Installing chimney liner and increasing chimney height

[sticksnstones]

Hi all, we are in new York and have a brick chimney with 3 flues (2 fireplaces, one oil fired furnace). Each has a clay flu. Chimney was built in 1969. The chimney is completely within the house except for the last 3' above the roofline. We bought a used but excellent condition Hampton HI 3000 for one of the fireplaces that we hope to get in this season. The bricks on the exterior portion of the chimney are being repaired next week and in the process we are raising the chimney almost 3' so it is code compliant. We have a double wall smooth 6" liner with 1/4" insulation wrap ready to install into the existing flu that is getting the insert. My question is this; When my mason builds the chimney higher, should we install the liner beforehand and have him cement up the liner? Or should we have him extend the height of the existing clay flues with same and then slip the liner down afterwards? Look forward to all your knowledgeable feedback!

 

[begreen]

I would have them extend the height first with the clay tiles. Then slip the liner afterward.

 

[claydogg84]

I don't think doing it before he lays the brick will help. Well it certainly won't help the mason as it will be a bit in his way. I think sliding it down when he's done will be fine as long as he cleans all his tile joints well.

 

[sticksnstones]

I would have them extend the height first with the clay tiles. Then slip the liner afterward.

Common sense told me this was the way to go. Common sense also told to make sure by posting the question on this forum! Thanks for the input.

 

[sticksnstones]

I don't think doing it before he lays the brick will help. Well it certainly won't help the mason as it will be a bit in his way. I think sliding it down when he's done will be fine as long as he cleans all his tile joins well.

Thank you for the quick reply.