Casting foundation blocks in two steps.

[josnun]

Hi,

I am going to cast pillars and want them to have the same height. My idea is to cast in two steps since the ground slopes. The difference between the highest and lowest points is about 700mm.

Day 1. Secure all casting pipes and reinforcement bars in a small amount of concrete.
Day 2. Cut all casting pipes so they are all level and fill the casting pipes.

What do those of you who are more experienced than me think?

• Is it okay to cast in two steps, or won't the pillars be as strong?
• Do I need to prime between the castings?
• Anything else I need to consider?

Grateful for all responses.

Best regards,
Johan

 

[Exostor]

There should be no problems if the reinforcement goes straight through both castings.

 

[josnun]

Thank you for the answer. That's the idea. And no primer is needed?

 

[twoody]

No

 

[Exostor]

Make sure to vibrate the plinths properly so that there are no air pockets in the joint.

 

[MathiasS]

....but why?

Drill in anchors if the mountain slopes.
Using a laser, hose level, spirit level, or whatever you have, mark and cut the pipes.
Fix the pipes.
Cast to the finished height.

 

[josnun]

Yes, it might be better to do it in one step. I just imagine that it's easier to fix the pipes first using concrete and then ensure they end up at the correct height.

 

[Exostor]

If you cast adjustable post shoes to attach the bearer to, it doesn't matter much how high the footings are.

 

[josnun]

I will have an attefallshus on the plinths and from what I understand of the plinth arrangement, you shouldn't use any post shoes but instead place the floor joists directly on the plinths. However, I'll check with the supplier before I decide how I will do it.

 

[Mattias_Eson]

I did the same thing this spring when I set plinths for an attefall house (from keostugan (which was rubbish by the way)) but then I let the pipes up a couple of centimeters above the finished height and then measured the height of the concrete while I poured.

The small variations that occurred were compensated for with one or two extra layers of underlayment paper under the bearer.

 

[josnun]

Yes, that could be an option. I will call the supplier on Monday and we'll see what they say. It's unfortunate that your house was junk. I hope I haven't bought junk too (Sorsele cabin).