{"id":1376,"date":"2026-05-20T16:01:15","date_gmt":"2026-05-20T21:01:15","guid":{"rendered":"https:\/\/plumbing101.i234.me\/wordpress\/?p=1376"},"modified":"2026-05-17T05:08:21","modified_gmt":"2026-05-17T10:08:21","slug":"old-cast-iron-hub-leak-returns-after-35-years","status":"publish","type":"post","link":"https:\/\/plumbing101.i234.me\/wordpress\/old-cast-iron-hub-leak-returns-after-35-years\/","title":{"rendered":"Old Cast Iron Hub Leak Returns After 35 Years"},"content":{"rendered":"

Some plumbing problems never fully go away.<\/p>\n

They may stay quiet for decades.<\/p>\n

Then one day, a soft floor or stained wall brings them back.<\/p>\n

That seems to be the case in this old 1910 home.<\/p>\n

The owners bought the house nearly 40 years ago.<\/p>\n

A few years later, they gutted the upstairs bathroom.<\/p>\n

During that job, the plumber found a strange old drain hub.<\/p>\n

It sat under the wall behind the toilet and sink.<\/p>\n

The warning signs were already clear.<\/p>\n

Paint and plaster were failing near the closet floor.<\/p>\n

That damage pointed to moisture inside the wall.<\/p>\n

The plumber opened the closet wall.<\/p>\n

He also cut part of the closet floor.<\/p>\n

What he found was not common modern plumbing.<\/p>\n

The piece looked like a black iron bowling ball.<\/p>\n

Several waste lines entered it at odd angles.<\/p>\n

The toilet, sink, and bathtub drains are all tied into it.<\/p>\n

One pipe dropped straight down from the bottom.<\/p>\n

The top of the hub had a hole.<\/p>\n

When hot water ran, steam came out of it.<\/p>\n

Instead of replacing the old hub, the plumber patched it.<\/p>\n

He used fiberglass and hydraulic cement.<\/p>\n

Then the wall and floor were closed again.<\/p>\n

That repair lasted about 35 years.<\/p>\n

Now the same closet shows moisture damage again.<\/p>\n

There is also a dip in the bathroom tile floor.<\/p>\n

One small hex tile has come loose.<\/p>\n

That matters because the floor does not get wet from above.<\/p>\n

Moisture may be reaching the subfloor from below.<\/p>\n

That can damage plywood and loosen tile.<\/p>\n

It can also hide rot under a finished bathroom floor.<\/p>\n

The smart next step is inspection, not panic.<\/p>\n

Opening the closet wall and floor makes sense.<\/p>\n

A small inspection camera may also help.<\/p>\n

That can show the underside of the bathroom floor.<\/p>\n

It may also show the old hub and tub waste line.<\/p>\n

Cast iron plumbing can last many years.<\/p>\n

Still, it can rust, crack, or leak at joints.<\/p>\n

The EPA mold guide<\/a> explains why hidden moisture should be fixed.<\/p>\n

The HUD moisture guide<\/a> also covers home moisture risks.<\/p>\n

Question<\/h2>\n

Can an old patched cast-iron waste hub start leaking again?<\/p>\n

Answer<\/h2>\n

Yes. A patch can fail after years of heat, moisture, movement, and age.<\/strong><\/p>\n

The best fix is usually to expose the area and inspect the full drain assembly.<\/strong><\/p>\n

If the hub or pipe is cracked, replacement may be safer than another patch.<\/strong><\/p>\n

This repair could stay small.<\/p>\n

It may only need a new section of drain pipe.<\/p>\n

But it could also become a bathroom floor repair.<\/p>\n

If the tub waste line is cast iron, it should be checked too.<\/p>\n

Old fittings often fail together.<\/p>\n

The main goal is to find the leak before more damage spreads.<\/p>\n

A licensed plumber should inspect the hub before demolition grows.<\/p>\n

That can help avoid guesswork and wasted repair costs.<\/p>\n

Old homes often hide odd plumbing choices.<\/p>\n

This one may be a reminder of that fact.<\/p>\n

A repair that worked for 35 years still may not be permanent.<\/p>\n

I’m Chris Mayer, writing for Plumbing 101<\/a>.<\/p>\n

\"Old
Old Cast Iron Hub Leak Returns After 35 Years<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"

Some plumbing problems never fully go away. They may stay quiet for decades. Then one day, a soft floor or stained wall brings them back. That seems to be the case in this old 1910 home. The owners bought the house nearly 40 years ago. A few years later, they gutted the upstairs bathroom. During… Continue reading Old Cast Iron Hub Leak Returns After 35 Years<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":1611,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_wpscp_schedule_draft_date":"","_wpscp_schedule_republish_date":"","_wpscppro_advance_schedule":false,"_wpscppro_advance_schedule_date":"","_wpscppro_dont_share_socialmedia":null,"_wpscppro_custom_social_share_image":0,"_facebook_share_type":"default","_twitter_share_type":"default","_linkedin_share_type":"default","_pinterest_share_type":"default","_linkedin_share_type_page":"","_instagram_share_type":"default","_medium_share_type":"default","_threads_share_type":"default","_google_business_share_type":"default","_selected_social_profile":[],"_wpsp_enable_custom_social_template":false,"_wpsp_social_scheduling":{"enabled":false,"datetime":null,"platforms":[],"status":"template_only","dateOption":"today","timeOption":"now","customDays":"","customHours":"","customDate":"","customTime":"","schedulingType":"absolute"},"_wpsp_active_default_template":true},"categories":[79],"tags":[1212,896,1213,1210,1335,1209,109,111,1211,1336,1334,229,436,1208,115,343,1332,1214,1333],"class_list":["post-1376","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general-plumbing-help","tag-1910-house-plumbing","tag-after","tag-bathroom-drain-leak","tag-bathroom-floor-leak","tag-cast","tag-cast-iron-waste-pipe","tag-general","tag-help","tag-hidden-plumbing-leak","tag-hub","tag-iron","tag-leak","tag-old","tag-old-cast-iron-plumbing","tag-plumbing","tag-plumbing-repair","tag-returns","tag-vintage-plumbing","tag-years","entry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/plumbing101.i234.me\/wordpress\/wp-json\/wp\/v2\/posts\/1376","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/plumbing101.i234.me\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/plumbing101.i234.me\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/plumbing101.i234.me\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/plumbing101.i234.me\/wordpress\/wp-json\/wp\/v2\/comments?post=1376"}],"version-history":[{"count":1,"href":"https:\/\/plumbing101.i234.me\/wordpress\/wp-json\/wp\/v2\/posts\/1376\/revisions"}],"predecessor-version":[{"id":1612,"href":"https:\/\/plumbing101.i234.me\/wordpress\/wp-json\/wp\/v2\/posts\/1376\/revisions\/1612"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/plumbing101.i234.me\/wordpress\/wp-json\/wp\/v2\/media\/1611"}],"wp:attachment":[{"href":"https:\/\/plumbing101.i234.me\/wordpress\/wp-json\/wp\/v2\/media?parent=1376"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/plumbing101.i234.me\/wordpress\/wp-json\/wp\/v2\/categories?post=1376"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/plumbing101.i234.me\/wordpress\/wp-json\/wp\/v2\/tags?post=1376"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}