Block on flat or cavity block for garden wall

bikeguy

Hi I want to build a block wall at the side of the house roughy 4m by 2m. Is there any advantage to building it block on flat or with cavity blocks? I would probably fill the cavity blocks with concrete and rebar and could add 2 pillers on either end if needed. Alternatively block on flat with 2 pillers

JustJoe7240

Block on flat would be fine, Not sure how you'd fill the cavity with steel and concrete

Dr Turk Turkelton

Cavity Blocks would be better as you wouldn't even need pillars. Just drill 16mm rebar through the cells in the cavities at both ends and in the middle of the wall. Drill the hole with an 18mm drill bit 150mm+ deep and put in chemical anchor first.

Drill it after your first course of blocks is set out and put in about 600mm length and when wall is finished drop another length in to go beside it and concrete.

This method will mean you have no pillars when mowing your lawn.

bikeguy

Well the block is hollow so I would just set the rebar in the foundation when poured and slip the blocks over

bikeguy

@Dr Turk Turkelton are you talking about putting the rebar horizontal? I had vertical in mind setting it in the foundation. And my idea around doing this was to avoid pillers

Dr Turk Turkelton

This is an overhead view of your wall 10 blocks long which will stretch 4.5 metres.

Put the rebar in where the x's are.

This is s side view of the first course of blocks laid.

The starter bars are chemical anchored in 150mm into your concrete foundation sticking up approx 450mm.

Then drop a second rebar beside them to the height of the wall and fill with wet concrete.

Asdfgh2020

Block on flat is your only ‘man’ effin around with rebar and filling cavity is only adding hardship and time to the project. When say 4 x 2 m do you mean 4m long x 2m high…?

bikeguy

@Asdfgh2020

I hear you but it’s half the amount of blocks easier to align/keep plumb and can avoid pillers. Yes 4m long 2m high

bikeguy

@Dr Turk Turkelton

thank you I think we are on the same page, I had thought of putting rebar in every second hole as per your first diagram. Would you also put a length of rebar going horizontal positioned myb halfway up the wall?

pogcica

Who are you trying to keep out ? Russians , Taliban, Neighbours, plant a hedge, green the place up a bit. Cannot understand the mentality of irish people building compounds to live behind. And feckin rebar.. are you trying to stop a missile?.

Dr Turk Turkelton

https://www.boards.ie/discussion/comment/121919525#Comment_121919525

Don't do it this way, you will never have it in the right place to align with the cells. Also a 25kg cavity block is quite the lift to reech over a 2 metre high length of rebar.

Dr Turk Turkelton

https://www.boards.ie/discussion/comment/121919611#Comment_121919611

No you won't need it every second hole. Just the two end cells at either end and two cells in the middle would do you.

Edit; you won't need a horizontal rebar either.

bikeguy

@Dr Turk Turkelton

Yeah I realise this I was gna myb leave the first bit of bar sticking up 1m and place the other beside it as I build up but I other difficulty in getting the placement of the rebar so chemical anchor might be a good shout

thomas 123

https://www.boards.ie/discussion/comment/121919613#Comment_121919613

This gave me a chuckle.

bfclancy2

no need for rebar unless its a retaining wall