Interlocking Pours

Interlocking Point for Concrete Pour

We have neither the money nor the expertise to pour the entire building all in one shot, as thrilling as that might be. My solution is to carefully plan my cold joints.

This is the south west corner of the Abattoir about 15′ up the wall. The rebar and stone helped to lock this pour to the next when the time came.

By leaving the surface of this pour rough and wetting it we got better bonding.

The keying and bevel of the bump help to make sure no moisture will travel inward on the cold joint.

For extra insurance I made the walls a little thicker for a bit of extra strength.

Outdoors: 54°F/28°F Cloudy
Tiny Cottage: 60°F/58°F

Daily Spark: When you’re paranoid there are no coincidences.

About Walter Jeffries

Tinker, Tailor...
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4 Responses to Interlocking Pours

  1. Nance says:

    I don’t know how you think of everything. I’d have got the rebar/stone, the interlocking key part . . . but I’d have missed the bevel and the bump. I follow this construction project in awe.

  2. Farmerbob1 says:


    In the last sentence, I’d replace ‘maked’ with ‘made’

    I’m also curious why you used the stone as well as the rebar. Is there a specific reason?

    • Thanks for catching that, I’ll blame that on late night blurry eyes. :) I always appreciate the extra eyes of others proofing my writings.

      The granite is very strong and makes sharp, strong joint contacts between the pours. The rock is also cheap. The rebar is more expensive and a longer tensor. These cold joints are because we poured as we had the money available – we didn’t have any government grants nor any bank loans. The result was we would put up forms and such while we saved our pennies to do the next pour. But that pour might not be enough to fill the walls all the way to the top. By designing the pours to put the cold joints in compression with interlocking keys we end up with a very strong wall. It is a make do that is excellent, just not conventional. The rocks lock the pours together. Some of the rocks are six inches tall, others are three feet tall and thick. Think of them as crenels on the castle.

      • Farmerbob1 says:

        ‘I maded the walls a little thicker’

        Heheh, I see what you did there!

        I was just curious about the use of the rock, since there was already rebar there. I would have immediately understood it if there hadn’t been any rebar.

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