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ConDeck 101

Roofing Membrane

Light Weight Insulating Concrete (LWIC) is a superior surface for all Singly Ply (TPO, EPDM, PVC, etc.) and Built-Up Roofing (BUR) Membranes. Roof Membrane(s) can be fully adhered, mechanically attached, or loose laid and ballasted. LWIC roof decks provide a heat sink beneath the membrane moderating temperature change. This prolongs the membrane life which leads to fewer repairs and replacements because there is less fatigue, stress, splitting and cracking within the membrane(s).

Light Weight Insulating Concrete (LWIC)

ConDeck provides a variety of LWIC systems to meet any job requirements. LWIC roof decks are far superior to other rigid insulation systems. The monolithic LWIC topping provides a greater base for roof membranes and does not have joint or thermal drift problems associated with other rigid insulation board systems. LWIC is a sustainable roofing insulation that lasts for the life of the building. Only the membrane needs to be replaced when a re-roof is required over a LWIC roof deck. This is considerable in cost savings over the life of the building. LWIC has the ability to fast track a project. LWIC roof decks install fast (less labor intensive), and will essentially dry-in a project allowing interior trades to start even before roofing begins. LWIC has superior wind and fire resistance over other roof insulation materials. High thermal resistance values are easily and economically achieved. LWIC systems have been tested and approved by Underwriters Laboratories, Factory Mutual, and other code authorities. LWIC is the preferred system for Miami-Dade because of high wind uplift resistance.

Lwic Slurry Bond Coat

The LWIC slurry coat bonds the EPS insulation board to the deck. The LWIC slurry fills the flutes of metal deck, and depressions, voids, and joints in other substrates so that air infiltration is eliminated. LWIC roof decks have neither the joint problems nor thermal drift characteristics associated with other rigid board insulation systems. Air in the metal deck flutes is the number one (1) cause of roof membrane uplift failures.

Base Sheet Or Roofing Adhesive

In a BUR, the base sheet is mechanically attached to the LWIC. Singly Ply membranes can be mechanically attached (with approved fasteners and plates) or applied directly to LWIC using manufacturer approved adhesives. Consult the Roofing Manufacturer for their recommended nailing pattern or adhesive for securing the roofing membrane to the LWIC system. Fastener pull out values increase with the age of the LWIC roof deck insuring a tenacious bond throughout the life of the membrane.

Metal Deck Or Approved Substrate

LWIC is approved over a variety of substrates including but not limited to the following: Steel Roof Deck, Pre-Cast or Structural Concrete, Tectum Roof Deck, existing roof membrane(s) or temporary roofs.

Eps Insulation Board

EPS is a low cost high thermal resistance Insulation Board. The LWIC slurry coat bonds the EPS to the deck in new construction or to the existing roof in re-roofing applications. Other rigid insulation systems act like a sponge soaking up moisture, reducing R-value, and have to be replaced over time. This is very expensive, time consuming, and extremely inconvenient in occupied buildings. This is not the case with LWIC roof decks as the EPS Insulation Board is completely encapsulated and protected by the LWIC. EPS is one of the most dimensionally stable roof insulations available. EPS has a permanent LTTR — Long-Term Thermal Resistance. Other rigid board can lose up to 30% of their publisher R-values over time because of thermal drift, thermal bridging (fasteners are a thermal bridge), and board shrinkage.