Retrofit

LIFE EXTENDING RETROFIT SYSTEMS

RETROFIT / REROOFING Loadmaster – Lightweight Insulating Concrete – Poured Gypsum – Conventional Steel Decking with Rigid Insulation

All Loadmaster Retrofit Systems have a common performance feature. Using engineered screw attachment patterns, they all combine Loadmaster insulations and Duraflex Roof Cover Boards into a structural composite system where all components act as a single structural unit. This structural composite unit provides life extending properties to new bituminous roof coverings by limiting and/or eliminating stresses created in roof coverings. Life shortening stresses are generated by horizontal and vertical wind loadings, temperature loads and variations, moving concentrated gravity loads, unstable wood blocking, seismic forces and building movement. On actual Loadmaster installations, roof covering life has been extended from 50% to 75%. Loadmaster’s 50 year performance record has proven this fact and established a current maximum extension of 21 years on a 15 year specification roof covering – an extension of 140%.

LWIC Loadmaster Retrofit-1

Loadmaster has unique Retrofitting Systems for each of these four roof deck types. Retrofitting conventional steel roof deck assemblies is substantially different than retrofitting structural composite roof deck assemblies. In conventional deck construction, the steel deck panel is the sole structural entity and provides all the structural performance of the assembly. It alone provides gravity load resistance, wind uplift resistance and diaphragm shear resistance for horizontal wind and seismic loads. The steel deck alone must be retrofitted if necessary to maintain structural capabilities.. The rigid insulation attaches directly to the steel panel and contributes only partial wind uplift resistance to the structural performance of the system. In structural composite assemblies, the structural strength is derived from the engineered attachment of all the components in the assembly which creates a single structural unit . This structural composite unit provides gravity load resistance, wind uplift resistance and diaphragm shear resistance for horizontal wind and seismic loads. All the components must be retrofitted in a precise manner to restore or maintain the structural composite strength. This distinct structural difference MUST BE RECOGNIZED AND TREATED CORRECTLY in a retrofit or reroofing operation. If not, the building can be left in a “dangerous” structural condition and subject to collapse under high winds or seismic loads. The following will outline the correct procedure to retrofit / reroof all these systems.

 

Loadmaster Retrofit Systems:

Loadmaster Roof Deck Retrofit System

LWIC Roof Deck Retrofit System

Gypsum Roof Deck Retrofit System

Conventional Steel Decking with Rigid Insulation

The following is an article directly concerning this subject that appeared in the January 2015 issue of RCI’s Interface magazine.

RCI Article 2015 – Retrofitting Structural Composite Roof Decks

Things You Should Know – Before Reroofing Loadmaster Roof Decks (PDF)

Things You Should Know – Reroofing Lightweight Insulating Concrete Roof Decks (PDF)