Hi!

I've acquired a house from the '40s that's now going to get a basement renovation.

I have a hole about 15 cm in diameter where the old fill pipe for the oil tank was. The outside is plastered and sealed, but how do I best cover the hole from the inside?

The next part is a door frame, 8x19, that needs to be removed. Inside the frame is a wooden stud, embedded in the concrete block, used for fastening the frame. If I remove the stud, there will be a deep "groove" in the concrete block. I would prefer to avoid widening the opening by knocking off protruding edges. Is there a simple solution to fill the groove, or is it necessary to cast everything again?

I should add that the finish for both places will be plaster and silicate paint.

I can handle wood constructions, but when it comes to masonry, casting, plastering, and the like, I'm a novice, so anyone kind enough to give tips, please be overly clear. :)
 
Take a brick, piece of concrete, leca or similar of suitable size. Then attach it using plaster in the hole. Then you can plaster over as usual.

You also plaster over the notch in the door frame. Use boards on the sides as supports to get neat edges.

Plastering might seem difficult before you try it, but it's easy for someone with average handiness to do. Google a bit and you will find tons of guides and videos showing how it's done.

For this house, "Putsbruk C" should be the right choice.
 
Thank you for the reply, eviljava!

There are many great threads in this forum about plastering, so the plastering should work out fine.

Plugging the hole with leca sounds simplest. It can be shaped correctly.

The "notch" from the beam is about 100mm wide and about 55mm deep. This would require 10.5 liters of plaster to fill. In that case, filling with coarse concrete K25 might be better. It's just a shame about the drying time...

One could also consider using leca here, but if it needs to be stacked at height, you'll probably want some reinforcement to keep it in place. It also becomes tricky due to the unevenness of the notch.

A metal strip as support behind the plaster, covered in chicken wire so the plaster can adhere, perhaps?

Make a gabion of leca balls and wire and insert it into the notch with an outer layer of concrete? But then the concrete and plaster might crack easily.

There should be the best tip on this forum from wise minds!
 
Or you can glue polystyrene in the groove and plaster over it.
 
Of course, how perfectly sensible! How did I not think of that? :banghead:

Thank you so much for the help!
 
Or buy a cheap can of foam sealant at Bauhaus, fill the hole, and smooth the foam.
 
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