ᐅ Ceiling to the attic floor – is wood or concrete more cost-effective?

Good morning,

I am currently gathering quotes for a two-family house (two living units stacked vertically). Five providers, 20 opinions. I was told that a concrete ceiling towards the (unheated) roof is cheaper than a timber construction?

Is this a price driver or is there some truth to it?

If the general contractor can cast the concrete ceiling themselves or use affordable precast slabs, it might be possible. Is the insulation the same? Who still builds with an unfinished attic today?

If the attic has a clear height of 1.7m (5.6 ft) at its highest point, it doesn’t make much sense to convert it.

My ceiling in concrete should cost 13,000 (thirteen thousand) more than the current timber structure. Even with the increases in wood prices, I cannot imagine it being cheaper in any way. That’s why I suspect he has deducted something else as well. He probably assumes that ceiling insulation can no longer be done with friction-fit insulation and must instead be provided on site.

Grundaus schrieb:

If the general contractor can pour the concrete slab themselves or use affordable precast slabs, it’s possible. Is the insulation the same? Who still builds with an unfinished attic today?

Thank you for the assessment. Having the general contractor do it themselves sounds plausible in this case.

Brücke239 schrieb:

I was told that a concrete ceiling towards the (cold) roof is cheaper than a wooden structure?
Is this a cost driver, or is there some truth to it?

Why "cost driver" – does the offer not actually include concrete, but wood as requested, and the provider just says, "If you had requested concrete, that would have been cheaper"?

Brücke239 schrieb:

I am currently collecting quotes for a two-family house (2 residential units stacked). Five providers, 20 opinions.

The less professional the tender, the bigger the differences in the responses (both in price and proposed solutions).

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11ant schrieb:

Why "price driver" – so the offer is not for concrete but for wood as requested, and the supplier only says, "if you had requested concrete, it would have been cheaper"?

The less professional the tender, the greater the gap in the responses (both in price and in the proposed solutions).

All good. So far, based on the plan, there has only been a preliminary discussion and the change was suggested.