How Do I Rebuild a Chimney Crown?

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Crown Rebuild Overview and Detail Steps by Midtown Chimney Sweeps.
How to remove a chimney crown and replace it with rebar, forms, and crown coat to finish.
We show you two different types of deteriorated masonry chimneys in the USA and how we chose to repair the top surface, or crown/ wash.
We acknowledge that there are many satisfactory and unsatisfactory methods of performing this work. This video is not our approach to all chimneys in all cases, but a sample test case for two that made sense to us at the moment.
We have turned off comments therefore because we know there are many methods of performing this task, and this video is for informational purposes and we hope it will help a few folks out there navigate their own personal chimney challenge.
Thank you for watching and we hope this is helpful. .
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The technical items shared about chimneys are intended for professional chimney sweeps to view use as they see fit. Midtown makes no claims to quality, practice or proper training for viewers. These videos are NOT instructing customers or professionals how to use, operate or install a fireplace properly. We are sharing generally useful information on the subject of chimneys and fireplaces which might give both homeowners and professionals small ideas and big ideas. Each fireplace should be serviced according to local and national building codes and standards, and the manufacturers instructions, if applicable.
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Опубликовано:

10 сен 2024

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Комментарии : 8

@danielvanvalkenburg7759 4 месяца назад

So, did you fix the gap (missing mortar) between the flue tiles?

@Midtownsweepsfranchise 3 месяца назад

You bet! We brought the whole fireplace and chimney back to code compliance! Good catch!

@Midtownsweepsfranchise Месяц назад

Yes we did! Thanks for checking up on me though! Have a good one.

@jeffdeluca1153 Месяц назад

Excellent work! I have a question. I'm in PA climate area and my chimney looks like it was basically parged - that's gone. The flue liners look surprisingly good for 85 years old! But they only stick up about 2 1/2" above the top of the brick chimney. I would like to pour a nice concrete crown but would need to extend the flues??? Am I thinking this correctly? I'd like a good 3" - 4" crown, sloped of course. So do I just add approx. 6" to the flues? How much are they supposed to rise above the crown? And the mortar joint would be embedded in the new crown. What type mortar do I use to bond the flue sections? Please correct any of the above. Jeff

@Midtownsweepsfranchise Месяц назад

HI Jeff, that sounds correct. Use CONCRETE to build a new crown with the slope, etc (available at H Depot). The flue tile should stick up 2in above the new crown. The joint of the new-to-old flue tile should be joined with refractory mortar (available Amazon). Clay flue tiles can be purchased at local masonry brick yards. The most common size out here is 12 x12 OD. Now this might sorta undo what we just discussed above, but I wanted to answer your questions before giving my opinon. So now here is my opinion 🙂 Regarding the parged flue interior... that is great, but most certified sweeps will say it is not good, and I agree with them. Monoxide and heat transfer through tiny joints and we wish to fully contain all the byproducts all the way to the outside world... if you see raw clay brick and associated joints when looking down, not flue tiles, it is recommended to reline- with stainless steel. And the stainless steel tube has to be sized for the fireplace opening (in ratio, ex 1/12 ratio of flue is round). Call a local certified guy perhaps? Good luck!

@jeffdeluca1153 Месяц назад

@Midtownsweepsfranchise Thank you so much for your reply. Most "Tubers" honestly won't bother. Anyway, I may have confused you... the top of chimney brick, the crown, is what was parked, NOT the flue. The flue is clay tile in good shape. Wish I could send a pic.

@jeffdeluca1153 Месяц назад

@Midtownsweepsfranchise Also, is it suitable to have the refractory flue joint in the middle of my concrete crown, or do I need to cut the old flue below the level of the bottom of the new crown so that joint is not in the crown concrete? Thanks so much!

@jeffdeluca1153 Месяц назад

@Midtownsweepsfranchise The flue isn't parged, sorry if I confused you. The top of the chimney crown was parged, no concrete crown.