DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Bricks, Masonry and Concrete > Fireplace Brick Problem




Help Support House Repair Talk by donating using the link above.
Reply
 
Thread Tools Search this Thread
Old 01-13-2007, 11:57 AM  
DAVID GEHRING
Junior Member
Join Date: Jan 2007
Posts: 1
Default Fireplace Brick Problem

We are having problems with a white substance leaching through our fireplace bricks. Since we live in Seattle which is known for its precipitation, I'm wondering if this might be the cause of the problem.

The bricks are clear, unpainted bricks. My wife washed them, the the same white material was back in a week.

Any advice as to how this can be treated and prevented would be greatly appriated.

Thanks

Dave


DAVID GEHRING is offline  
 
Reply With Quote
Old 01-13-2007, 11:20 PM  
glennjanie
Senior Member
Join Date: Mar 2006
Posts: 2,990
Liked 4 Times on 4 Posts

Default

The way I understand it this is lime leaching out of the mortar. I would think there has to be water creeping through there to do that. Therefore, I would check the flashing on the roof, put a full sheet metal cover on the chimney and spray the rest of the exposed chimney (outside) with several coats of clear silicone, and repeat the spray every 6 months.
Glenn


glennjanie is offline  
 
Reply With Quote
Old 01-14-2007, 02:07 PM  
mudmixer
Contractor
 
mudmixer's Avatar
Join Date: Sep 2006
Location: St. Paul/Minneapolis, MN
Posts: 667
Liked 76 Times on 59 Posts
Likes Given: 68

Default

Take a hard look at the crown of the chimney. - The concrete placed on top of brick that should shed water off the chimney. Make sure there is not a gap between the chimney flue and the concrete.

Dick
mudmixer is online now  
 
Reply With Quote
Old 01-14-2007, 06:33 PM  
asbestos
Good with caulk
 
asbestos's Avatar
Join Date: Feb 2006
Posts: 244
Liked 3 Times on 3 Posts
Likes Given: 2

Default Efflorescence

that's the ticket!

Google it


no rain in WA, has not rained here in like, 2 weeks
__________________
Everyone is entitled to their own opinion, but not their own facts
asbestos is offline  
 
Reply With Quote
Old 01-15-2007, 06:33 PM  
Bud Cline
Tile Contractor
Join Date: Apr 2006
Posts: 284
Default

This white substance is known as efflorescence. It can be caused by lime or natural salts that exist in the portland cement.

Moisture is activating the salts and evaporation is bringing it to the surface of the brick. It will play out over time but that could take years.

Find the source of the moisture and correct it, the leeching will subside and can then be cleaned away one final time.

If the chimney is not capped, cap it with an oversized cap that will prevent blowing rain from coming down the inside of the chimney. Also look for other sources of moisture. Bad flashing to roof, missing or loose mortar between the bricks, cracks in the mortar, soft brick makeup, anything that would allow moisture in to the chimney materials.

If no obvious source of leaking can be found then seal the bricks and mortar on the outside thoroughly.


Bud Cline is offline  
 
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
Brick mantel on brick fireplace...help! Tmswilson Bricks, Masonry and Concrete 3 10-19-2012 09:28 AM
Tile over brick fireplace Cody84 Flooring 4 04-24-2012 06:54 PM
Covering a Brick Fireplace keleuteri Bricks, Masonry and Concrete 2 06-24-2009 05:14 PM
Removing Brick Fireplace. Daddio Bricks, Masonry and Concrete 4 03-19-2009 08:03 AM
refacing a brick fireplace tomb HouseRepairTalk Website Help 2 01-19-2009 07:01 AM



Newest Threads