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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