LapLock™ PSU HT Storage & Installation Instructions

Download LapLock™ PSU HT Installation Instructions

Roofnado LapLock PSU HT is a high-temperature, self-adhering underlayment designed as a secondary water barrier for steep slope roofs (2:12 or greater). It is suitable for use under asphalt shingles, composite shingles, metal, concrete and clay tiles, slate, and wood shakes. This guide provides detailed instructions for the proper installation of Roofnado LapLock PSU HT.

Storage:

  • Store in a dry, well-ventilated area.
  • Keep the material in an upright position.
  • Avoid storing in temperatures above 90°F for extended periods.
  • Ensure storage area is free from open flames and other sources of ignition.
  • It is recommended to install Roofnado LapLock PSU HT within 12 months of purchase

Surface Preparation

  • Install directly onto a clean, dry, continuous structural deck.
  • Remove dust, dirt, loose nails, and old roofing materials.
  • Ensure the deck is smooth and free from protrusions.
  • Replace any damaged or rotted surfaces.
  • Suitable substrates include plywood, OSB, FRT plywood, polyisocyanurate foam insulation board, metal (galvalume steel), and gypsum boards (DensDeck® and USG Securock®)
  • Avoid direct contact between metal components and the roof deck
  • Wood plank decking must have minimum ¼” plywood or OSB installed over the top before applying LapLock PSU HT.

Installation Conditions:

  • Install when air and deck surface temperatures are 40°F (5°C) and rising.
  • For temperatures below 40°F (4.4°C) a primer and 3/8” head roofing nails should be used in the overlap area.
  • Store the product at room temperature prior to installation in cold weather.
  • For installations in temperatures above 100°F (38°C), move the product to a shaded area to cool before removing the release liner.

Deck Edge Instructions

  • Roofnado LapLock PSU HT can be installed either under or over the metal drip edge at the Rake or the Eaves. Follow the appropriate code of the authority having jurisdiction and the installation instructions, including all finishing details, provided by the roof covering manufacturer.

Standard Installation Steps for slopes 2:12 or greater
(See Diagram A.)

  • 1. Unrolling and Cutting:
  • Unroll the underlayment and cut into manageable lengths (15-20 feet).
  • Allow the material to relax for 3-5 minutes before installation.
  • 2. Applying to Deck:
  • Start at the eaves, laying the underlayment parallel to the eaves edge, with the lower edge flush with the outside of the primed drip edge.
  • Remove the release liner from the back of the material and apply horizontally to the roof deck.
  • 3. Overlapping:
  • Overlap using a minimum 3 inch horizontal lap and 6 inch vertcal lap.
  • Overlap at least 6 inches where the ends of two rolls meet.
  • Offset end laps a minimum of 3 feet on adjacent courses.
  • Apply valleys starting at the low point and work upward, ensuring to overlap the previous piece by a minimum of 3 inches.
  • 4.Tile and Metal Roof Installation:
  • For tile roofs, ensure proper ventilation and consult local codes.
  • For standard and metal roofs on slopes 2:12 and greater, follow standard installation instructions.
  • 5. Rolling:
  • Roll the entire roof surface after installation using a minimum 40 lb. roller to ensure optimal sealing.

Required modification for slopes ½:12 to less than 2:12 roof pitch.
(See Diagram B.)

  • For slopes ½:12 to less than 2:12, overlap the horizontal laps by 8 - 18 inches
  • Apply a 6-inch-wide bed of ASTM D4586 compliant roof cement at end laps and apply pressure to the entire end of the lap.
  • For temperatures below 40°F (4.4°C) a primer and 3/8” head roofing nails should be used in the overlap area.

Maximum Tile Stacking: Maximum Roof Pitch:
10 Flat or Profiled Tiles 4:12
6 tile stack (4 over 2) 6:12

LapLock™ PSU HT install diagram for slopes 2:12 or greater


Repair

  • Repair holes and removed fasteners with a round patch extending 6 inches beyond the damaged area.
  • Use heavy hand pressure or a roller to ensure proper adhesion of patches.

Precautions & Safety:

  • Cover Roofnado LapLock PSU HT with the final roof covering within 180 days to prevent exposure to sun and weather.
  • Follow all local building codes.
  • Follow OSHA guidelines for fall protection.
  • Do not install final roof coverings over wrinkled or buckled underlayment.
  • Ensure the space under the covered deck area and the attic space is ventilated in accordance with local building codes.
  • Remove release liners from the work area immediately as they can be hazardous if left on the roof deck.
  • Ensure the installation area is free from wet, icy, or dusty conditions to avoid reduced traction.
  • For further details or assistance with installation, please contact Roofnado customer support.