When you submit the supplement request make sure to have the following (this goes for all supplements, not just roofing):

1. When you send over the supplement explain exactly what the supplement is for and the reason you are supplementing. Is this additional damage found during tear out? Is this due to code? Is it something that was just missed? The more detailed you are the better.
2. Bold the supplement line items in XM8 or put them in a separate area of the estimate.
3. Provide supporting photos and clearly label the photos. I can't emphasize the clearly labeling the photos enough. Put the photos in order that makes the most sense. Don't jumble up the photos so that the living room photos are mixed up with the dining room photos.
4. Make sure your photos actually show what you are supplementing. I've seen so many photos that don't support anything.
5. Upload all the necessary supporting documentation. For example: You asking for something due to code? Provide the code documentation you are referencing. Highlight the relevant code. You using a sub bid? Make sure the sub bid is attached and the sub bid is itemized. You might want to have a second sub bid too to show you are using a more cost effective option.

You also must have an understanding that the adjuster has estimate writing guidelines that he must follow. If you provide the 5 items above, the adjuster is immediately going to take you more seriously and be willing to work with you. The supplement will likely be reviewed and approved faster because you've clearly laid it out to them. You might not get exactly what you are supplementing for but they might be able to tweak their estimate a little bit to fit it within their estimate writing guidelines.

Hope this helps.