Posted by Billy NY on November 06, 2013 at 07:22:18 from (72.226.79.200):
In Reply to: Concrete block wall posted by Brad Buchanan on November 06, 2013 at 06:56:43:
I would not let the lack of experience stop me from using C.M.U. (concrete masonry units) I am not familiar with block bond, what is it ?
It starts with layout, is this starting from an existing slab, any stub ups or risers, electric, water or similar in the wall ?
From a level slab, or even if the first course has to take some slack on the bottom to level out, its not all that difficult, especially for something you are doing at home.
Layout the slab, drill and epoxy in, #4 deformed bar, (rebar) every few courses if you need to tie into the slab. You may not need to, but its a common detail with CMU construction. You need to set your corners, plum/level, and you can use a string line from the corners, start building the walls, use a level to check plumb and level, have your mortar ready, butter the preceding course, set, tap plumb and level, strike the joint soon after, and don't get in a hurry, odds are if you can keep plumb, level with any other type of construction, take a look on you tube or similar, its not really difficult at all.
Hohmann-Barnard is an excellent supplier of masonry accessories, commonly specified on many jobs I have done, ladder mesh is a nice accessory to reinforce CMU.
If you have any shear wall, no corners you will need to anchor the top of wall.
If you have electric or similar to stub up, you will need to coordinate that as you go up, meaning raise the conduit with the wall, set back boxes or anything in the wall, could go surface mount if need be.
If there is anything to be fastened to the walls it is wise to fill those cells or surrounding area for mechanical fasteners, hollow cells will hold, but its a much better job when solid.
I've been a project manager on many many jobs, with large amounts of CMU type walls, much of it reinforced correctional facility work, as well as high strength CMU, structural walls, but never laid a single CMU as a mason. I did a small CMU job to install a Bilco door to access a basement, I did the layout, and built it without any problems at all. Its all in the layout, keeping plumb/level etc. Its nice and neater to have a CMU wet saw, but I used a mason's hammer to make my cuts, regular strength CMU, was fine, I'd not do it with high strength CMU. I would not be intimidated by not having done it, jump in, try it, learn as you go, before you know it, you'll know how to do it.
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