1 second). If the membrane surface is soft and
       “smears” slightly the welding temperature is correct. If the membrane begins to burn
       prior to 5 seconds of applied heat, the welding temperature is too hot. If the membrane
       cannot be smeared, the welding temperature is not hot enough.

    3. Adjust welding temperature until satisfactory results are obtained. Allow at least one
       minute after adjusting temperature prior to testing.

    4. This simple test is important and it allows accurate temperature adjustment which
       eliminates variations in the tool, electrical current, and ambient temperature. The test
       should be conducted at the start of the welding process and repeated as often as
       conditions change.
Sika Sarnafil Inc.
World Class Roofing and Waterproofing

Hand Welding

        1. Hand welded seams shall be completed in three stages. Equipment shall be allowed
           to warm up for at least one minute prior to start of welding.

        2. The lap may be tack welded as needed to hold the seam in place.

        3. Pre-weld - the back edge of the lap shall be welded with a thin, continuous weld to
           prevent loss of hot air during the final welding.

        4. Final Weld – the nozzle shall be inserted into the seam at a 45 degree angle to the
           edge of the membrane. The top corner of the nozzle must remain visible at all times
           during the final weld process. Once the proper welding temperature has been
           reached and the membrane begins to "flow," the hand roller is positioned
           perpendicular to, and 1 inch away from the nozzle and pressed lightly at it is rolled
           over the heated part of the seam. Both tools are moved simultaneously down the
           seam as the weld progresses. For straight seams, the 1½ inch (40 mm) wide nozzle
           is recommended for use. For corners and compound connections, the ¾ inch (20
           mm) wide nozzle shall be used.

Machine Welding

        1. Machine welded seams are achieved by the use of Sika Sarnafil's automatic welding
           machine, the Sarnamatic. When using the Sarnamatic, Sika Sarnafil's instructions
           shall be followed and local codes for electric supply, grounding and over current
           protection observed. Dedicated circuit house power or a dedicated portable
           generator is recommended. No other equipment shall be operated off the generator.




                                        End of Section

								
To top