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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.
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.
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
I would recommend a licenced mason Please don't have a handyperson do it. It will look terrible and may not withstand an siemic even properly.
i would call some of the licenced home builder in your area and ask them who they would recommend/
Masons would install mortar on bricks.
Metal roof pricing ranges on what the structure details are (steepness, valleys, penetrations, wall flashings, chimneys, etc.) and what gauge, profile, ventilation and snow retention (if any) is needed or requested.
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