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Life After Roofing
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This paper discusses the effects of different ageing conditions on the mechanical and physical characteristics of cementitious roofing tiles reinforced with sisal and newsprint pulps, sisal strand fibre and polypropylene (PP) fibre. Roofing tiles with undulate shape were produced by a slurry de-watering and pressing technique. They were subjected to three distinct ageing conditions: fast carbonation, accelerated ageing cycles and fast carbonation plus accelerated ageing cycles. Fast carbonation did not improve the maximum load (ML), the limit of proportionality (LOP), toughness and maximum deflection but did decrease their water absorption, apparent porosity and air permeability; however, after 50 heat and rain accelerated ageing cycles, it was ineffective in maintaining the mechanical properties (ML, LOP, toughness and deflection) of the tiles reinforced with vegetable fibres. The refined sisal pulp fibres led to roofing tiles with slightly higher LOP, toughness and maximum deflection than those reinforced with newsprint pulp fibres. PP fibres significantly improved the mechanical performance (ML, LOP, toughness and deflection) of the roofing tiles in relation to sisal strand fibres. Roofing repair san pedro accelerated ageing cycles were effective in promoting severe degradation on the roofing tiles with sisal strand fibres, while the tiles reinforced with PP fibres were practically unaffected.
This report quantifies energy savings that would accrue through the use of increased roof insulation. Describes low-slope roofing system research which would conserve energy. Adding insulation to uninsulated or poorly insulated low-slope roofs would save as much as 730,000 billion Btu - about 1% of the total annual US energy consumption; while, increasing the service life of low-slope roofs by one year would save approximately 42,000 billion Btu - about 0.06% of the total annual energy consumed. Estimates regarding low-slope roof areas and national energy savings potential from conserving space heating and cooling energy wasted through the low-slope roof areas were developed. In addition, estimates of the relative quantities of different low-slope roofing systems currently in place and trends have been summarized. The significance of the effects of solar radiation on thermal energy losses and gains through roofs were reviewed. Embodied energies of several typical low-slope roofing materials. Systems have been examined and/or estimated. Savings of embodied energy attributable to increasing roof life by one year were estimated together with payback periods for embodied energy used in typical low-slope roofing systems. Estimates have also been developed for variations in the mass of common roofing systems and for a range of more » thermal time lags.
On November 8--9, 1989, a group of concerned roofing professionals gathered in Oak Ridge, Tennessee, to exchange information and to hear discussions on topics dealing with wind's effect on roofs. Several important issues were addressed: (1) Wind-related roofing problems are a concern to the roofing industry; (2) There is no comprehensive understanding in the US roofing industry of the dynamics of wind phenomena; (3) There is inadequate field data on wind's effect of roof performance; (4) The correlation between field performance and laboratory testing is poor; (5) Procedures for laboratory testing and field testing are inadequate for many roof systems; more » (6) There is little roof uplift resistance research underway in the US, and what does exist is poorly coordinated; (7) Manuals, test procedures, standards, and codes for wind uplift are often inadequate, even confusion and contradictory at times; and (8) Building owners are not well enough informed to commit to the cost of wind uplift technology development or even to the design and construction of stronger roofs. These concerns led one group, the Single Ply Roofing Institute (SPRI), to commission a study in 1986 to determine the feasibility of an apparatus for testing whole roof assemblies under conditions that closely simulated real roof wind effects. Results from this study were shared with Oak Ridge National Laboratory (ORNL), which has subsequently submitted a review. A major conclusion from the joint talks with ORNL was the importance of avoiding decisions on an individual uplift testing concept with too narrow a focus on wind-related roofing issues. Subsequently, it was decided to schedule a workshop on the topic with the original sponsors being SPRI, ORNL, and the Naval Civil Engineering Laboratories (NCEL).

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