Hi,

Some time ago we had vinyl flooring laid through our hallway.

It was recommended to us by the flooring contractor that we should have
hardboard laid first over the floorboards before the vinyl was glued
down on to it.
They were going to charge roughly £100 to do that, so we thought we'd do
it ourselves.
The sheets we laid were about 4 foot by 3 foot, so there were a few
joints, although they were flush with each other with no visible 'steps'
between boards.

However since then very slight 'creasing' has appeared where the
hardboard joints are. It's hardly noticeable except in certain lighting
conditions.

Anyway, we're now thinking of having the conservatory and kitchen/diner
floor covered in vinyl in the same way, and I was wondering if there is
a knack to laying the hardboard sheets so that the joints don't
eventually appear (even using larger sheets this time there'd still be a
few joints).

Also the conservatory floor is concrete, so how would I go about fixing
hardboard to this?

Thanks in advance,
Tony.