Door opening in load-bearing wall

2016-09-07 19:53:01

Hello,
a door is to be installed in a load-bearing interior wall (calcium silicate) in an older semi-detached house (built in 1976) (structural engineer approval obtained).
Questions:
1. Should the door opening be cut or chiseled? Disadvantage of cutting: considerable dust generation, as water cannot be used because there is parquet flooring on one side. Disadvantage of chiseling: vibrations? Unclean recess.
The work is to be carried out by a specialist company.
Which breakthrough method does the experienced builder recommend?

2. The ceiling must be secured with steel supports. Is damage to the parquet floor to be expected, even if the support rests on a thick wooden board? The parquet surface will generally be protected with boards in the demolition area.

Would be grateful for helpful advice.

A specialist company will be able to saw with water and also support without causing damage. Since I have practiced this profession myself, I know this. We have worked in completely different rooms without any damage.

2016-09-07 20:22:27

to : Sawing with water would of course be optimal. But how can the parquet floor in a room be protected during this?

to : I want to know the exact advantages and disadvantages myself before awarding the contract and avoid trouble, as subsequent scheduled work depends on it. Because even with professional companies, there have unfortunately already been botched jobs, and liability afterwards does me no good at all.

2016-09-07 20:57:04

But then have the companies describe to you how they intend to carry it out without damage - you can then evaluate that - more than suggestions we cannot make here either

2016-09-07 21:28:02

I believe you can also cut lime sand stones with a reciprocating saw. That could be an idea.

2016-09-07 22:07:46

Cutting with an angle grinder will create the most dust. If you have a good construction vacuum cleaner ready with someone else holding it, it goes surprisingly well. However, it should have a bit more power than a household vacuum cleaner.

I am not familiar with water, but it is probably the best option. Whether a professional company can do it without damage, I do not know. I think so; professional companies and their employees can generally be trusted since they usually deliver appropriate work. Damage is certainly not the norm.

Breaking through with a sledgehammer or rotary hammer or something similar will also be very dusty; one should not be fooled by that. From personal experience, I would say that a rotary hammer raises as much dust as an angle grinder with a suitable extractor.

2016-09-08 01:07:12

I can only say how we DID it and it worked perfectly. By the way, it was an 11.5 cm DF brick wall, so not these lightweight stones but solid stones comparable to calcium silicate bricks. And for a 24 cm wall, I would have cut from both sides. It gave a nice straight edge.

The vacuum cleaner was a Starmix ARH1635, so not a toy vacuum. The dust that was left was really minimal, especially considering how much dust there was when you emptied the vacuum.

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Door opening in load-bearing wall

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