How do I make a cutout for a door in a load-bearing wall?

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A door needs to be installed in a load-bearing interior wall (sand-lime brick) of an old two-family house (built in 1976) (positive test by a structural engineer).


1. Do I saw or cut in the doorway? Disadvantage of sawing: Significant accumulation of dust, as it is impossible to work with water, because one side of the parquet floor. Disadvantage of chiseling: Vibrations? Unclean grooving. The work should be done by a specialized company. What method of penetration is advised by an experienced builder?

2. The ceiling must be secured with steel supports. Should you expect damage to the parquet floor, even if the support is on a thick wooden plank? In the demolition area, the parquet surface is usually protected by planks.



A specialized company will do the sawing with water and reinforce it without causing any damage. I have worked in this profession myself, I know. We've worked in completely different rooms with no damage.


I can only tell you how we did it, and it turned out great. By the way, it was a DF 11.5mm brick wall, that is not these air stones, but hard stones comparable to KS. And with a 24mm wall I would have cut on both sides. there was a nice straight edge.

The vacuum was a starmix arh1635, so it wasn't a toy vacuum. The dust that was left was really minimal, especially when you saw how dusty the vacuum was when you emptied it.


I cut out a door in an old apartment I was renovating with a large 240 flex. It was a not load bearing wall, but I don't think that makes any difference. I handled it relatively cleanly with 2 measures.

1. I suspended the work area from the ceiling with 300m foil, which is nice, heavy, and stable.

2.A helper stood next to me with a large vacuum cleaner and vacuumed right at the flex. Of course it was a little dusty, but it was surprisingly humane.

As for floor damage, I would take thick paint fleece, 25mm osb board and a 20mm beam and spread the weight over a large area like you suggested, I think it should work.


Blasting ;-)

A specialized company will know what they are doing and will be held accountable when in doubt.


Let the companies describe to you how they're going to do it without causing any damage – then you can evaluate it – we can't do more than offer it here.


I think you can also cut limestone sandstones with a reciprocating saw. That might be an idea.


Bending through will create the most dust. If you have a good construction vacuum cleaner on hand and someone else has one at the ready, this goes surprisingly well.

It should have a little more steam than a household vacuum cleaner.

I don't know about water, but that's probably best. I don't know if a specialized company can do it without damage. I think yes, you can usually trust specialized companies and their employees because they usually do a good job.

Punching with a sledgehammer, hole punch or similar tool will also be very dusty, don't be fooled. From personal experience, I will say that a hammer drill picks up as much dust as a flex with a suitable extraction device.

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