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RESIDENTIAL // COMMERCIAL // INDUSTRIAL
REGULARS: QUALITY MATTERS
From page 26
Other considerations
Protection of the perimeters of the building is essential due to the increased wind pressure in these zones. This can be accommodated in many ways including:
1. Closing the purlins distances around the perimeter, as highlighted above, increases the amount of fixation and therefore the ability of the roof sheet to remain attached to the main structure.
2. The detail of the eaves / ridge flashing can have a major bearing on how the wind is diverted from impacting on the roof system.
3. Soffit protection such as metal soffit sheeting can deflect the wind from forcing the roof sheet off its clips. If soffits are left exposed the wind, the pressure from the compressed insulation and thermal movement can lead to detachment.
Summary
Careful specification of the roof sheet profile, material and gauge for every project individually is essential to ensure long term roof system performance.
MRC Group has undertaken a review of all the roof sheet profiles and the ability for each profile to withstand both a downward imposed load and the upward wind loading, and the results show a massive difference in each of the profiles and materials to withstand the various project loads. The trend of‘ copy and paste’ specifications could leave the long-term performance of the roof system defective.
Considerations on how the steel will perform are important when selecting steel for a project.
One profile doesn’ t fit all.
DO YOU HAVE A GREAT PROJECT OR STORY TO SHARE WITH SA ROOFING READERS?
Send your article and high resolution images to Candace Sofianos King at candace @ interactmedia. co. za or call + 27( 0) 11 579 4940 for more information.
CONTACT US: 0861 727 663 / www. saroofing. co. za
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JULY 2018