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What are some of the better ways to install a curb on a metal roof.
Type of sealants for this?
 

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We install commercial kitchen hood exhaust and make air fans. These come with curbs - I have tried the under over and the over over methods both seem to leak....
 

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If in snow country, the higher the curb the better. Use lots of Ice & Water Shield. Make a cricket on the uphill side of the curb.
Jim
 

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The installation guide from Fabral is the best I've seen www.fabral.com go to tech. Most of it can be PDF filed on to your PC. A flashing kit should come with a quality vent, but if not use the info there to pattern your own cricket from sheet stock. We have an arrangement with the local A/C guy to brake me up whatever we need.
 
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