MODIFIED BITUMEN

Vapor barrier roof coating provides a watertight seal where a highly elastic seamless membrane is required.

I. General

1.01 Summary

  1. This document outlines the installation process of Lexis roof coatings on modified bitumen roofs. Actual installation requirements may vary and it is the installer's or specifier's responsibility to determine actual project requirements.
  2. This specification may not outline all procedures for preparation and finishing of penetrations, drains, flashings, etc. This work should be outlined separately by the contractor before the work commences and shall be performed observing good trade practices.
  3. All technical data and safety data sheets for each product used are considered part of these specifications.

1.02 Quality Assurance

  1. Project must be pre-approved by Lexis Coatings to be eligible for any warranty.
  2. Installer must be approved by Lexis Coatings and have experience on projects of similar scope and complexity.
  3. Obtain written approval from Lexis Coatings for any deviation in this specification.

1.03 Warranty

  1. Manufacturer's Warranty: Lexis warrants that the supplied material meets or exceeds our published specifications. Manufacturer's standard material warranty document is only issued on pre-approved projects.
  2. Comply with manufacturer's warranty application procedures. A Pre-Job Qualification Form should be submitted and approved prior to job commencement.
  3. Installer's Warranty: All labor warranties should be provided by installer unless additional warranty coverage is requested, approved and purchased for the project.
  4. Warranty Period: 5, 10 and 15 years.

II. Products

2.01 Lexis Modified Bitumen Roof Restoration System

The following modified bitumen roof coating products are available from Lexis Coatings:

PrimeLock Acrylic Primer
Color: Dark Gray
Clean Up: Water
EnergyGuard Butyl Roof Coating
Color: White, Custom
Clean Up: Xylene
Elongation: 900% ±100%
Tensile Strength: 1000 ±100 psi
Solids by Volume: 40%
SeamStitch Butyl Caulk
Color: White
Clean Up: Xylene
Elongation: 500%± 50%
Tensile Strength: 500 ±50 psi
Solids by Volume: 56 ± 3%

2.02 Product Substitutions

2.03 Related Materials

  1. Roof accessories, flashing, seam tapes and similar materials shall be approved by the roof system manufacturer. All materials used shall be applied in accordance with its manufacturer's recommendations.

2.04 Delivery, Storage and Handling

  1. Delivery: Materials should arrive at the site in manufacturer's original, unopened, undamaged containers with identification labels intact.
  2. Storage: Store all materials at temperatures between 55°F - 90°F (12.7°C - 32.2°C) with careful handling to prevent damage. Do not store at high temperatures in direct sunlight. Protect from exposure to harmful environmental conditions.
  3. Protection: Protect all materials from freezing and other damage during transit, handling, storage and installation.

2.05 Equipment

  1. Read product data sheets for recommended application equipment or consult the equipment manufacturer directly.

III. Execution

3.01 Project and Site Conditions

  1. Substrate should be structurally sound.
  2. Product coverage rates may vary due to application method, surface texture, substrate absorption, wind conditions while spraying and/or other variables.
  3. A moisture survey or other assessments may be needed to determine the presence of wet insulation under existing roofing material.
  4. No application of materials are permitted if inclement weather, precipitation, freezing temperatures are expected within 24 hours or if the following conditions are present:
  Water-Based Solvent-Based
Ambient Air Temperature <55°F (10°C) or >100°F (37.8°C) <45°F (7.2°C) or >95°F (35.0°C)
Substrate Temperature <45°F (7.2°C) or >130°F (54.4°C) <35°F (1.6°C) or >120°F (48.8°C)
Humidity: >85% (high humidity will extend dry time.) > 85% (low humidity may retard cure time.)

3.02 Examination

  1. Verify conditions are acceptable for application of modified bitumen roof restoration system.
  2. Inspect modified bitumen roof to receive roof coating and make sure they are clean, sound, properly prepared and free of moisture, dirt, debris or other contaminants.
  3. A comprehensive moisture survey is to be conducted to locate and identify areas of trapped moisture and saturated insulation.
  4. Verify that all on-roof items, penetrations, mechanical equipment, HVAC drains are in place and secure. All air conditioning and air intake vents should be suitably protected or closed.
  5. Verify that areas within the vicinity of the application area as protected from overspray.
  6. Verify that all roof drains, gutters, downspouts, catch basins are clean and in working order.

