Liquid Applied Membranes

Liquid Applied Membranes (LAM) is a waterproofing, UV-resistant coating that protects against weathering, impact damage, stress cracking and ultraviolet rays. This roofing system is applied at varying rates of thickness and is mostly used over existing metal roofs, single ply or modified bitumen roofs as an alternative to tearing off and replacing the existing system. There are many application methods ranging from roller to broom. LAM is a tenacious adhesive and is coal and tar free.

The Process
The existing metal roof is prepared and power washed to ensure a clean, rust-free surface.  Next all fasteners are checked, tightened and replaced if necessary with oversized fasteners. Then all the fasteners are encapsulated with an elastomeric sealer.

All the seams in the roof are sealed with an elastomeric sealer and the horizontal seams receive a polyester reinforcement and an additional layer of elastomeric sealer.

All the penetrations are also sealed with a double layer of elastomeric sealer and polyester reinforcement.

With the roof, lap and penetration preparation work done, the roof is then ready for the two coat, rubber based coating. A base coat is first applied then the finish coat is sprayed on at the rate of 2 gallons per square, per coat (10 yr warranty on material, 5 year warranty on labor), or 3 gallons per square, per coat (10 year warranty on material, 10 year warranty on labor).

Advantages of LAM Membranes

  • Significant savings over roof replacement
  • Highly reflective white or aluminum finish membranes which can save up to 40% on cooling costs
  • Lightweight design adds minimal load to the structure
  • No interruption in building operation in the event of unexpected rainfall during construction
  • Long term warranties