Adding the stylish furniture in home can be very effective in increasing the home vlaue. 

The pictures were very helpful - thank you.  It looks like only the first ply/layer came apart which is not optimal but minimal risk for coming apart allowing the ridge vent to come off especially if they used every nail hole during installation. The bug barrier appears to be intact and the breakage of the plywood would not interfere with that.

What did you decide to do then? Following the proper process would help.

Many pests like raccoons, squirrels or mice crawl into the house through the attic and crawl spaces if there are no barriers to prevent them from getting in. They may have mites, fleas, bugs and other pests, which may infest your home. Therefore it is necessary to implant a proper barrier and maintain a proper ventilation in our attics. The pest exterminator New Jersey professionals may also be consulted for the same to get better suggestions.

That would really be a question for the roofer on the split wood.  As for a bug barrier; that would be a question for a pest control company but that has never been a significant issue in our experience.  It is very important that there be adequate ventilation in all attic spaces that are not heated.

You can proform both jobs at the same time if you are good at what you do. I have in the past grinded a Grove in the brick chimney all four sides then used a brake to bend a little half inch lip on the top of my flashing metal flashing into massonary Grove then caulked you will never ever have to worry about again in your lifetime Only reason I did massonary work first is because I didn't want to get my shingles all dusted.

The masonry work should be performed prior to repairs to the existing roofing, unless the roof is leaking, whereupon you may need to make intermediate repairs to stop the leaking while the masonry work is performed.

Masonry work first. Best, Ken

The new ridge vent should have the bug/snow/rain barrier integrated into the venting system. There are probably many other areas in the attic into which "bugs" could enter, but attics do not typically make the best habitats since the temperatures can be extreme and there is no "relatively nearby" source of water for them to survive. The "integrated mesh" is more for helping to prevent wind blown rain and snow from entering the attic space and settling on whatevr lies below.

Definitely before you do the roof, masonary work and any flashing around the chimney should be done prior to starting on the roofing.

Our recommendation would be to do the massonry work first and then roofing for a few different reasons.

1.This gives the masons freedom to step and walk on the roof without causing damage to the new shingles. 

2. You will want to make sure the new flashing that is intstalled around the chimney is installed correctly, accounting for any masonry changes and is not damaged due to installation.

3. Ultimately, that the new roof is not damaged and that the warranty does not get voided. 

It is always better to repair the chimney prior to any roofing work. This way the new roof doesn't get damaged. 

Each case is unique but in general, the chimney should be done first. Special attention should be paid to the roof flashings around the chimney.  If the flashings are behind the stone then make sure they extend far enough into the shingles so the new roof can be flashed properly. If the flashings are surface mounted and there is a counter flashing then the roofer should have no problem making the chimney base watertight