Go to Certainteed Siding. Then click 'Is this job for me?'. Then click on 'Soffits'. From there, you should be on your way!
The Certainteed Home Page is a good library of info. This company owns Ashland-Davis too (which is whose siding I have.) If you need more info, post up.
My best to ya and hope this helps.
© 2016 Renovate Your World LLC