Floorboard refurb are these boards too thin?

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Hiya,

Just looking for a second opinion, have a floor expert renewing our 100 year old floorboards, across a few rooms in 1st floor of our house. taking them up, repairing and relaying and then they will be sanded down. All going well but a lot of the old boards were split and so they’ve supplied a bunch of reclaimed boards to use on one bedroom. Popped around today and some boards are not screwed down yet and I lifted couple up and noticed that some of the thicknesses are only 13-15mm. They’ve also laid some old timbers across rock wool insulation which I guess is to add a bit of support but the insulation is suspended on chicken wire and there will be downlights below. It seems a bit suspect to me but would love a second opinion. If the boards were 18mm or 20mm like the original ones then they should be fine spanning the 500-600mm gap between joists. On e sanded down 13mm will become 11-12mm. Thanks in advance . Ps al the boards in this backroom photo are ones they supplied.
 

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Re-post it in a more appropriate forum but I wouldn't have boards that thin. 13mm is only good enough for cladding/furniture making IMHO, 600mm is a large span.
I guess they've found some reclaimed boards that are in such poor condition they've gone through the planer/thicknesser several times too many.
 
13mm is no good for a structural floor on 450mm centre joists.

it needs 20mm
 
also, might be more sensible to have them sanded before laying them - that will create a lot of dust.

I ordered new 20mm boards from my local timber merchants where I wasn't changing the whole floor. Obviously they don't look rustic, but they're under carpets in my house.

I assume you plan to keep the exposed floorboards? if covering with a carpet, then chipboard is quicker and cheaper!
 
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and so they’ve supplied a bunch of reclaimed boards to use on one bedroom.
If that 13 mm "board" is one of the re-claimed pieces of timber then reject it. It is plywood and if cut into plank sizes then it is totally un-suitable for flooring.
 
OP,
as above, the section size of 13mm is ridiculous.
typically, you replace individual boards but no need to be lifting whole floors which usually involves even more damage to even more boards unless the person doing it is experienced.
from what i can make out, you have T&G boards - with T&G there's no need for screwing down through the face of the boards.
as suggested above, the loose boards could have been belt sanded before laying, and then gone over with a light sander like the HSS Glide sanders.
the odd blocks of free floating wood are useless, they support nothing.
down lights need careful selection and installation.

good call bernardgreen - in section it sure looks like ply. and the nail head stains are too deep to be sanded out.
 

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