Abstract
Metal roof decks in long-span light steel structures can become damaged and obsolete by corrosion should the roofing system become compromised. Re-roofing is conducted by either removing and replacing damaged areas (resulting in suspension of interior operations and lost revenue) or installing new decking directly over the damaged areas which can transfer corrosion to the new deck. This research conducts structural and durability analyses on a novel proposed re-roofing concept that installs a new metal roof deck over the existing deck by using a proprietary deck strap resulting in no interruption of interior processes. Preliminary structural analysis shows the proposed concept to be applicable to generic conditions around Southern Ontario. Recommendations for project specific structural analysis are made. Durability analysis demonstrates that the proposed concept system improves hygrothermal performance of the roof assembly in all cases except when insulation in the existing roof assembly is saturated. Saturated insulation should be removed prior to installing the re-roofing system.
Highlights
The use of steel roof decks on flat or low-slope roofing typically found in warehouse and long-span light steel structures is intended to perform four primary functions: (i) load distribution, (ii) lateral support, (iii) roof assembly support and (iv) provide fire protection for the roof assembly
This paper focuses on a novel concept to install a new metal deck and roof assembly above existing areas of deteriorated metal decking with little or no inter
The process comprises a plurality of deck straps used to structurally bridge the new roof deck/assembly to the top of the main open-web steel joist system typically found in the warehouse building typology
Summary
The use of steel roof decks on flat or low-slope roofing typically found in warehouse and long-span light steel structures is intended to perform four primary functions: (i) load distribution, (ii) lateral support (structural diaphragm), (iii) roof assembly support (membrane, insulation, etc.) and (iv) provide fire protection for the roof assembly. The process comprises a plurality of deck straps used to structurally bridge the new roof deck/assembly to the top of the main open-web steel joist system typically found in the warehouse building typology. Installation Method 1 involves the complete removal of the existing roof system waterproofing and insulation layers leaving only the existing metal roof deck. Installation Method 2 involves a partial removal of the existing roof system waterproofing and insulation layers along the open web steel joists, leaving the majority of the existing roof assembly undisturbed. In both methods, deck straps are fastened to the existing roof deck at existing open web steel joists. This paper presents the results of structural and durability (hygrothermal) analyses to evaluate various aspects of performance of the re-roofing system, including structural behaviour under various load conditions and the system’s ability to manage moisture both from the exterior and residual from the original failed assemblies
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