Laying 4x8x16 Cement Block.. Top/botton - Building & Construction - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction


Thread Tools Display Modes
Old 08-01-2008, 07:49 AM   #1
Join Date: Aug 2008
Posts: 1
Rewards Points: 10

laying 4x8x16 cement block.. top/botton

I am about to lay these blocks and have a couple of questions. They are old blocks. I tapped off the old mortor with the back of a hammer. Do I need to do anything to the contact services to assure good adhesion before appling mortor? Also...I can't identify which side should be top/bottom. One side has broad flat surfaces while the other is much narrower. I suspect the broad surface should be up since it is easier to lay mortor on a wider surface. Please correct me if I'm wrong. Blocks are 4x8x16 double bullnose. Thanks, Bob


ohpoppy is offline   Reply With Quote
Old 08-01-2008, 08:33 AM   #2
concretemasonry's Avatar
Join Date: Oct 2006
Location: Minneapolis/St. Paul, Minnesota - Latitude 45.057 Longitude -93.074
Posts: 4,068
Rewards Points: 2,626

You are right - The surface with the wider face shells is the top. It is called a "mortar bed" because it allows a better bed of mortar without sloppimg excess mortar into the cores. - All block have a top and bottom. They are made in one way and turned 180 degrees to lay.

4" block can be fussy to lay because of the height to width ratio. As an example, and many good masonry contractors use a higher labor cost for laying 4" than 6" or 8".

Make sure you have removed all loose mortar and any mortar what could make leveling difficult. Use a Type N mortar, but Type S could also be used. For a small qualtity, definitely use pre-proportioned mortar in a bag.



concretemasonry is online now   Reply With Quote

Thread Tools
Display Modes

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
"Maintenance Free" Siding Materials (Vinyl, Steel, Fiber Cement) diggitydog Building & Construction 12 01-23-2009 04:24 PM
How to install belgian block? Tmb9862 Building & Construction 2 09-19-2008 04:50 PM
Rotten cement - skim coat or board? BradG Building & Construction 1 11-25-2007 02:25 PM
Best way to insulating a heated detached cement block garage Joe Nulph Building & Construction 1 03-06-2006 10:30 AM
Siding: Cement Vs. Cedar Grumpy Remodeling 5 03-19-2005 01:07 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1