Can I cement the external furnace exhaust pipe?

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Oct 31st, 2020 9:12 am

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Oct 29th, 2020 9:20 am

Curiousah [OP]: Jr. Member; Nov 1, 2015; 148 posts; 215 upvotes; London, ON

Oct 29th, 2020 9:20 am

Can I cement the external furnace exhaust pipe?

My white PVC furnace exhaust pipe cracked off the side of my house. I have the broken end. Is there a specific safe product I can use to cement/glue/repair this pipe without replacing it? I have no tools or knowledge to remove the broken pipe and install a new one. If I can't just stick the broken piece back on, what type of professional do I need to call to fix this?

11 replies

Oct 29th, 2020 9:31 am

exrcoupe: Deal Addict; Apr 26, 2003; 3146 posts; 2328 upvotes; GTA

Oct 29th, 2020 9:31 am

If it's just the white PVC pipe, you can buy a new piece, get a bottle of the PVC glue and glue on the extension piece. It's just a vent extension.

+1

Oct 29th, 2020 9:58 am

Curiousah [OP]: Jr. Member; Nov 1, 2015; 148 posts; 215 upvotes; London, ON

Oct 29th, 2020 9:58 am

Thanks for your reply. When you say PVC glue, do you mean something like this? https://www.homedepot.ca/product/oatey- ... 1000722695 I just don't know what to even buy. I assume it has to allow for extreme temperature changes and getting wet outside? Since the cold is probably why it cracked in the first place?

Oct 29th, 2020 10:08 am

newlyborn: Deal Addict; Jun 16, 2009; 4939 posts; 4124 upvotes; Vaughan

Oct 29th, 2020 10:08 am

Please post the pic of your pipe and possibly pic of where its broken. Depending on the type of pipe , it can be determine d if repairs are allowed by code. White pipe can be 636, Royal or PVC. If its 636 or royal than you can do the repairs on pipe but using the same fittings and glue meant for particular type. If you are unsure how, than you can hire any Gas technician in your area to do repairs. Exhaust pipe is meant to take CO outside produced by furnace , so play diligently.

Curiousah wrote: ↑ My white PVC furnace exhaust pipe cracked off the side of my house. I have the broken end. Is there a specific safe product I can use to cement/glue/repair this pipe without replacing it? I have no tools or knowledge to remove the broken pipe and install a new one. If I can't just stick the broken piece back on, what type of professional do I need to call to fix this?

Certified HVAC Pro. Committed to Customer, not brand. Past RFD Review
2024 AC, Furnace, Heat Pump and Water Heater Groupbuy

+2

Oct 29th, 2020 10:23 am

Curiousah [OP]: Jr. Member; Nov 1, 2015; 148 posts; 215 upvotes; London, ON

Oct 29th, 2020 10:23 am

Picture of whole area, broken pipe piece sitting on top. Second white pipe from left broken. Hot air comes out of the broken pipe at the same time as furnace running inside, hope I got the purpose right. [img]https://i.imgur.com/8JEvSbG.jpg[/img]

Last edited by Curiousah on Nov 1st, 2020 11:40 am, edited 1 time in total.

Oct 29th, 2020 10:31 am

jdmfishingonly: Deal Guru; Oct 13, 2008; 10440 posts; 6033 upvotes; Durham

Oct 29th, 2020 10:31 am

There is NO need to have the pipe extending more than 4" from the wall .. a slight angle down would suffice

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Oct 29th, 2020 10:57 am

newlyborn: Deal Addict; Jun 16, 2009; 4939 posts; 4124 upvotes; Vaughan

Oct 29th, 2020 10:57 am

@Curiousah min distance from intake and exhaust is min 12" but you should also counsult manufacture specs as it may be different for your furnace. Since the pipe is outside and it looks like its 636, you can buy the fittings, pipe and glue for 636 in homedepot. I am assuming that previous installer extended the vent as per code requirements so you may want to follow the same pattern if unsure or cannot find the booklet for your furnace.

Certified HVAC Pro. Committed to Customer, not brand. Past RFD Review
2024 AC, Furnace, Heat Pump and Water Heater Groupbuy

+2

Oct 30th, 2020 1:43 pm

Curiousah [OP]: Jr. Member; Nov 1, 2015; 148 posts; 215 upvotes; London, ON

Oct 30th, 2020 1:43 pm

Thank you everyone for your help. Cut 12" extension piece from new pipe, cut broken pipe end coming out of house so it was square, attached with coupling using System 636 cement. Hope that was right.

Oct 30th, 2020 11:38 pm

1chinaman: Sr. Member; Jan 19, 2013; 713 posts; 641 upvotes; Ottawa

Oct 30th, 2020 11:38 pm

Furnace intake is not up to code btw
Needs 3ft from dryer exhuast...

Oct 31st, 2020 12:00 am

GoodFellaz: Deal Fanatic; Jun 24, 2015; 9114 posts; 3173 upvotes; 0 downvotes

Oct 31st, 2020 12:00 am

cut away the broken pieces, so its nice and straight, glue a coupling piece on, then put a elbow on and bend it down, problem solved

Oct 31st, 2020 8:34 am

fdl: Deal Fanatic; Dec 5, 2009; 5785 posts; 3620 upvotes

Oct 31st, 2020 8:34 am

OP just be mindful it’s not just “hot air” coming out it’s carbon monoxide gas which is poisonous. Please ensure there are no cracks inside the hone.

+1

Oct 31st, 2020 9:12 am

fdl: Deal Fanatic; Dec 5, 2009; 5785 posts; 3620 upvotes

Oct 31st, 2020 9:12 am

Also clean your drier vent. That’s a fire waiting for happen.

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