Metal Roof Restoration Specifications

I. General

1.01 Summary
  1. This document outlines the installation process of Lexis roof coatings on metal 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 Roof Restoration System

PrimeLock Acrylic Primer

EnergyGuard Acrylic Roof Coating

EnergyMax Acrylic Roof Coating

SeamStitch Acrylic Caulk

SeamStitch Fibers

SeamStitch Roofing Fabric

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 metal roof restoration system.
  2. Inspect none 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.
  7. Verify adhesion over existing substrate by performing a coating adhesion test. Areas with oily or silicone residue must be tested for compatibility.
3.03 Preparation
  1. Cleaning: The entire none roof surface must be clean, sound, dry and free of any contaminants that would interfere with the proper adhesion of the metal 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: Any ponding areas will be noticeable during the cleaning process. Contractor shall make every effort to mechanically eliminate all ponding water areas on the metal roof prior to application of any roof coating product. All ponds that hold water over 1″ for more than 48 hours should be mechanically diverted.
  3. Residual Asphalt: Any asphaltic material (mastics, aluminized asphalt) must be scraped to bare substrate as much as possible. Residual asphalt can bleed through the coating and may cause delamination.
  4. Damaged Panels: Repair dented panels to avoid any ponding water. Damaged panels or broken ribs may need to be replaced. New galvanized panels should be cleaned with a mild acid solution or a degreaser to remove post manufacturing surface oils.
  5. Rusted Metal: Use a rust converter such as PrimeLock Rust Primer on heavily rusted areas. Rust converters should only be applied over rusted areas and must be rinsed thoroughly after the conversion process. For mildly rusted areas, use PrimeLock MultiSurface.
  6. Wet Insulation: Wet roof insulation must be removed and replaced as necessary to match existing specified material.
  7. Fasteners: All exposed fasteners must be inspected, tightened or replaced as necessary. All stripped or backed out fasteners must be replaced with oversize fasteners. Seal all screw heads with SeamStitch Acrylic Caulk.
  8. Sealing Horizontal Seams (No Fabric): Horizontal seams may be sealed by applying SeamStitch Acrylic Caulk into the seam with a brush or plastic putty knife. Caulk must form a 0.5″ – 1″ wide, continuous seal within the seam along the entire width of the roof. Fasteners along the seam may need to be loosened to facilitate caulking and then retightened.
  9. Sealing Horizontal Seams (Fabric): Horizontal seams may also be sealed by applying EnergyGuard Acrylic Coating over the seam and rolling out 6″ SeamStitch Fabric on center. Immediately saturate fabric by applying more EnergyGuard Acrylic Coating and feathering it at least 2″ to 3″ past the edge of the fabric. Fabric should lay completely flat following the profile of the roof. Do not stretch fabric as it will have a tendency to pull away at the corners as the coating cures. Do not install fabric over fasteners. Cover any visible fuzz with additional coating.
  10. Vertical Seams: Not all vertical seams require sealing. Vertical seams may be sealed using the same procedure as the horizontal seams. Lexis recommends sealing the horizontal seams first before the verticals. Always seal the entire length of the vertical seam starting from the top.
  11. Do not apply coatings until all unsatisfactory conditions have been corrected in a manner acceptable to the original metal roofing manufacturer.
3.04 Application
    1. Inspect metal roof to receive roof coating. Always perform a coating adhesion test before doing the entire job.
    2. Base Coat: Apply acrylic base coat using the application rates specified below. Allow to dry thoroughly for 8 – 12 hours before applying the finish coat.
    3. Finish Coat: Apply acrylic finish coat using the application rates specified below. Allow to dry and fully cure before exposing to foot traffic.
    4. Parapet Walls: All seams and joints must be sealed following the same instructions specified above. Coating may need to be applied in multiple coats to avoid running or sagging.
    5. 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 Base Coat Finish Coat
    30 dry mils EnergyGuard Aromatic Polyurethane
    1.5g/100SF    		 EnergyGuard Silicone Coating
    1.5g/100SF
    30 dry mils EnergyGuard Aromatic Polyurethane
    1.5g/100SF    		 EnergyMax Silicone Coating
    1.0g/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.