3.03 Preparation

  1. Cleaning: The entire modified bitumen roof surface must be clean, sound, dry and free of any contaminants that would interfere with the proper adhesion of the roof coating. This may require pressure washing, scraping, wire brushing or other means necessary while observing responsible trade practices. All loose paint and oxidation should be removed before applying any product.
  2. Ponding Water: Contractor shall make every effort to mechanically eliminate all ponding water areas on the modified bitumen roof prior to application of any roof coating product.
  3. Repairs: Wet roof insulation and damaged membranes are to be removed and replaced as necessary to match existing specified material. All ponds that hold water over 1" for more than 48 hours should be mechanically diverted.
  4. Do not apply coatings until all unsatisfactory conditions have been corrected in a manner acceptable to the original modified bitumen roofing manufacturer.

3.04 Application

  1. Inspect modified bitumen roof to receive roof coating. Always perform a coating adhesion test before doing the entire job.
  2. Seams: All seams, penetrations and parapet walls should be flashed by applying EnergyGuard Butyl Coating over the seam and rolling out 6" SeamStitch Roofing Fabric on center. Immediately saturate fabric by applying another coat of EnergyGuard Butyl Coating and feathering it at least 2" to 3" past the edge of the fabric.
  3. Cracks & Splits: Repair all cracks and splits using the same method as seam preparation above. If cracks and splits are all over the modified bitumen roof, a fully reinforced system will be required.
  4. Blisters: All blisters must be cut out and inspected for moisture content. Cut area must be thoroughly dry before applying any roof coating. Use the same repair procedure for seams.
  5. Base Coat: Apply EnergyGuard Butyl Coating using the application rates specified below. Allow to dry thoroughly for 8 - 12 hours depending on humidity and temperature.
  6. Top Coat: Apply EnergyGuard Butyl Coating using the application rates specified below. Allow to dry and cure before exposing to foot traffic.
  7. Parapet Walls: All seams and joints must be sealed with SeamStitch Polyester Fabric and EnergyGuard Butyl Coating. Coating may need to be applied in multiple coats to avoid running or sagging.
  8. Controlling Application Rates: Divide the roof into 100SF sections then monitor coating usage and adjust application technique to maintain consistency. A coating spreader or airless sprayer with a built in flow meter is recommended. Verify application thickness at 100 - 200SF interval with a wet mil gauge.

3.05 Application Rates

Substrate Primer Base Coat Finish Coat
Smooth
30 dry mils
PrimeLock Acrylic Primer
0.75gal/100SF
EnergyGuard Butyl Roof Coating
2.34gal/100SF
EnergyGuard Butyl Roof Coating
2.34gal/100SF
Granulated
30 dry mils
PrimeLock Acrylic Primer
0.75gal/100SF
EnergyGuard Butyl Roof Coating
3.13gal/100SF
EnergyGuard Butyl Roof Coating
2.34gal/100SF

3.06 Care and Maintenance

  1. Reflectivity of coatings may be reduced if roof surface is not cleaned regularly.
  2. Follow our care and maintenance guidelines.

3.07 Protection

  1. Roof coatings are not traffic grade. Areas surrounding roof top equipment may be reinforced by embedding SeamStitch Polyester Roofing Fabric and applying a thicker membrane (40 - 50 mils). Walk pads should be used if frequent maintenance traffic is expected.
  2. Control overspray especially during windy conditions. Surfaces not to be coated shall be protected during the application of the system. If protection is not feasible, surfaces shall be restored to their proper condition by cleaning, repairing or replacing.
  3. All parking areas adjacent to (within 75 feet ) the work area are to be cleared and roped off.
  4. Protect work from damage due to subsequent construction activity on the site.

csi This product data sheet conforms to the editorial style prescribed by The Construction Specifications Institute.
The manufacturer is responsible for technical accuracy.