ᐅ Roof demolition of an old masonry barn

Created on: 23 Nov 2016 14:09
K
knallfrosch
K
knallfrosch
23 Nov 2016 14:09
Hello building professionals!
Next year, we will be converting an existing masonry barn into our new home.
To start with, we will be removing the roof ourselves. The roof structure is approximately 5m (16 feet) high, with base dimensions of 14 by 17m (46 by 56 feet). The roof construction consists of a fundamentally self-supporting, solid timber frame covered with old asbestos corrugated sheets. There is no insulation or similar.

My questions are the following:
  • What legal requirements do we need to consider besides the building permit/planning permission? In other words, besides proper disposal, are there specific regulations we must observe?
  • What safety precautions should we take? For example, would a suspended safety net be necessary due to the height, external scaffolding, etc.?
  • What additional equipment might we need besides an appropriate disposal vehicle and a crane? (We plan to store any timber that is still in good condition.)

I would really appreciate it if some of you could help answer a few of these questions.

Thank you very much in advance and best regards!
andimann23 Nov 2016 15:19
Hi,
without intending to offend you, but if you have to ask these kinds of questions:
knallfrosch schrieb:
What safety measures do we need to consider? For example, a tensioned safety net because of the height, external scaffolding, ...?


I strongly recommend getting professional assistance on site. What you’re planning is not a small task. You will be dealing with heavy loads and unpredictable behavior of beams. If a beam’s center of gravity is slightly different than you estimated, it will swing like a wrecking ball and destroy everything in its path.

I think this is one or two levels above what a “DIY group” should be taking on.

And ASBESTOS???
Pray that it’s not asbestos! If it is, good luck:
You have to remove it carefully wearing a full respirator suit, wrap it in plastic, and dispose of it as hazardous waste, which is very expensive. As far as I know, only certified companies are allowed to handle this!

This is about five to ten levels beyond what a “DIY group” should be handling.

Best regards,

Andreas
T
toxicmolotof
23 Nov 2016 15:30
I can only cover the cost of disposal, which varies widely across regions and seems very expensive. However, the material weighs almost nothing, and compared to the construction project, the asbestos disposal alone (excluding labor costs) will probably be cheaper than the notary fees for the mortgage.

At this scale, the weight is likely to be under 2t (2.2 tons).
andimann23 Nov 2016 15:40
Weighs almost nothing??

Maybe I’m totally missing something here. But when I think of those fiber cement corrugated sheets, I’d estimate them to be at least 15-25 kg per square meter (3-5 lbs per square foot). With an estimated roof area of roughly 300 square meters (3,230 square feet), you’re looking at around 6 tons (6,000 kilograms) to handle.

I don’t know what kind of breakfast you’re having, but if 6 tons (6,000 kilograms) is almost nothing to you, then I want some of that stuff too!

Best regards,

Andreas
T
toxicmolotof
23 Nov 2016 16:01
If you are more polite, I can gladly send you my weighing slip, which I used to dispose of the 48sqm (516 sqft) roof of an old garage.

And even if it is 6t (6.6 US tons).... Disposal costs here are 1,800 euros. I don’t think this project will fail because of that. There are other, much more important issues you mentioned.
andimann23 Nov 2016 16:11
Hi,
stay calm, have you already seen the smiley? Everything’s fine, it wasn’t meant to be rude at all. If it’s really only 1800 euros per ton, you’re right. Without knowing exactly what kind of material is involved, it’s pointless to speculate. I just keep thinking of the nursing home where I did my community service. They had “asbestos cement shingles” attached to the walls like slate tiles. They removed that stuff with the described extensive effort and corresponding financial cost. Apparently, it seriously affected the operator’s accounts for years!
Maybe disposing of these asbestos corrugated sheets is significantly cheaper. In any case, I would strictly follow all occupational safety regulations during disposal. Otherwise, you might not enjoy your new build for long.

Best regards,

Andreas