Old chimney tear down to roofline

[vogelzang87]

Hi there im getting a new roof put on and want to eliminate the top of the chimey just below the roof line and just do a stainless cap.I will be installing a flex liner and be putting in a harmon accentra what can someone tell me which top cap rain cap will work with 4in flex liner? Thanks.

 

[Whitenuckler]

Hi there im getting a new roof put on and want to eliminate the top of the chimey just below the roof line and just do a stainless cap.I will be installing a flex liner and be putting in a harmon accentra what can someone tell me which top cap rain cap will work with 4in flex liner? Thanks.View attachment 347935

You might need a custom made cap? Would you leave 12 inches of the existing chimney and all the flashing? If you are redoing everything, then you would be looking at all new, and the product manual for the vent pipe should have all the parts.

 

[bholler]

Hi there im getting a new roof put on and want to eliminate the top of the chimey just below the roof line and just do a stainless cap.I will be installing a flex liner and be putting in a harmon accentra what can someone tell me which top cap rain cap will work with 4in flex liner? Thanks.View attachment 347935

You cant just run flex through the roof. You would need to transition to pellet vent or class a chimney

 

[stoveliker]

@bholler does the 2-3-10 rule also apply to pellet venting?
The OP mentions cutting the height down to below the roofline, which I read to be below the ridge, which could run into issues if that rule applies for pellet venting too.

 

[bholler]

@bholler does the 2-3-10 rule also apply to pellet venting?
The OP mentions cutting the height down to below the roofline, which I read to be below the ridge, which could run into issues if that rule applies for pellet venting too.

I believe so when coming through the roof. But the stove manual should say for sure. I dont install many through the roof so I am not positive

 

[Whitenuckler]

I believe so when coming through the roof. But the stove manual should say for sure. I dont install many through the roof so I am not positive

From my P43 Install manual. Since a pellet stove can vent out the side of a house (with limitations), I guess almost anything on the roof would work unless there were prevailing winds or a skylight window that opened ect.

 

[stovelark]

If you are coming down to roofline with masonry chimney, capping at that point with a ss cover, when the flex liner on the inner side reaches the top, you'd transition to rigid 4" pellet vent, come through the ss cover, and terminate with short run of rigid vent, storm collar and vertical cap. I do not believe you have to follow the 10/3/2 rule because its a forced exhaust, but the manual should tell you the minimum pipe coming through to termination, I believe it is based on the roofline pitch. Your stove manual will guide that requirement. Hope this helps. Flex liner as BHoller said, can only reside in a masonry flue. Good luck.