OSB or Ply for flat roof

[padstar]

Construction will be joists/18mm deck/130mm PIR/18mm Deck all fixed through to the joists at each layer.

Spoke to the roofer and he said he can do a single ply rubber roof as long as there is limited traffic up there. I only plan to be up there 1 time a year for maintenance so is this the better option?

 

[oldbutnotdead]

Construction will be joists/18mm deck/130mm PIR/18mm Deck all fixed through to the joists at each layer.

Spoke to the roofer and he said he can do a single ply rubber roof as long as there is limited traffic up there. I only plan to be up there 1 time a year for maintenance so is this the better option?

Yeah I'd go with it, your proposed insulation is the setup where many GRP roof owners have had noise problems.

 

[rideforever]

osb is total garbage as are fibreglass roofs ... if you have watched anybody installing one you realise its a cheapo diy product that is now sold for high price ... osb crumbles in your hands how can it be a good roof covering? It is made super cheap to appeal to contractors who make a cut on the boards.
Anyway best is probably half ply half osb if you are doing fibreglass.
But there are better coverings.

 

[HERTS P&D]

Only 5 years too late.

Andy

 

[noseall]

Only 5 years too late.

Andy

If they went with GRP, it might need replacing by now...