COMMUNITY FORUM

alexh

12:31PM | 10/17/05
Member Since: 10/28/02
30 lifetime posts
Bvmisc
I put in a bunch of bullnose brick in a landscape application and some of them have hairline cracks usually between the mortar in the joint and the brick itself. I'm not really worried about it - I have no freeze here but I'd like to know why it may have happened so I can avoid it in the future. It was my first time working with this type of brick and it was a little tricky because there is so much side buttering involved.

I used a 2.5-1 Portland - sand mix with a small amount of fireclay. I used this relatively rich mix because I wanted the mortar to stick to the brick when buttering. It may be my lack of experience but I know that a N-type mix would fall off very easily especially since the nose part of bullnose joint has no support from underneath.

Tooling the joints on these is a little tricky. I had to sort of scrape some mortar out because you start off with a flush joint and also I think I found out it's better to use a wider tool than normal or else the concave part of the joint is much narrower than the total joint width. Also, you can't tool too hard near the nose or you'll just push out the mortar.

I either covered the bricks with plastic or kept them wet for a few days to avoid cracks.

Also, inevitably you get a lot of mortar on the surface of these bricks. I cleaned them with a dmap sponge and in the beginning I may not have realized that getting excessive water on the joint will probably weaken it. I assume it's better to use a damp sponge.

If I had to guess I'd say the reason some cracks showed up is from too much adjustment of the brick after placement, excessive water from cleaning and possibly some shrinkage due to the rich mix.

Any tips are appreciated.

Glenn Good

05:20PM | 10/19/05
Member Since: 09/10/03
314 lifetime posts
Many times the cause or mortar cracking in newly laid brick is dry bricks soaking up the moisture from the mortar too quickly. If you wet or soak the bricks an hour or so before laying them the moisture in the brick will prevent rapid drying of the mortar and help achieve a stronger, better, bond.

Glenn

Moderator: Construction Systems, Foundations, and Masonry & Stone

For more information about me and/or my qualifications please visit my website at:

www.consultationdirect.com
Click_to_reply_button
Inspiration_banner

INSPIRATION GALLERY



Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.

Reply_choose_button

Anonymous

Post_new_button or Login_button
Register

With nothing more than a saw and some plywood, you can create your own Christmas tree cutout forest. Give the "tree" a coa... Filling an underutilized area beneath the stairs is a smart way to save space. Doing so with a stash of wood, however, is ... The Audubon Society inspired wallpaper in this Adirondack-styled entryway will get you in the outdoor mood. Grab your coat... Chalkboard paint opens up endless possibilities for customizing your dresser time and time again. Use chalk to label the c... A fireplace in the bathroom creates the ultimate setting for relaxation. Homeowners often choose electric or gas over wood... This roomy boot tray made from punched metal stands up to all the elements. Station it in your mudroom or at your back doo... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... FLOR carpet tiles are a simple and affordable way to customize a floor covering for any space. You can make anything from ... Chalkboard paint features prominently in this elegant yet unpretentious headboard design. Add a new message daily to reflec... Salvaged boards in varying widths and colors make up the dramatic accent wall in this attic space. The high-gloss white of... The indecisive homeowner need not fret over choosing one (or even two) cabinet colors. The kitchen cabinets in this artist... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... Simple and striking, a couple of pieces of "lovingly used" furniture creates a special kind of charm. A weathered chair fo... First dress up your metal shelves with a coat of paint in an accent color that complements your kitchen decor. Then arrang... The vibrant green of Granny Smith apples make a beautifully natural alternative to the traditional evergreen wreath. Brigh...
Follow_banner_a
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon