Expansion joints in concrete

[GaryN]

Hi Tony,
Long time since I've visited the forum!

I'm making an existing concrete slab wider for a shed base.
Two questions:
1. Can I lay the concrete right up to the existing slab or do I need an expansion joint?
2. The strip of concrete which I will be laying is quite narrow. It will be 3 meters by 600mm by 120mm deep. Will this need an expansion joint in the middle.

Okay, I confess, I make a cock up; I poured the slab thinking the shed was 10' x 6' but it's 10' x 8' !

Many thanks
Gary

[seanandruby]

in a word.. yes. it never hurts to ere on the side of caution.

[Dave_L]

Okay, I confess, I make a cock up; I poured the slab thinking the shed was 10' x 6' but it's 10' x 8' !

At least you are honest! You're not the first and you certainly won't be the last!

[lutonlagerlout]

for a shed base i wouldnt have thought an extra 600 warranted an expansion joint,it would move along the joint anyway IYKWIM
cheers LLL

[Ted]

I agree with LLL. I have done exactly the same mistake as you before. I just tacked the concrete on the side of the existing slab. It is still joined on and works fine as a shed base.

[GaryN]

Thanks Gents for your replies