ᐅ OSB Boards for the Attic "Required," Yet Additional Charges?
Created on: 19 May 2016 14:56
T
tlactar
Hello,
we have recently started building (or rather having it built). Turnkey with an “all-inclusive price.”
Yesterday, the construction company called me and said: “We would now lift the OSB boards for the attic floor up to the roof structure for you. The boards cost about €580 for 40m² (430 ft²), and whether you install them yourself or not (980€ / about $1,080) is up to you.” ... okay? When I replied that I could get them significantly cheaper if I bought them myself, they said: “Alright, but these boards are included in the structural calculations, so please install them promptly.” ... o...k?
Now the question: is it really true that these boards are necessary? It seems odd to me... and if they are, shouldn’t they be included in the price? We had repeatedly asked beforehand if there might be any additional costs, but this was never mentioned. Is this even legal? Would they build us a structurally insufficient house without these boards?
we have recently started building (or rather having it built). Turnkey with an “all-inclusive price.”
Yesterday, the construction company called me and said: “We would now lift the OSB boards for the attic floor up to the roof structure for you. The boards cost about €580 for 40m² (430 ft²), and whether you install them yourself or not (980€ / about $1,080) is up to you.” ... okay? When I replied that I could get them significantly cheaper if I bought them myself, they said: “Alright, but these boards are included in the structural calculations, so please install them promptly.” ... o...k?
Now the question: is it really true that these boards are necessary? It seems odd to me... and if they are, shouldn’t they be included in the price? We had repeatedly asked beforehand if there might be any additional costs, but this was never mentioned. Is this even legal? Would they build us a structurally insufficient house without these boards?
Hi,
Well, a little workout is always nice...
If you bring them to the construction site, they can still be easily lifted up with the crane. But the timing has to be right.
Best regards,
Andreas
Caspar2020 schrieb:
You forget carrying them up one by one
Well, a little workout is always nice...
If you bring them to the construction site, they can still be easily lifted up with the crane. But the timing has to be right.
Best regards,
Andreas
40sqm (430 sq ft) roof area? What kind of doghouse is that? A 6 x 6.5 meter (20 x 21 feet) floor area?
If you plan to install flooring later anyway, you might be able to agree on a better price for it. Carrying the materials up yourself won’t be easy through the floor hatch. There is definitely a risk of bumping into something with the large, bulky parts and then regretting it. In the worst case, you could damage your brand-new staircase.
First, clarify exactly how many square meters there are and, if it is structurally necessary, insist that they do it. Otherwise, consider at least having it laid on.
PS: OSB boards need cross battens underneath for air circulation.
If you plan to install flooring later anyway, you might be able to agree on a better price for it. Carrying the materials up yourself won’t be easy through the floor hatch. There is definitely a risk of bumping into something with the large, bulky parts and then regretting it. In the worst case, you could damage your brand-new staircase.
First, clarify exactly how many square meters there are and, if it is structurally necessary, insist that they do it. Otherwise, consider at least having it laid on.
PS: OSB boards need cross battens underneath for air circulation.
Hi,
In a house with a concrete ceiling on the upper floor, the boards certainly don’t play a structural role; they simply rest loosely on the insulation. Normally, there shouldn’t even be joists for the OSB boards to rest on in that case.
In a house with a wooden ceiling on the upper floor, I also find it hard to believe, but it is still possible that the OSB layer could provide additional bracing for the roof structure—if the boards are properly screwed to every joist rather than just laid loosely. However, this is probably more of a theoretical consideration.
Best regards,
Andreas
Payday schrieb:
The question remains how OSB boards can actually contribute structurally, aside from requiring stronger joists to compensate (which means more weight) and is therefore only advantageous for the builder.
In a house with a concrete ceiling on the upper floor, the boards certainly don’t play a structural role; they simply rest loosely on the insulation. Normally, there shouldn’t even be joists for the OSB boards to rest on in that case.
In a house with a wooden ceiling on the upper floor, I also find it hard to believe, but it is still possible that the OSB layer could provide additional bracing for the roof structure—if the boards are properly screwed to every joist rather than just laid loosely. However, this is probably more of a theoretical consideration.
Best regards,
Andreas
C
Caspar202019 May 2016 15:26andimann schrieb:
In a house with a concrete ceiling on the upper floor, the boards definitely don’t matter, since they just lie loose on the insulation. There usually shouldn’t be any joists that the OSB boards rest on. Payday schrieb:
40 m² (430 sq ft) roof area? What kind of doghouse is that? A 6 x 6.5 meter (20 x 21 ft) house footprint?A typical one-and-a-half-story house with a 1 m (3 ft) knee wall still has a small attic floor. Usually, the attic ceiling is made of wood with insulation in between.
Hi,
Show-off, do you have more than 40 sqm (430 sq ft) of floor area? You’re such a wasteful person.
I think the OP will have a city villa-style roof similar to your house. And if you limit the OSB boards to the area where you can still reasonably move around (at least 1-1.2 m (3.3-4 feet) height), then that could fit.
Regards,
Andreas
Payday schrieb:
40 sqm (430 sq ft) roof area? What kind of doghouse is that? 6x6.5 meter (20x21 feet) house footprint?
Show-off, do you have more than 40 sqm (430 sq ft) of floor area? You’re such a wasteful person.
I think the OP will have a city villa-style roof similar to your house. And if you limit the OSB boards to the area where you can still reasonably move around (at least 1-1.2 m (3.3-4 feet) height), then that could fit.
Regards,
Andreas
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